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What Emerging Research Reveals About the Gut, Cellular Health, Fatty Acids, Nutrition, Exercise, and the Brain

First, thank you for taking the time to read this article.

Whether you’re completely new to Parkinson’s disease, you’ve recently been diagnosed, someone you love is living with Parkinson’s, or you’ve been familiar with this disease for years, I believe you’re going to learn something new.

And I want to ask you to do one thing as you read:

Keep an open mind.

Some of what you’re about to learn may surprise you.

There may even be moments when you stop and ask yourself:

“Why am I just now learning about this?”

That’s understandable, because much of the public conversation about Parkinson’s focuses on what happens after the classic symptoms appear—tremors, stiffness, slowed movement, problems with balance, and changes in walking.

Those things are extremely important.

But they aren’t the entire story.

What if some of the most important changes associated with Parkinson’s begin years before the first tremor?

What if the story involves more than dopamine?

What if we also need to be talking about the gut, mitochondria, inflammation, oxidative stress, cellular membranes, fatty acids, and a protein called alpha-synuclein?

And what if there are things happening at the cellular level that most people have never been taught to think about?

That’s where we’re going.

But I also want to make something clear from the beginning:

This article isn’t only about what may happen before Parkinson’s develops or what researchers believe may contribute to the disease.

If you are already living with Parkinson’s disease, there is information here for you too.

We’re going to look at research involving people who already have Parkinson’s and explore what studies have found about omega-3 fatty acids, nutrition, exercise, depression, inflammation, oxidative stress, metabolic health, and other areas that may be relevant to supporting overall health after a Parkinson’s diagnosis.

Most importantly, we’re going to talk about something I believe should become a much bigger part of the nutrition conversation:

measurement.

Because whether you’re trying to be proactive about your long-term health or you’re already living with Parkinson’s, I don’t believe we should simply tell people:

“Take fish oil.”

I want to know:

Is what you’re taking actually changing your fatty-acid status?

Can we measure the difference?

Can we establish a baseline, make an intervention, and then test again?

Because taking a supplement and knowing that it measurably changed your biology are two very different things.

And as you’ll see later in this article, some Parkinson’s researchers have actually measured fatty acids in red blood cell membranes after omega-3 supplementation.

That’s important.

So this article is really about both sides of the conversation:

What might be happening before Parkinson’s becomes obvious?

and

If you already have Parkinson’s, what can you do to better support your overall health and measure some of the things you’re trying to change?

We’re going to talk about why constipation and certain sleep disturbances can sometimes appear years before the classic movement symptoms of Parkinson’s.

We’re going to explore the growing scientific interest in the gut-brain connection.

We’re going to look at mitochondria and what happens when the cell’s energy-producing machinery begins struggling.

We’re going to talk about inflammation—and why inflammation itself isn’t always the enemy.

We’re going to explore alpha-synuclein and why researchers are so interested in its relationship with fats and cellular membranes.

And we’re going to spend some time talking about something I believe deserves far more attention:

cell-membrane health and membrane fluidity.

Because here’s something I want you thinking about from the very beginning:

Every organ in your body is made of cells.

Your brain is made of cells.

Your neurons are cells.

And every one of those cells depends on functioning cellular membranes.

We’re also going to explore something most people have probably never measured:

their cellular fatty-acid balance.

Later in this article, I’m going to introduce you to an At-Home Cellular Health Test that can provide information about your fatty-acid status, including eicosapentaenoic acid (EPA), docosahexaenoic acid (DHA), arachidonic acid (AA), your omega-6-to-omega-3 ratio, and your Omega-3 Index.

I’ll also share why this subject became personal for me more than two decades ago—and why discovering this type of testing about three years ago changed the way I think about optimizing health.

And there is a reason all of this belongs in a conversation about Parkinson’s.

In 2025, researchers Saranna Fanning and Dennis Selkoe published a provocative scientific perspective in Nature Reviews Neurology titled “Parkinson disease is a fatty acidopathy.” They proposed that disturbances in fatty-acid homeostasis may be an important part of Parkinson’s biology.[1]

Think about that.

For decades, the public conversation surrounding Parkinson’s has centered largely on dopamine and the loss of dopamine-producing neurons.

Those things remain critically important.

But researchers are also investigating fatty acids, lipids, cellular membranes, mitochondria, oxidative stress, inflammation, the gut, and their relationship with alpha-synuclein, the protein strongly associated with Parkinson’s pathology.

So as you read, keep asking questions.

Stay curious.

And most importantly, keep an open mind.

Because by the time you reach the end of this article, my hope is that you’ll understand Parkinson’s—and the cellular environment surrounding it—from a perspective you may never have considered before.

And if you’re already living with Parkinson’s, my hope is that you’ll also come away with a better understanding of some of the areas of your health you can discuss with your healthcare team, support through nutrition and lifestyle, and—in some cases—actually measure.

Let’s start putting the pieces together.

Parkinson’s Disease Is More Than a Tremor

Parkinson’s disease is a progressive neurological disorder involving both motor and non-motor symptoms.

Tremor may be one of its most recognizable manifestations, but Parkinson’s can also involve slowed movement, muscle rigidity, balance difficulties, changes in walking, speech problems, sleep disturbances, constipation, depression, cognitive changes, loss of smell, fatigue, and disturbances of the autonomic nervous system.[2]

That tells us something important:

Parkinson’s isn’t simply a disease of movement.

Movement problems may eventually bring someone into a doctor’s office, but the underlying biology is considerably more complicated.

What Is Happening Inside the Parkinson’s Brain?

Deep inside the brain is an area called the substantia nigra (a small region of the brain containing many of the dopamine-producing neurons involved in controlling movement).

Certain neurons within this region produce dopamine, a chemical messenger that plays an essential role in controlling movement.

In Parkinson’s disease, these dopamine-producing neurons progressively become dysfunctional and die. As dopamine availability decreases, communication within the brain circuits controlling movement becomes impaired.[2]

This helps explain the slowed movement, stiffness, tremor, balance problems, and other motor symptoms associated with Parkinson’s.

But simply saying Parkinson’s involves low dopamine misses a much bigger question:

Why are those neurons becoming dysfunctional and dying in the first place?

Researchers are investigating several interacting mechanisms, including alpha-synuclein abnormalities, mitochondrial dysfunction, oxidative stress, neuroinflammation, genetics, environmental exposures, and increasingly, disturbances involving lipids and fatty-acid metabolism.[1,3]

That’s where the story becomes much bigger.

Parkinson’s May Begin Long Before the Tremor

One of the most important things I want you to understand is that Parkinson’s disease can have a long prodromal phase (the period when early changes or symptoms may appear before the classic signs of the disease become obvious enough for diagnosis).

In other words, biological processes associated with Parkinson’s may be developing years before someone develops the movement symptoms most people associate with the disease.

Some people who eventually develop Parkinson’s experience non-motor abnormalities years before their classic movement symptoms.[4]

Among the potential early clues are constipation, reduced sense of smell, rapid eye movement (REM) sleep behavior disorder, autonomic dysfunction, and mood changes.

REM sleep behavior disorder is particularly interesting.

During normal REM sleep, the brain temporarily suppresses most skeletal-muscle movement.

In REM sleep behavior disorder, this suppression is impaired. People may physically act out their dreams by kicking, punching, shouting, or moving while asleep.

REM sleep behavior disorder is strongly associated with alpha-synuclein disorders and can precede clinically diagnosed Parkinson’s.[4]

Then there is constipation.

Constipation seems like something that should have very little to do with a neurological disease.

But that assumption is exactly why the next part of the story is so interesting.

Why Are Parkinson’s Researchers Looking at the Gut?

Your digestive system and brain are constantly communicating.

This network is commonly called the gut-brain axis.

The gut has its own extensive nervous system—the enteric nervous system—and communicates with the brain through neural, hormonal, metabolic, and immune pathways.

The vagus nerve provides one important communication route between the gastrointestinal system and brain.

Researchers have documented differences in the gut microbiome of people with Parkinson’s and are investigating whether changes involving intestinal permeability, microbial metabolites, gastrointestinal inflammation, and alpha-synuclein may participate in the disease process.[5,6]

This has contributed to a fascinating concept sometimes called the gut-first or body-first hypothesis of Parkinson’s.

In this model, abnormal alpha-synuclein biology may initially develop in parts of the peripheral nervous system—including the gastrointestinal nervous system—and subsequently influence the central nervous system (CNS) through interconnected neural pathways.[5]

Research also suggests Parkinson’s may not follow exactly the same pathway in everyone. Some researchers distinguish possible body-first and brain-first patterns.[5,6]

That represents an important shift in thinking.

The question is no longer only:

What is happening inside the brain?

Researchers are increasingly asking:

What might have been happening throughout the body before the classic neurological symptoms appeared?

And that brings us to alpha-synuclein.

Alpha-Synuclein: A Normal Protein That Can Begin Behaving Abnormally

Before we talk about what can go wrong with alpha-synuclein, let’s make something very clear:

Your body is supposed to make alpha-synuclein.

Alpha-synuclein isn’t some foreign substance that suddenly appears in people with Parkinson’s.

It is a naturally occurring protein produced by our own cells and is especially abundant in neurons.

And like other proteins in the body, alpha-synuclein is built from amino acids.

If you think about proteins such as keratin—the structural protein found in hair, skin, and nails—the basic principle is similar.

Proteins are constructed from amino acids arranged in specific sequences.

Alpha-synuclein is a relatively small protein consisting of 140 amino acids.

The SNCA gene contains the genetic instructions used by cells to produce it.

Here’s an easy way to think about it:

AMINO ACIDS → GENETIC INSTRUCTIONS → ALPHA-SYNUCLEIN PROTEIN

Or think about building something with LEGO pieces.

The individual amino acids are the LEGO pieces.

Your genes contain the instructions.

The cell’s protein-making machinery follows those instructions and connects the amino acids in the correct order.

The finished creation is the protein.

Under normal conditions, alpha-synuclein appears to participate in processes around the synapse—the location where one neuron communicates with another—including the handling of tiny membrane-bound structures called synaptic vesicles.

So the problem isn’t simply:

“The body makes alpha-synuclein.”

It’s supposed to.

The more important question in Parkinson’s is:

What causes or contributes to this normally occurring protein beginning to behave abnormally?

Alpha-synuclein can change shape, misfold, and aggregate.

Larger accumulations of alpha-synuclein are associated with Lewy bodies, one of the classic pathological features associated with Parkinson’s.

Here’s another simple analogy.

Imagine folding clothes and placing them neatly into a drawer.

Fold everything correctly and the drawer functions normally.

But imagine clothes being folded incorrectly, sticking together, and accumulating into increasingly disorganized piles.

Eventually, the drawer doesn’t function as well.

Protein biology is considerably more complicated, but the analogy helps explain why folding and organization matter.

And this raises another important nutrition question.

Does someone simply need to eat more protein or more amino acids to prevent alpha-synuclein from misfolding?

That’s not what the evidence suggests.

A person needs adequate protein and essential amino acids for normal protein synthesis throughout the body. But Parkinson’s isn’t generally viewed as a disease caused by running out of the amino acids needed to manufacture alpha-synuclein.

The more interesting scientific question is what happens after and while the protein is being produced:

How does it fold?

How does it interact with membranes?

How is damaged or abnormal protein cleared?

How does oxidative stress affect it?

What happens when mitochondria become dysfunctional?

How does inflammation affect the cellular environment?

And what role do fatty acids and cellular membranes play?

That’s where this becomes particularly relevant to our discussion.

Alpha-synuclein naturally interacts with lipid membranes.

Research suggests the fatty-acid composition and physical characteristics of those membranes can influence alpha-synuclein’s behavior.[1,7]

So we begin to see a relationship:

FATTY ACIDS ↔ CELL MEMBRANES ↔ ALPHA-SYNUCLEIN

Keep that relationship in mind.

It becomes increasingly important as we continue.

Mitochondria: When the Neuron’s Power System Struggles

Inside most of your cells are structures called mitochondria.

You’ve probably heard mitochondria described as the “powerhouses of the cell.”

Their job is more complicated than that, but the analogy is useful because mitochondria are responsible for producing much of the usable energy required by our cells.

Neurons have enormous energy requirements.

They must maintain electrical activity.

They must transport materials over long distances.

They must communicate with other neurons.

They must maintain ion gradients.

They must manufacture, recycle, and release neurotransmitters.

And they must continuously repair and maintain themselves.

All of this requires energy.

Mitochondrial dysfunction has long been implicated in Parkinson’s disease.[3]

When mitochondria become dysfunctional, cells may produce energy less efficiently while generating greater oxidative stress.

But there is another connection I don’t want you to miss.

The Cell Membrane and Mitochondria Are Part of the Same Cellular Story

Mitochondria don’t operate in isolation.

Before a cell can use many nutrients, those nutrients first have to interact with the cellular environment.

And standing between the inside of the cell and the outside world is the cell membrane.

The membrane is both protective and selective.

It doesn’t simply allow everything to pass through.

Embedded within the membrane are proteins, receptors, channels, and transporters that help regulate what enters the cell, what leaves the cell, and how the cell responds to signals from its environment.

Think about glucose.

Think about amino acids.

Think about minerals and electrolytes.

Think about hormones communicating with receptors on the surface of cells.

All of these processes depend, in different ways, on properly functioning cellular membranes and membrane-associated proteins.

Oxygen is somewhat different because this small molecule can diffuse across cellular membranes. But ultimately, oxygen and nutrients must become available to the cellular machinery that uses them to produce energy.

And here’s something even more fascinating:

Mitochondria have membranes too.

Every mitochondrion has an outer membrane and a highly specialized inner mitochondrial membrane.

That inner membrane contains some of the most important energy-producing machinery in the body.

The electron transport chain is located there.

ATP synthase is located there.

This is where the final stages of oxidative phosphorylation generate adenosine triphosphate (ATP)—the molecule cells use as an immediate source of energy.

So when we talk about cellular energy, we’re also talking about membrane biology.

Think about the sequence:

CELLULAR ENVIRONMENT → CELL MEMBRANE → NUTRIENT TRANSPORT & SIGNALING → CELLULAR METABOLISM → MITOCHONDRIA → ATP

And after cells perform their work, they must transport substances, recycle cellular components, maintain ion gradients, and manage metabolic products.

Membranes and membrane-associated proteins participate throughout those processes.

That’s why the cell membrane isn’t simply wrapping around the cell.

It is an active participant in how the cell interacts with its environment.

And inside that cell, mitochondrial membranes are fundamental to energy production.

For neurons—with their enormous and continuous energy requirements—this relationship becomes particularly important.

Oxidative Stress: When Cellular Wear and Tear Begins Winning

Our bodies naturally generate reactive molecules during normal metabolism.

That’s not automatically bad.

We also possess antioxidant defense systems that help control these molecules.

The problem occurs when the production of reactive molecules overwhelms the systems responsible for controlling them.

That’s oxidative stress.

And here’s where several pieces of our story begin connecting.

Mitochondrial dysfunction can contribute to oxidative stress.

Oxidative stress can damage proteins.

It can damage cellular structures.

And it can damage lipids—including the polyunsaturated fatty acids found within cellular membranes.

This process is called lipid peroxidation.

Research has shown that products generated during lipid peroxidation can interact with alpha-synuclein and influence its aggregation.[8]

Now look at how the pieces begin connecting:

MITOCHONDRIA → OXIDATIVE STRESS → LIPID DAMAGE → CELL MEMBRANES → ALPHA-SYNUCLEIN

Again, biology isn’t a simple one-way chain.

These systems influence one another.

But that’s exactly why looking at Parkinson’s exclusively through the lens of dopamine may leave out important pieces of the biological story.

Inflammation Isn’t Always the Enemy

We also need to clarify something about inflammation.

Inflammation is not automatically bad.

Inflammation is part of your body’s defense and repair system.

Cut your finger, fight an infection, or injure a muscle, and an appropriate inflammatory response helps protect and repair you.

You want inflammation to turn on when it is needed.

But you also want that inflammatory response to resolve appropriately when its job is finished.

Problems can develop when inflammatory signaling becomes chronic or poorly regulated.

Inside the brain, specialized immune cells called microglia participate in immune surveillance and inflammatory responses.

Persistent neuroinflammatory signaling is one of the processes being studied in Parkinson’s disease.[3]

And once again, these pathways don’t operate independently.

Alpha-synuclein abnormalities can influence inflammation.

Mitochondrial dysfunction can increase oxidative stress.

Oxidative stress can damage lipids and proteins.

Inflammatory signaling can influence neuronal function.

This is a network.

And that network brings us back to something surrounding virtually every cell in your body.

The Cell Membrane: One of the Most Overlooked Parts of Health

Every cell in your body is surrounded by a membrane.

But don’t picture a plastic bag wrapped around a cell.

The cell membrane is alive with activity.

It contains receptors.

It contains proteins.

It contains transporters and channels.

It helps regulate what moves into and out of cells.

It participates in signaling.

It helps cells communicate.

And the types of fats incorporated into those membranes matter.

This is where nutrition becomes especially interesting.

Some of the fats we consume can eventually become incorporated into cellular membranes.

Think about what that means:

The food we eat can actually help provide some of the building materials from which our cells are constructed.

Nutrition doesn’t just protect the cell.

Nutrition helps build the cell.

And when we’re talking about Parkinson’s, we’re talking about neurons.

Neurons are cells.

Their membranes are essential to electrical signaling, receptor function, neurotransmission, and communication.

This is where we need to talk about cell-membrane fluidity.

Why Wouldn’t We Pay Attention to Cell-Membrane Fluidity?

This may be one of the most important concepts in this article.

Cell membranes aren’t supposed to be completely rigid.

And they aren’t supposed to behave like water.

They require an appropriate degree of fluidity.

Think of the membrane as a busy harbor.

There are gates.

There are docking stations.

There are communication systems.

There are workers moving materials in and out.

There are signals arriving and departing.

The harbor can’t function properly if everything is frozen solid.

But it wouldn’t function properly if the docks had no structure at all, either.

The same basic principle applies to cellular membranes.

A healthy membrane requires the appropriate physical environment for its receptors, proteins, transporters, channels, enzymes, and signaling systems to function.

That is why I don’t look at membrane fluidity as some obscure scientific concept.

It is fundamental cell biology.

Appropriate membrane properties support processes such as receptor function, cellular signaling, nutrient and molecule transport, ion-channel activity, membrane-protein movement, vesicle formation and fusion, and communication between cells.

And nowhere is cellular communication more important than in the nervous system.

A neuron communicates using electrical and chemical signals.

Neurotransmitters must be packaged into tiny membrane-bound structures called vesicles.

Those vesicles must move.

They must interact with cellular membranes.

They must release their contents.

Receptors on neighboring cells must receive signals.

Membrane biology is woven throughout that entire process.

And now remember what we learned about alpha-synuclein.

Alpha-synuclein normally interacts with these lipid membranes and synaptic vesicles.

The 2025 Nature Reviews Neurology paper we’re discussing highlights alpha-synuclein’s interaction with fatty-acid-containing membranes and proposes that disturbances in this relationship may be important in Parkinson’s biology.[1]

So here’s a question I believe deserves much more attention:

If healthy cell-membrane function and appropriate membrane fluidity are fundamental to how our cells communicate, transport substances, receive signals, and perform their normal functions, why wouldn’t we want to know more about the fatty-acid environment influencing those membranes?

That doesn’t mean more fluidity is always better.

Biology rarely works that way.

The goal is appropriate membrane fluidity and healthy membrane function.

And fatty-acid composition is one factor influencing those membrane properties.

What If Parkinson’s Is Also a Lipid Story?

When most people hear the word fat, they think about body fat, cholesterol, heart disease, or weight gain.

But fats also help build us.

Our brains are extraordinarily lipid-rich organs.

Lipids help form neuronal membranes, participate in cellular signaling, influence membrane properties, and interact with proteins.

Researchers have spent years investigating the relationship between alpha-synuclein and lipids.

Then, in 2025, Fanning and Selkoe took the argument considerably further.

Writing in Nature Reviews Neurology, they proposed that Parkinson’s disease could be considered a “fatty acidopathy”—a disorder in which disturbances of fatty-acid homeostasis may be intertwined with the better-known abnormalities involving alpha-synuclein.[1]

Think about the significance of that.

For decades, most people have heard Parkinson’s discussed primarily as:

DOPAMINE → NEURONS → MOVEMENT

But researchers are increasingly examining another interconnected biological story:

FATTY ACIDS ↔ CELLULAR MEMBRANES ↔ ALPHA-SYNUCLEIN ↔ MITOCHONDRIA ↔ OXIDATIVE STRESS ↔ NEURONAL FUNCTION

I deliberately used arrows going in both directions.

Why?

Because these biological processes don’t necessarily operate as a simple one-way chain.

They can influence one another.

This doesn’t establish that an altered fatty-acid profile causes Parkinson’s disease.

But it does tell us something important:

Fatty-acid and membrane biology deserve serious scientific attention.

Fanning and Selkoe reviewed evidence supporting physiological and pathological interplay between alpha-synuclein and fatty acids. They specifically noted that alpha-synuclein homeostasis can be affected by membrane fatty-acid composition and that dysregulated fatty-acid metabolism can alter alpha-synuclein membrane binding.[1]

That’s an extraordinary connection.

The Simopoulos Connection: Did Our Fatty-Acid Environment Change Faster Than Our Genes?

This brings us to the work of Artemis P. Simopoulos, M.D.

Dr. Simopoulos has spent decades researching the relationship between omega-6 and omega-3 fatty acids, evolution, genetics, and chronic disease.

Her work highlights a striking nutritional change.

Humans are believed to have evolved consuming omega-6 and omega-3 fatty acids in a much closer balance than is typical today.

Simopoulos estimated an evolutionary dietary omega-6-to-omega-3 ratio near 1:1, while describing modern Western dietary ratios ranging approximately from 10:1 to 20–25:1.[9]

Think about that.

Our genes did not suddenly change when our food environment changed.

But our dietary fatty-acid environment changed substantially.

This raises an important question:

Did our fatty-acid environment change faster than our biology could adapt?

Omega-6 and omega-3 fatty acids aren’t simply calories.

They can become incorporated into cellular structures.

They participate in signaling.

They serve as precursors for families of bioactive molecules.

They participate in inflammatory and inflammation-resolving pathways.

And they play important roles in the nervous system.

This isn’t about saying:

Omega-6 = bad. Omega-3 = good.

That’s far too simplistic.

Both are essential.

The more meaningful conversation involves balance, metabolism, membrane incorporation, oxidation, genetics, and the signaling molecules derived from these fatty acids.

DHA, EPA, AA, and Your Cells

Earlier, I introduced three fatty acids that deserve particular attention:

EPA, DHA, and AA.

EPA and DHA are long-chain omega-3 fatty acids.

AA is a long-chain omega-6 fatty acid.

DHA is especially abundant in the brain and is an important structural component of neuronal membranes.

AA is also an important membrane component and participates in numerous signaling pathways.

These fatty acids can influence membrane properties and provide substrates from which the body produces bioactive signaling molecules.

But there is another layer.

Highly unsaturated fatty acids are susceptible to lipid peroxidation—oxidative damage to fats.

Research has linked products of lipid peroxidation with alpha-synuclein modification and aggregation.[8]

So again we see the relationship:

FATTY ACIDS ↔ CELL MEMBRANES ↔ ALPHA-SYNUCLEIN

with mitochondria, oxidative stress, and inflammatory signaling interacting within the same biological environment.

Taking Fish Oil and Knowing It’s Working Are Two Different Things

At this point you may be wondering:

Haven’t researchers already studied omega-3 supplements and fish oil in Parkinson’s disease?

Yes.

Omega-3 fatty acids and fish oil have been investigated in people living with Parkinson’s, including research examining depression and other clinical and metabolic outcomes.[10]

But I want you to understand something that I believe is extremely important when interpreting nutritional research—and when making decisions about your own nutrition.

Taking an omega-3 supplement and knowing what happened inside your body are two different things.

Giving someone a certain amount of fish oil tells us what they were instructed to consume.

But that alone doesn’t necessarily tell us:

What was their fatty-acid status before they started?

What happened to their EPA?

What happened to their DHA?

What happened to their Omega-3 Index?

What happened to their overall fatty-acid profile?

What happened to their omega-6-to-omega-3 balance?

Those are different questions.

This Is Why Testing Changes the Conversation

Imagine two people taking exactly the same fish-oil supplement every day.

Same product.

Same dose.

Same number of capsules.

Same length of time.

Should we automatically assume their blood fatty-acid profiles will become identical?

No.

Controlled research has demonstrated substantial person-to-person variability in the red-blood-cell response to EPA and DHA supplementation.[11]

Dose matters.

Baseline Omega-3 Index matters.

Body weight can matter.

Age, sex, physical activity, and other individual characteristics can contribute to the response.[11]

This is why I don’t believe the most useful question is simply:

“Do you take fish oil?”

I want to know:

“What happened when you took it?”

Did your EPA increase?

Did your DHA increase?

What happened to your Omega-3 Index?

What happened to your omega-6-to-omega-3 ratio?

Show me the test.

Interestingly, One Parkinson’s Study Did Test the Red Blood Cells

This is where the Parkinson’s research becomes especially interesting.

In a double-blind, randomized, placebo-controlled pilot study involving people with Parkinson’s disease and major depression, researchers gave participants fish oil or placebo capsules for approximately three months.[10]

The researchers didn’t simply hand participants fish oil and assume it was changing their fatty-acid status.

They analyzed the fatty-acid composition of their erythrocyte membranes—red blood cell membranes.

 

And what did they find?

The participants receiving fish oil demonstrated an increase in omega-3 fatty acids in their erythrocyte membranes.[10]

The study also reported improvement on certain measures of depressive symptoms, although it was a small pilot study and the researchers appropriately called for larger studies.[10]

But I want you to notice something about this study that I find especially important.

They measured the red blood cells.

They had biological evidence that omega-3 fatty acids had actually increased in the erythrocyte membranes of participants receiving fish oil.

They didn’t have to assume it.

They measured it.

That distinction is extremely important.

What If You Already Have Parkinson’s?

Now let’s speak directly to the person who has already received the diagnosis.

You may be thinking:

“This is fascinating, but what does any of this mean for me? I already have Parkinson’s.”

That’s an important question.

A Parkinson’s diagnosis doesn’t suddenly make nutrition irrelevant.

It doesn’t make exercise irrelevant.

It doesn’t make sleep irrelevant.

It doesn’t make cardiovascular health irrelevant.

It doesn’t make metabolic health irrelevant.

And it certainly doesn’t make cellular health irrelevant.

Human studies have already investigated omega-3-containing interventions in people living with Parkinson’s.

The evidence remains limited and doesn’t establish that omega-3 supplementation cures, reverses, or definitively slows Parkinson’s disease.

But there are signals worth studying further.

The fish-oil trial we just discussed is one example.

People with Parkinson’s and major depression who received fish oil experienced improvement on certain depression measures, while testing confirmed an increase in omega-3 fatty acids within their red blood cell membranes.[10]

Other trials have investigated omega-3-containing interventions and reported changes in Parkinson’s symptom scores and biomarkers involving inflammation, antioxidant defenses, and metabolic health, although some interventions combined omega-3s with other nutrients, making it impossible to attribute the results to omega-3s alone.

That’s why I don’t want someone reading this article and walking away thinking:

“Robert told me fish oil treats Parkinson’s.”

That’s not what I’m saying.

I’m asking a different question:

If you’re living with Parkinson’s, what can you do to optimize the nutritional, metabolic, physical, and cellular environment in which your body and brain must function?

That’s a very different conversation.

And if you and your healthcare team decide that increasing omega-3 intake is appropriate, I believe another question deserves to follow:

Did it measurably change your fatty-acid status?

That’s something we can actually investigate.

This Is Bigger Than Choosing a Bottle of Fish Oil

People sometimes ask me:

“What’s the best fish oil?”

Quality matters.

The amount of EPA and DHA matters.

The form of the oil can matter.

Purity matters.

Oxidative stability matters.

Manufacturing and storage matter.

But ultimately, there is another question that matters tremendously:

Is what you’re taking actually changing your fatty-acid status in the direction you’re trying to achieve?

A beautiful label can’t answer that.

The price of the bottle can’t answer that.

A celebrity endorsement can’t answer that.

And even the number of milligrams printed on the label doesn’t tell you what ultimately happened inside your body.

Your biology can help answer that.

This is why testing before and after a nutritional intervention can be so informative.

Establish a baseline.

Make your nutritional changes.

Allow sufficient time for those changes to become reflected in your red blood cells.

Then test again.

Now the conversation changes from:

“I think it’s working.”

to:

“Let’s see what changed.”

Nutrition: Food Is Information—and Building Material

If the gut, mitochondria, oxidative stress, inflammation, cellular membranes, and lipid metabolism are relevant to Parkinson’s research, nutrition becomes difficult to ignore.

Food does much more than provide calories.

Food provides amino acids.

Food provides fatty acids.

Food provides vitamins and minerals.

Food provides fiber.

Food provides polyphenols and thousands of other compounds.

And some of what we eat ultimately becomes part of our tissues and cellular structures.

Remember our discussion about alpha-synuclein.

Your body needs amino acids to manufacture proteins.

That doesn’t mean eating more protein prevents alpha-synuclein from misfolding.

But it reminds us of something fundamental:

Nutrition supplies the raw materials the body uses to build, maintain, repair, and operate itself.

Diet also influences the gut microbiome.

That creates another fascinating pathway:

FOOD → GUT MICROBIOME → MICROBIAL METABOLITES → IMMUNE SIGNALING → GUT-BRAIN COMMUNICATION

Mediterranean-style dietary patterns have attracted particular interest in Parkinson’s research.

These dietary patterns generally emphasize vegetables, fruits, legumes, nuts, seeds, whole grains, fish, olive oil, and minimally processed foods.

Rather than searching for a single Parkinson’s “superfood,” the larger goal is to create a nutritional environment supportive of metabolic, cardiovascular, gastrointestinal, cellular, and brain health.

For people taking levodopa, protein timing can also become relevant because certain amino acids and levodopa use some of the same transport systems.

This does not mean people with Parkinson’s should indiscriminately restrict protein.

Rather, medication timing and adequate nutrition may need to be individualized with the healthcare team.

Exercise May Be One of the Most Powerful Tools We Already Have

Nutrition is only one part of the picture.

Movement matters.

Exercise is increasingly recognized as an important component of Parkinson’s management.

Depending on an individual’s abilities, programs may incorporate aerobic exercise, resistance training, walking, cycling, balance training, dancing, aquatic exercise, and other activities.

Exercise can support strength, cardiovascular fitness, mobility, balance, and quality of life.

But there is one type of exercise that has attracted considerable attention in the Parkinson’s community:

boxing.

Why Are People With Parkinson’s Putting on Boxing Gloves?

Picture what happens during non-contact boxing training.

Someone sees or hears a cue.

The brain processes it.

The person shifts their weight.

Moves their feet.

Maintains balance.

Rotates their trunk.

Coordinates their hands and eyes.

Throws a punch.

Returns to position.

Then reacts to another cue.

In other words:

SEE → PROCESS → MOVE → BALANCE → COORDINATE → REACT → REPEAT

Now think about Parkinson’s.

This is a disease that can affect movement initiation, coordination, gait, posture, balance, reaction, and motor control.

Suddenly boxing doesn’t sound so strange.

A 2025 systematic review examined 13 studies involving 402 people with Parkinson’s, ranging in age from 53 to 89 years.[12]

Researchers reported moderate-quality evidence suggesting potential improvements in lower-extremity strength, balance, mobility, gait, depression, quality of life, disease severity, exercise safety, and adherence.[12]

Boxing combines multiple demands:

AEROBIC EXERCISE + STRENGTH + BALANCE + AGILITY + COORDINATION + COGNITIVE PROCESSING

Other analyses have been more cautious about several outcomes, so boxing shouldn’t be presented as a treatment that has been proven to slow neurodegeneration.

But it provides a fascinating example of an activity simultaneously challenging the body and brain.

Genes Matter—but Genes Aren’t the Entire Story

Genetics contribute to Parkinson’s.

Certain genetic variants can substantially increase susceptibility, while most Parkinson’s cases appear to involve more complicated interactions among aging, genetics, and environmental factors.[2]

Environmental exposures, including certain pesticides, have also been studied.

This is why the old question:

“Is it genetic or environmental?”

may be too simplistic.

A better question is:

How are our genes interacting with the environment in which they are operating?

Nutrition is part of that environment.

Physical activity is part of that environment.

Environmental exposures are part of that environment.

Metabolic health is part of that environment.

Genes matter.

But genes do not operate in isolation.

The At-Home Cellular Health Test: The Test That Changed How I Look at Health

Before I explain this test, I want to share a little of my own journey because my interest in omega-3 fatty acids didn’t begin yesterday.

It goes back more than two decades.

In 2002, I had an opportunity to meet Andrew Weil, M.D.

During our conversation, he said something to me that I have never forgotten:

“You can’t be in optimum health if you don’t get enough omega-3s. And most of us are not getting enough.”

That statement stayed with me.

But there was still a problem.

How do you know if you’re getting enough?

You can ask someone how much fish they eat.

You can ask whether they take fish oil.

You can ask how many milligrams they consume.

But those questions still don’t tell you what is actually showing up in their blood.

Then something important happened.

In 2004, researchers William S. Harris, Ph.D., and Clemens von Schacky, M.D., formally proposed what they called the Omega-3 Index.[13]

Rather than simply estimating omega-3 intake, the concept was to measure EPA and DHA in red blood cells and express their combined amount as a percentage of total fatty acids.[13]

In other words:

Don’t just ask what someone is eating. Measure what is actually there.

The Omega-3 Index was initially proposed in relation to cardiovascular risk.[13]

But the larger concept fascinated me:

measure instead of assuming.

Then I Was Introduced to a Test That Changed Everything for Me

About three years ago, I was introduced to an At-Home Cellular Health Test that went beyond simply asking how much omega-3 someone consumed.

With a small dried blood spot collected from the fingertip, I could obtain information about a person’s fatty-acid status, including two measurements I consider extremely valuable:

their omega-6-to-omega-3 ratio and their Omega-3 Index.

For me, that changed the conversation about optimizing health.

Why?

Because now we weren’t simply talking about what someone thought they were doing nutritionally.

We could measure it.

Someone could tell me:

“I eat salmon.”

“I take fish oil.”

“I eat healthy.”

“I take omega-3 capsules every day.”

Those statements might all be true.

But I still want to know:

What does your test show?

What is your omega-6-to-omega-3 ratio?

What is your Omega-3 Index?

What are your levels of EPA and DHA?

What does your overall fatty-acid profile look like?

Suddenly, we have objective information that can help us better understand a person’s fatty-acid status.

Red Blood Cells Give Us a Different Window

This is one reason I became so interested in this type of testing.

We’re not simply asking what someone ate yesterday.

We’re looking at fatty acids associated with red blood cells.

Red blood cells circulate for approximately 120 days, making their fatty-acid composition useful as a longer-term biomarker of fatty-acid status.

And remember what the Omega-3 Index measures:

EPA + DHA in red blood cells.[13]

Now think back to everything we’ve discussed.

Fatty acids.

Cellular membranes.

Membrane properties.

Alpha-synuclein.

Neuronal biology.

Suddenly, measuring fatty-acid status becomes considerably more interesting than simply asking:

“Do you take fish oil?”

The Test Helps Tell Us How You Responded

That’s the distinction I want people to understand.

We’re already familiar with this principle in other areas of health.

If someone takes vitamin D, we can measure their vitamin D level.

If someone changes their diet to improve glucose control, we can measure glucose and hemoglobin A1c.

If someone is working to improve cholesterol, we can repeat their lipid panel.

So why wouldn’t we apply the same thinking to fatty-acid status?

If you’re deliberately trying to change your fatty-acid status:

measure your fatty-acid status.

In a randomized controlled study, 115 adults received different amounts of EPA and DHA for approximately five months.

The researchers found a dose-dependent increase in the Omega-3 Index.

But here’s what’s especially important:

Dose alone didn’t explain everyone’s response.

Baseline Omega-3 Index, body weight, age, sex, and physical activity helped explain additional person-to-person variability.[11]

That is exactly why simply saying:

“Take fish oil.”

isn’t where I want the conversation to end.

I want the next question to be:

“Did it work?”

And by “work,” in this context, I mean something very specific:

Did the nutritional intervention measurably change the fatty-acid biomarkers we were trying to change?

That’s a question testing can help answer.

Most People Have Never Been Told This Test Exists

Here is what continues to surprise me.

After decades working in nutrition and speaking with people throughout the United States, Canada, and elsewhere, I find that the overwhelming majority of people I encounter have never had their omega-6-to-omega-3 ratio tested—and many don’t even know such testing exists.

Think about that.

We routinely measure cholesterol.

We measure blood pressure.

We measure glucose.

We measure hemoglobin A1c.Some people monitor these numbers for decades.

Yet most people I meet cannot answer two simple questions:

What is your omega-6-to-omega-3 ratio?

and

What is your Omega-3 Index?

They don’t know.

In many cases, nobody has ever suggested that they find out.

That’s one of the reasons I have become so passionate about educating people about cellular health and fatty-acid testing.

Why This Matters to Our Parkinson’s Conversation

Now connect this back to what you’ve learned throughout this article.

Every neuron is surrounded by a membrane.

The fatty-acid composition of that membrane contributes to its physical properties.

DHA is an important structural component of neuronal membranes.

Alpha-synuclein interacts with lipid membranes.

Mitochondria depend on highly specialized membranes to produce cellular energy.

Oxidative stress can damage membrane lipids.

Products of lipid peroxidation can interact with alpha-synuclein.

And researchers are studying relationships among fatty-acid metabolism, alpha-synuclein, mitochondrial function, oxidative stress, inflammation, and neurodegeneration.[1,7,8]\

Then in 2025, researchers writing in Nature Reviews Neurology went so far as to propose looking at Parkinson’s disease as a “fatty acidopathy.”[1]

That’s why I believe this conversation deserves attention.

If someone is deliberately consuming omega-3s to change their fatty-acid status, we have a way to determine whether those biomarkers actually changed.

To me, that’s important information.

Test. Don’t Guess.

Someone tells me:

“I eat healthy.”

That’s good.

But what does it tell me biologically?

Not enough.

Someone tells me:

“I take fish oil.”

What does that tell us about their actual EPA and DHA status?

Not enough.

Someone tells me:

“My blood sugar is normal.”

What is their fasting insulin?

Someone says:

“I take vitamin D.”

What is their blood level?

This is why one of the principles I continue to teach is:

Test. Don’t Guess.

When objective information is available, we don’t have to rely entirely on assumptions.

We can measure.

We can establish a baseline.

We can make changes.

And we can measure again.

That’s the part I believe is so powerful.

BASELINE → INTERVENTION → RETEST → KNOW

Instead of:

SUPPLEMENT → ASSUME → HOPE

That doesn’t mean every biomarker has a proven Parkinson’s-specific treatment

target.

It means we’re replacing an assumption about nutritional status with objective information.

What I Hope You Take Away From This Article

If you made it this far, you now understand why I encouraged you at the beginning to keep reading.

Parkinson’s is much more complicated—and much more fascinating—than simply:

TREMOR + LOW DOPAMINE

Researchers are investigating relationships involving:

alpha-synuclein

mitochondria

oxidative stress

neuroinflammation

the gut microbiome

the gut-brain axis

cellular membranes

membrane fatty-acid composition

fatty-acid metabolism

genetics

environmental exposures

nutrition

and

exercise.

And in 2025, researchers went as far as proposing that Parkinson’s may involve a “fatty acidopathy.”[1]

That doesn’t mean we’ve solved Parkinson’s.

Far from it.

It means the questions scientists are asking are becoming deeper.

Instead of only asking:

How do we replace dopamine?

Researchers are also asking:

Why are these neurons becoming vulnerable in the first place?

What is happening to their mitochondria?

What is happening to alpha-synuclein?

What role might the gut play?

What is happening to the lipids surrounding and interacting with these proteins?

How does oxidative stress influence those fats?

How do inflammatory pathways become activated and resolved?

How do genes and environment interact?

And what role can nutrition and exercise play in creating a healthier biological environment?

And for the person already living with Parkinson’s, I want you to understand something else:

There are still areas of your health that you can actively work on.

You can work with your healthcare team on your nutrition.

You can exercise according to your abilities.

You can pay attention to sleep.

You can support metabolic and cardiovascular health.

You can address nutrient deficiencies when they are identified.

And if you’re intentionally trying to change your fatty-acid status, you can measure whether it actually changed.

Perhaps one of the most important lessons is that our cells don’t exist separately from the rest of our health.

Our organs are made of cells.

Our brain is made of cells.

Our neurons are cells.

And every one of those cells depends on membranes to function.

That is why cellular health matters.

And it is why I believe cell-membrane health deserves a much bigger place in the conversation about optimizing human health.

Want to Know Your Omega-6-to-Omega-3 Ratio?

After everything you’ve learned in this article about fatty acids, cellular membranes, membrane fluidity, mitochondria, alpha-synuclein, inflammation, and brain health, there is one question you may now be asking:

What is my omega-6-to-omega-3 ratio—and what is my Omega-3 Index?

You don’t have to guess.

The At-Home Cellular Health Test requires only a small blood sample collected from the convenience of your home and provides valuable information about your fatty-acid status, including your omega-6-to-omega-3 ratio and Omega-3 Index.

And remember one of the most important lessons from this article:

Taking omega-3s and knowing they are measurably changing your fatty-acid status are two different things.

If you’re already taking an omega-3 supplement, don’t simply assume that because you’re swallowing it, you’re achieving the fatty-acid status you’re trying to achieve.

Test it.

Establish your baseline.

Make your nutritional changes.

Retest.

See what actually changed.

How to Get the At-Home Cellular Health Test

If someone shared this article with you and you would like to get the At-Home Cellular Health Test, contact the person who shared this article with you.

They can help you learn more about the test and how to get started.

If no one personally shared this article with you, or you would like to contact me directly, email me at:

robert@dietfreelife.com

Whether you’re interested in being proactive about your long-term health, supporting healthy aging and brain health, or optimizing your overall health while living with Parkinson’s, knowing your numbers gives you information you simply don’t have when you’re guessing.

Your cells are the foundation of every organ and system in your body.

And healthy cellular function depends, in part, on properly functioning cellular membranes.

So don’t assume.

Measure. Make changes. Retest. Know.

Test. Don’t Guess.

References

1. 1. Fanning, S., & Selkoe, D. J. (2025). Parkinson disease is a fatty acidopathy. Nature Reviews Neurology, 21(11), 642–655. doi:10.1038/s41582-025-01142-2.
   2. National Institute of Neurological Disorders and Stroke. Parkinson’s disease: Hope through research. National Institutes of Health.
   3. Trist, B. G., Hare, D. J., & Double, K. L. (2019). Oxidative stress in the aging substantia nigra and the etiology of Parkinson’s disease. Aging Cell, 18(6), e13031. doi:10.1111/acel.13031.
   4. Postuma, R. B., Aarsland, D., Barone, P., Burn, D. J., Hawkes, C. H., Oertel, W., & Ziemssen, T. (2012). Identifying prodromal Parkinson’s disease: Pre-motor disorders in Parkinson’s disease. Movement Disorders, 27(5), 617–626. doi:10.1002/mds.24996.
   5. Oliver, P. J., Civitelli, L., & Hu, M. T. (2025). The gut-brain axis in early Parkinson’s disease: From prodrome to prevention. Journal of Neurology, 272, 413. doi:10.1007/s00415-025-13138-5.
   6. Menozzi, E., et al. (2025). The gut-brain axis in Parkinson disease: Emerging concepts and therapeutic implications. Movement Disorders Clinical Practice, 12(7), 904–916. doi:10.1002/mdc3.70029.
   7. De Franceschi, G., Fecchio, C., Sharon, R., Schapira, A. H. V., Proukakis, C., Bellotti, V., & de Laureto, P. P. (2018). α-Synuclein and polyunsaturated fatty acids: Molecular basis of the interaction and implication in neurodegeneration. Molecules, 23(7), 1531. doi:10.3390/molecules23071531.
   8. Shamoto-Nagai, M., et al. (2018). Modification of α-synuclein by lipid peroxidation products derived from polyunsaturated fatty acids promotes toxic oligomerization: Its relevance to Parkinson disease. Journal of Clinical Biochemistry and Nutrition, 62(3), 207–212. doi:10.3164/jcbn.17-84.
   9. Simopoulos, A. P. (2011). Evolutionary aspects of diet: The omega-6/omega-3 ratio and the brain. Molecular Neurobiology, 44(2), 203–215. doi:10.1007/s12035-010-8162-0.
   10. da Silva, T. M., Munhoz, R. P., Alvarez, C., Naliwaiko, K., Kiss, Á., Andreatini, R., & Ferraz, A. C. (2008). Depression in Parkinson’s disease: A double-blind, randomized, placebo-controlled pilot study of omega-3 fatty-acid supplementation. Journal of Affective Disorders, 111(2–3), 351–359. doi:10.1016/j.jad.2008.03.008.
   11. Flock, M. R., Skulas-Ray, A. C., Harris, W. S., Etherton, T. D., Fleming, J. A., & Kris-Etherton, P. M. (2013). Determinants of erythrocyte omega-3 fatty acid content in response to fish oil supplementation: A dose-response randomized controlled trial. Journal of the American Heart Association, 2(6), e000513. doi:10.1161/JAHA.113.000513.
   12. Wang, Z., Song, B., Liu, C., Ma, H., Bai, Z., Carneiro, M. A. S., Youssef, L., Chen, C., Zhang, L., Wang, D., & Wang, D. (2025). Effects of boxing exercise in people with Parkinson’s disease: A systematic review. Frontiers in Aging Neuroscience, 17, 1505326. doi:10.3389/fnagi.2025.1505326.
   13. Harris, W. S., & von Schacky, C. (2004). The Omega-3 Index: A new risk factor for death from coronary heart disease? Preventive Medicine, 39(1), 212–220. doi:10.1016/j.ypmed.2004.02.030.   

__________
Robert Ferguson is a California- and Florida-based single father of two daughters, clinical nutritionist, Omega Balancing Coach™, researcher, best-selling author, speaker, podcast and television host, health advisor, NAACP Image Award Nominee, creator of the Diet Free Life methodology, and Chief Nutrition Officer for iCoura Health. He also serves on the Presidential Task Force on Obesity for the National Medical Association and the Health and Product Advisory Board for Zinzino, Inc.

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