1Trauma

Trauma absolutely belongs in a conversation about mental health.

Severe or prolonged psychological stress can influence the hypothalamic-pituitary-adrenal axis, autonomic nervous system, sleep architecture, inflammatory signaling and stress-hormone regulation.

Someone who has lived through abuse, neglect, violence, medical trauma, loss, instability or prolonged fear may develop persistent changes in how the body responds to perceived threats.

And genetics may influence individual sensitivity to stress.

Genes I find particularly interesting in this area include:

These pathways participate in cortisol signaling, stress responsiveness, neurotransmitter metabolism and neuroplasticity.

Nutrition doesn't erase trauma.

But the nervous system still requires adequate nutritional resources while trauma is being addressed.

I pay particular attention to:

Trauma-informed psychological care and physiological support can belong in the same conversation.

2Chronic Stress

The body was designed to respond to stress.

The problem comes when physiological activation becomes frequent or recovery is poor.

Norepinephrine and epinephrine rise. Cortisol signaling changes. Blood glucose regulation changes. Sleep may deteriorate. Magnesium requirements may become harder to meet. Oxidative stress can increase. Inflammatory signaling can change.

Now imagine living in that physiology for months or years.

Genes involved in this conversation include:

COMT is particularly interesting because it participates in the metabolism of catechol compounds, including dopamine, norepinephrine and epinephrine.

This doesn't mean a COMT variant causes anxiety.

It means catecholamine metabolism is one part of the physiology worth understanding.

Nutrients involved in these pathways include magnesium, riboflavin, folate, B12, B6, vitamin C and adequate protein.

3Sleep Deprivation

I don't think we can adequately discuss mental health without discussing sleep.

A sleep-deprived brain behaves differently.

Attention changes. Emotional regulation changes. Stress tolerance falls. Appetite signaling changes. Blood sugar regulation can worsen. Pain sensitivity increases. And anxiety itself can become harder to regulate.

Then poor mental health disrupts sleep further.

Genetic pathways I look at around sleep and arousal include:

Nutritionally, I think about magnesium, glycine, B6, iron when deficient, B12 status, folate status and adequate daytime nutrition.

Before treating poor concentration as purely a neurotransmitter problem, I want to know whether someone's brain is actually sleeping.

4Iron Deficiency

Iron deserves far more attention in mental health discussions.

The brain needs iron.

Iron participates in oxygen transport, mitochondrial function and neurotransmitter biology.

Low iron stores may coexist with fatigue, exercise intolerance, restless legs, poor concentration, headaches and cognitive complaints.

Women with heavy menstrual bleeding are particularly important to assess.

So are growing children, teenagers, pregnant women, postpartum women, vegetarians, vegans and anyone experiencing gastrointestinal blood loss or impaired nutrient absorption.

Genetic pathways that can influence iron regulation include:

Iron supplementation should be based on actual need because excess iron can also be harmful.

Useful assessment may include ferritin alongside a broader iron panel and clinical context.

5Vitamin B12

B12 is heavily involved in neurological function.

Deficiency can affect cognition, energy, sensation and mood.

The pathways I pay attention to include:

These genes participate in B12 transport, utilization or one-carbon metabolism.

And this is where genetics becomes useful.

A normal-looking diet doesn't guarantee identical nutrient handling between two people.

6Folate and Methylation

Methylation has become one of the most oversimplified areas of nutritional medicine.

It involves much more than MTHFR.

Relevant genes include:

These pathways help move one-carbon units through folate and methionine metabolism.

They influence homocysteine metabolism and production or regeneration of molecules such as methionine and S-adenosylmethionine.

SAM participates in methylation reactions throughout the body.

Nutrients involved include:

This is also why I don't believe everyone should blindly take enormous amounts of methylfolate simply because an MTHFR variant appears on a genetic report.

Genetics should inform the investigation.

It shouldn't replace physiology.

7Vitamin B6

Vitamin B6 participates in an enormous amount of brain chemistry.

Its active form, pyridoxal-5-phosphate, participates in amino acid metabolism and neurotransmitter-related reactions.

Relevant genes include:

B6 participates in pathways involved in serotonin, dopamine and GABA biology.

And like every nutrient, more isn't automatically better.

Long-term excessive supplemental B6 can cause toxicity, including peripheral neuropathy.

The goal is appropriate nutritional support.

8Magnesium

Magnesium touches hundreds of enzymatic reactions.

It participates in ATP biology, neuronal signaling, muscle function and normal nervous-system physiology.

I look at magnesium in people describing tension, poor sleep, stress sensitivity and certain neuromuscular symptoms, while also considering the larger clinical picture.

COMT is often discussed here because COMT is a magnesium-dependent enzyme.

Again, the relationship is biochemical.

A COMT genotype doesn't tell me that someone automatically needs a high dose of magnesium.

It tells me another piece of their physiology.

9Zinc and Copper

Zinc and copper both matter to the nervous system.

And balance matters.

Zinc participates in neuronal signaling, immune regulation and antioxidant biology.

Copper participates in enzymes involved in neurotransmitter synthesis, connective tissue and antioxidant defenses.

One copper-dependent enzyme that matters tremendously to brain chemistry is dopamine beta-hydroxylase, which converts dopamine to norepinephrine.

Genes involved include:

This is one reason I don't recommend treating zinc and copper as opposing nutrients that should be manipulated casually.

Both are biologically necessary.

10Omega-3 Fatty Acids

The brain is extraordinarily lipid-rich.

Cell membranes depend on fatty acids.

EPA and DHA have been studied extensively in relation to brain and mental health.

But here's where nutrigenomics gets interesting.

Genes such as:

influence fatty-acid metabolism.

Someone's ability to convert shorter-chain essential fatty acids into longer-chain forms can vary.

That's one reason I pay attention to dietary intake and genetics together.

11Vitamin D

Vitamin D functions much more like a signaling molecule than people realize.

Vitamin D receptors are widely distributed throughout the body, including the brain.

Genes I look at include:

Vitamin D status has repeatedly been studied in relation to mood disorders, although association does not prove that deficiency is the sole cause of someone's depression.

The physiology still matters.

Testing can tell us much more than guessing.

12Blood Sugar Instability

I've seen people describe episodes of:

when they haven't eaten adequately.

The brain has substantial energy requirements.

Sharp swings in glucose regulation can feel neurological and emotional.

Genes involved in glucose physiology include:

But genetics is only one component.

Meal composition, protein intake, sleep, stress hormones, insulin sensitivity, physical activity and total caloric intake also matter.

13Thyroid Function

Thyroid hormone affects nearly every organ system.

Changes in thyroid function can coexist with depression, anxiety, fatigue, cognitive slowing, sleep disturbance and changes in heart rate.

Relevant genes include:

Nutrients involved include iodine, selenium, iron, zinc and adequate protein.

This doesn't mean everyone with anxiety needs thyroid supplements.

It means thyroid physiology belongs in the differential conversation.

14Hormones

Mental health can shift dramatically with hormonal transitions.

Puberty. Menstrual cycling. Pregnancy. Postpartum. Breastfeeding. Perimenopause. Menopause. Hormonal therapy.

These periods can involve major changes in estrogen, progesterone and other signaling systems.

Genes I look at include:

Hormones interact with neurotransmitters, sleep, histamine signaling, vascular physiology and stress chemistry.

If someone's mental health symptoms repeatedly change during a particular phase of their menstrual cycle, I want that pattern documented.

Timing is data.

15Postpartum Physiology

Postpartum women deserve their own category.

Pregnancy and lactation require tremendous nutritional resources.

Then childbirth adds blood loss, hormonal withdrawal, fragmented sleep, psychological adjustment and physical recovery.

Some women are also breastfeeding around the clock.

Mental health support after birth should consider psychiatric symptoms alongside physiology.

These all deserve consideration.

16Perimenopause

Perimenopause can begin years before menstruation stops.

Hormonal variability during this period can affect sleep, body temperature regulation, cognition and mood.

Some women experience new anxiety.

Some develop panic symptoms.

Some experience migraines, insomnia, brain fog or depressive symptoms.

Genes involving estrogen signaling and metabolism can add another layer, including ESR1, ESR2, CYP19A1, CYP1B1 and COMT.

The pattern across the menstrual cycle can be incredibly informative.

17Histamine

Histamine is usually discussed as an allergy molecule.

It's also a neurotransmitter.

Histamine participates in wakefulness, arousal, appetite and neurological signaling.

Relevant genes include:

DAO, encoded by AOC1, is particularly important in extracellular and intestinal histamine metabolism.

HNMT participates in intracellular histamine metabolism and relies indirectly on methylation because it uses SAM as a methyl donor.

Nutrients I think about around histamine physiology include vitamin C, copper in the appropriate context, B vitamins and adequate methylation cofactors.

Histamine isn't the explanation for every anxiety symptom.

But in the right person, it may be one component.

18The Gut-Brain Axis

The gut communicates with the brain through neural, immune, endocrine and metabolic pathways.

The microbiome can produce or modify biologically active compounds.

The gut also determines whether we're adequately digesting and absorbing many of the nutrients the brain requires.

Relevant genetic pathways may include:

Research continues to investigate relationships between the gut microbiome, anxiety, depression and other psychiatric conditions.

I think this area is fascinating.

I also think we need to avoid turning every psychiatric symptom into a gut diagnosis.

The biology is much bigger than that.

19Inflammation

One of the most important developments in modern psychiatric research has been recognition of the relationship between immune signaling and mental health.

Researchers have repeatedly investigated inflammatory markers including:

in subsets of people with depression and other psychiatric disorders.

Genetics can influence inflammatory responses as well.

Genes of interest include:

Inflammation may alter neurotransmitter biology, energy production, sleep and behavior.

That doesn't mean depression is simply inflammation.

It means inflammation belongs in the larger biological picture.

20Oxidative Stress

The brain consumes tremendous amounts of oxygen and energy.

That makes antioxidant defense particularly important.

Genes I look at include:

These pathways help manage reactive oxygen species and cellular stress.

Nutrients involved include:

Glutathione biology also depends on adequate precursor availability and cellular energy.

21Mitochondrial Function

Your neurons are metabolically expensive cells.

They need ATP constantly.

Mitochondrial dysfunction can affect energy availability and increase oxidative stress.

Genes involved in mitochondrial biology include hundreds of nuclear and mitochondrial genes, but common pathways I watch include:

Nutritional cofactors involved in cellular energy production include:

This is why severe fatigue and cognitive dysfunction deserve a broader physiological evaluation.

22Neurotransmitter Production

Serotonin, dopamine, norepinephrine and GABA aren't produced out of thin air.

Their pathways require amino acids and enzymatic cofactors.

Serotonin begins with tryptophan.

Dopamine and norepinephrine begin with tyrosine.

GABA can be synthesized from glutamate.

Important genes include:

Relevant nutrients include:

Again, the system is interconnected.

23Neurotransmitter Transport and Receptors

Making a neurotransmitter is only one part of the story.

The brain also has to release it, receive the signal, transport it and metabolize it.

That brings us to genes like:

These are some of the pathways that make pharmacogenomics and psychiatric genetics so interesting.

Individual variants generally have modest effects and don't diagnose mental illness by themselves.

Patterns become more informative when genetics is interpreted alongside symptoms, history, medications, environment and nutritional status.

24Medication Effects

Medication belongs in this conversation too.

Many medications can influence sleep, appetite, nutrient status, neurotransmitter signaling and cognition.

Psychiatric medications can also produce dramatically different responses between individuals.

Pharmacogenomic genes including:

can influence metabolism of certain medications.

Other genes can influence pharmacodynamic response.

This is where genetic information can have very practical clinical relevance.

25Caffeine

For one person, coffee feels wonderful.

For another, it produces shaking, insomnia and anxiety.

Genes involved include:

CYP1A2 participates in caffeine metabolism.

ADORA2A affects adenosine signaling.

Sleep quality, dose, tolerance, medications, hormonal status and stress load can all change someone's response too.

Sometimes a mental health investigation needs to include what is sitting in the coffee cup.

26Alcohol

Alcohol affects GABA, glutamate, dopamine, sleep architecture, blood sugar and nutrient status.

Genes such as:

influence alcohol metabolism.

Someone doesn't have to meet criteria for alcohol dependence for alcohol to influence anxiety, sleep or mood.

27Chronic Pain

Pain changes the nervous system.

Living with pain day after day affects sleep, stress hormones, movement, inflammatory signaling and psychological health.

Pain and mental health also influence one another.

Someone living with chronic illness deserves more than being told that physical symptoms are simply anxiety.

Both physiology and psychological burden deserve attention.

28Autonomic Nervous System Dysfunction

Some symptoms that feel like panic can overlap with autonomic physiology.

People experiencing these symptoms still need appropriate medical evaluation.

Genes affecting vascular tone, catecholamines and autonomic signaling may include:

Electrolytes, hydration, iron status, nutrition and blood volume can also become relevant depending on the condition.

29Environmental Factors

Human brains exist inside environments.

Mold exposure. Air pollution. Heavy metals. Occupational exposures. Pesticides. Solvents. Excessive noise. Extreme heat. Chronic environmental stress.

These exposures can affect neurological and physiological health depending on dose, duration and individual susceptibility.

Environmental medicine needs evidence and careful assessment because symptoms attributed to environmental exposure are often nonspecific.

30Social Isolation

Biology doesn't mean ignoring human experience.

Loneliness matters. Relationship instability matters. Financial insecurity matters. Unsafe housing matters. Caregiver exhaustion matters. Bullying matters. Abuse matters. Living without meaningful support matters.

You cannot supplement someone out of an unsafe environment.

Mental health is biological, psychological and social at the same time.

31Nutritional Depletion as a Whole

Sometimes I think we've become too obsessed with individual supplements.

The brain requires an entire nutritional ecosystem.

Someone surviving on coffee, processed snacks and one real meal at night may have very different nutritional physiology from someone consuming nutrient-dense meals consistently.

Before asking which supplement increases serotonin, I want to know whether the body has the raw materials necessary to run its basic chemistry.