The Nutritional Physiology of PTSD: What If We Are Only Scratching the Surface?

By Dustin Strong, CHN, ACN

Trauma may be part of the story. It does not have to be the end of the story.

As I spend more time teaching about brain health, I keep coming back to a question that I believe deserves much more attention:

What if we are still underestimating the nutritional physiology of PTSD?

Post-traumatic stress disorder is extraordinarily complex. It would be irresponsible to suggest that PTSD is simply the result of a nutrient deficiency, or that nutrition can replace trauma-informed psychological, psychiatric, or medical care.

That is not the argument I am making.

My question is different.

A person experiencing PTSD still has a brain that requires nutrients.

They still have an HPA axis regulating their response to stress.

They still have to synthesize and metabolize neurotransmitters.

Their neurons still require healthy cellular membranes.

Their mitochondria still have to produce energy.

Their nervous system still depends upon processes governing inflammation, oxidative stress, synaptic remodeling, and neuroplasticity.

So why wouldn't we investigate those variables too?

Vitamin D: An Interesting Signal

One of the more intriguing nutritional associations involves vitamin D.

A population-based study of 1,653 trauma-exposed individuals found that vitamin D deficiency was associated with approximately twice the odds of PTSD.

Even more interestingly, researchers identified relationships involving vitamin-D-binding protein genetics, raising the possibility that the association may involve vitamin D metabolism itself rather than merely differences in lifestyle.

More recent research has reported significantly lower serum 25(OH)D in people with PTSD compared with controls.

And this is where the story becomes especially interesting from a brain-health perspective.

Vitamin D status has also been associated with the HPA axis, with lower vitamin D corresponding with higher CRH and ACTH and lower cortisol.

That doesn't prove that low vitamin D causes PTSD.

But it certainly gives us another question worth asking:

When someone is struggling with an altered stress response, should vitamin D status be one of the physiological variables we assess?

I believe it deserves consideration.

There is even emerging intervention research involving Gulf War veterans with vitamin D deficiency and co-occurring PTSD/TBI that reported improvements in PTSD, anxiety, and depressive symptoms following correction of the deficiency.

That evidence is preliminary. It is not sufficient to call vitamin D a treatment for PTSD.

But it is certainly enough to make me want more research.

Omega-3s: Another Piece of the Terrain

Omega-3 fatty acids offer another intriguing signal.

A 2026 UK Biobank analysis involving more than 82,000 adults found that higher plasma omega-3 levels were associated with significantly lower PTSD risk.

Again:

Association is not causation.

And previous omega-3 intervention trials in PTSD have produced mixed results. (There are many variable I could go into to give this context, but let's stick to the main point)

Omega-3s are structural components of neuronal membranes and participate in inflammatory signaling and normal brain function.

So perhaps the question isn't simply:

"Do omega-3 supplements treat PTSD?"

Perhaps a better question is:

"Does the fatty-acid environment of the brain influence its capacity to respond and adapt following trauma?"

Those are very different questions.

And the second one opens a much larger door.

What Does a Brain Need in Order to Change?

This brings us to neuroplasticity.

One of the most exciting areas of modern psychiatric research is the investigation of therapies that may help the brain become more plastic - more capable of forming new connections, modifying old patterns, and responding differently to experience.

Psilocybin research is particularly fascinating in this regard.

Preclinical research has demonstrated rapid structural changes following psilocybin exposure, including increased formation and density of dendritic spines in the frontal cortex. Remarkably, some of those structural changes persisted well beyond the acute psychedelic experience.

More recent research has continued to investigate how psilocybin affects cortical circuitry, synaptic plasticity, and stress-related behavior.

This does not mean psilocybin is an established treatment for PTSD. The clinical evidence specifically for PTSD remains developing, and psychedelic therapy carries important medical, psychological, legal, and screening considerations.

But the underlying scientific idea is fascinating:

What if part of helping a traumatized brain heal involves helping that brain become capable of changing again?

And that leads me to another question that I don't hear asked nearly enough.

If We Want Neuroplasticity, What Does the Brain Need to Build It?

If we're investigating ways to make the traumatized brain more capable of adapting, shouldn't we also be asking whether that brain has the nutritional resources required for:

Neuroplasticity?

Neurotransmitter synthesis?

Stress regulation?

Mitochondrial energy production?

Cell-membrane integrity?

Neuronal resilience?

Think about the nutrients involved in those processes.

Vitamin D.

Omega-3 fatty acids.

Magnesium.

Zinc.

Vitamin B6.

Folate.

Vitamin B12.

And potentially other trace elements that we have barely begun to investigate in this context.

This is where another particularly interesting element enters the conversation.

What About Lithium?

Most people hear the word lithium and immediately think of the pharmaceutical doses used in psychiatry.

But lithium is also a naturally occurring element present in varying amounts in water and food.

And from a brain-health perspective, its biology is fascinating.

Lithium has been studied extensively for effects on pathways involved in neuronal survival and plasticity. Research has demonstrated effects involving GSK-3, BDNF, CREB, Bcl-2, inflammatory signaling, glutamatergic activity, mitochondrial function, and other pathways involved in neuronal resilience.

BDNF deserves particular attention.

Brain-derived neurotrophic factor helps support neuronal survival, synaptic plasticity, and the brain's ability to adapt.

Interestingly, BDNF and neuroplasticity are also part of the emerging conversation around psychedelics.

So I find myself asking:

Could lithium be one of the overlooked pieces of the trauma and neuroplasticity conversation?

Not:

"Does lithium cure PTSD?"

We do not have evidence to make that claim.

And certainly not:

"Everyone with PTSD should take lithium."

Prescription lithium (in the U.S the prescription form is Lithium Carbonate) is a medication requiring medical supervision because therapeutic dosing can produce toxicity and requires appropriate monitoring. I am referring to naturally occuring or more bio-available forms of lithium like lithium orotate.

The question I am interested in is more fundamental:

What role might lithium biology play in creating a nervous system capable of resilience, adaptation, and repair?

And what might we discover if nutritional status, trace-element exposure, and neuroplasticity were studied more intentionally in trauma populations?

We need research designed specifically to answer those questions.

Perhaps We Are Asking Too Narrow a Question

Modern medicine often asks whether a single intervention treats a particular diagnosis.

That is an important question.

But sometimes it can be too narrow.

Instead of only asking:

"What treats PTSD?"

What if we also asked:

What does a traumatized brain need in order to heal?

What nutrients does it require?

What metabolic processes are impaired?

What inflammatory signals are elevated?

What is happening to mitochondrial function?

What is happening to the HPA axis?

What is happening to glutamate and GABA?

Does the individual have the raw materials necessary to manufacture and regulate serotonin, dopamine, norepinephrine, and other signaling molecules?

What supports BDNF and neuroplasticity?

What interferes with them?

And perhaps most importantly:

Which of those variables are measurable and modifiable?

That is where I believe nutritional medicine deserves a much larger role in the conversation.

Nutrition Isn't the only Answer. It Deserves a Seat at the Table.

There is already research supporting connections between nutritional physiology and PTSD.

There are also enormous gaps in that research.

To me, those gaps aren't a reason to dismiss nutrition.

They are a reason to study it.

Because if we are willing to investigate sophisticated therapies designed to reopen windows of neuroplasticity, we should also be willing to investigate whether the brain has the biological resources necessary to take advantage of that opportunity.

That may include vitamin D.

It may include omega-3 fatty acids.

It may include magnesium, zinc, B vitamins, and other nutritional variables.

And perhaps lithium deserves to be part of that research conversation as well.

I don't believe the future of trauma care will be found in choosing between psychology, medicine, nutrition, lifestyle, or emerging therapies.

I believe the future will come from understanding how these pieces interact.

Expanded, not alternative.

And for the veterans and others living with PTSD whom I have had the privilege of working with, that larger perspective carries something extraordinarily important:

Hope.

Hope that there are still variables we haven't examined.

Hope that there are still questions researchers haven't answered.

Hope that the brain retains an extraordinary capacity to adapt.

And hope that today's diagnosis does not have to define tomorrow's possibilities.

Trauma may be part of the story.

It does not have to be the end of the story.