How Metabolism Affects Mental Health
From my clinical practice, I work from the understanding that mood, cognition, and emotional regulation are deeply intertwined with other aspects including one’s metabolism. Here, you will learn some basics on metabolic health—meaning what you eat— and how it can be a key player in your mental health.
Understanding metabolism and mental health has led me to ask a different kind of question: What if some mental health symptoms are not simply psychological or neurochemical, but also metabolic in nature? Consider this question as inclusive whereas it does not dismiss trauma, attachment, meaning, or lived experience. Instead, it widens the lens—inviting us to consider whether the brain’s access to energy (food) may shape how well a person can think, feel, cope, and heal.
Metabolism
“Metabolism” is commonly misunderstood. It is not simply about body weight or diets. Metabolism refers to how the body:
- Converts food into usable energy
- Delivers that energy to cells
- Maintains stable signaling between organs, hormones, and the brain
The brain, in particular, is an energy-intensive organ. Despite its relatively small size, it consumes a disproportionate share of the body’s energy. When energy delivery or utilization is impaired—whether through insulin resistance, inflammation, or mitochondrial dysfunction—mental health symptoms often intensify.
Defining insulin resistance:
Insulin resistance (from high carbohydrate intake) means the body doesn’t respond to insulin the way it should. Insulin is a hormone that helps move fuel from the blood into cells so the body can use it for energy, but when cells stop responding well, the body has to make more insulin to get the same job done. Over time, this can make people feel unwell in different ways—such as low energy, brain fog, increased inflammation, mood changes, and disrupted hormones. It contributes to autoimmune disorders and other severe health conditions such as cancer and heart disease.
In addition, it makes weight loss very difficult because high insulin levels tell the body to store energy rather than release it. When insulin is chronically elevated, the body is biochemically blocked from accessing stored body fat. Fat loss cannot occur efficiently in a high-insulin state because insulin actively tells fat cells to hold onto energy, not release it.
This framing aligns with what many clinicians observe: when the body is under metabolic strain, emotional regulation becomes harder, resilience narrows, and mental health symptoms can become more pronounced.
The brain as an energy organ
Psychiatrist Dr. Chris Palmer has articulated what he calls the metabolic theory of mental illness. In this model, conditions such as depression, bipolar disorder, anxiety disorders, and even schizophrenia are understood—at least in part—as disorders of brain energy metabolism. When patients report mental exhaustion without clear psychological cause, shut down under stress, anxiety and other symptoms, it raises the question of whether brain cells are struggling to meet energy demands. This by no means negates psychological explanations.
Insulin resistance and the mental health connection
Insulin is often discussed only in the context of diabetes, yet insulin receptors are widely distributed throughout the brain. Insulin signaling plays a role in:
- Neurotransmitter regulation (the brain’s way of keeping chemical communication steady rather than chaotic, allowing thoughts and emotions to rise and settle appropriately)
- Learning and memory
- Mood stability and motivation
When insulin resistance develops—systemically or in the brain—these processes may be affected. This helps explain why some patients feel emotionally “stuck” despite insight, effort, and therapeutic engagement. Nutritional psychiatrist Dr. Georgia Ede has written and spoken extensively about this metabolic link. In clinical terms, insulin resistance can present not just as metabolic dysfunction, but as depressive symptoms resistant to treatment, brain fog and slowed thinking, emotional volatility.
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Mitochondria
Mitochondria—referred to as the cell’s power plant—convert fuel into usable energy. The brain is especially dependent on mitochondrial efficiency. When mitochondrial function is compromised:
- Neurons fatigue more easily
- Oxidative stress increases (associated with inflammation, fatigue, impaired cellular function, and accelerated aging).
- Neurotransmitter systems become less stable
Clinically, this can look like chronic anxiety, low motivation, reduced stress tolerance, or fluctuating mood. Dr. Palmer and others suggest that improving metabolic conditions that support mitochondrial health may reduce symptom burden in some individuals.
Inflammation’s impact
Chronic inflammation is another point where metabolism and mental health intersect. Inflammatory cytokines can:
- Disrupt insulin signaling
- Reduce energy efficiency in the brain
- Alter neurotransmitter production
This is particularly relevant for individuals with autoimmune or inflammatory conditions, where mental health symptoms often fluctuate alongside physical disease activity. In some cases, the nervous system may be responding to physiological stress rather than psychological threat.
Where nutrition fits in
Physician Dr. Anthony Chaffee and other metabolic-health clinicians emphasize that food is not merely fuel—it is a signal. Dietary patterns influence hormones, inflammation, insulin dynamics, and the fuels available to the brain. Chaffee emphasizes a different nutritional approach that strongly varies from conventional belief. Chaffee and other metabolic health clinicians recommend a strict carnivore diet—focused exclusively on animal-based foods like meat and fat—as a way to reduce inflammatory triggers, stabilize metabolism, and support overall physiological and mental health in some individuals.
Learn more: https://youtu.be/PL31nbQPgQU?si=WeiaCRJf67cj3h8-
Metabolic health does not replace:
- Therapy
- Relationship repair
- Meaning-making
- Trauma processing
However, it may influence how accessible those processes are. When the brain is under energetic strain, insight alone may not translate into change. When metabolic conditions improve, many people find they have more capacity to engage emotionally, relationally, and achieve desired change.
Resources for further learning
For those who want to explore this intersection further, these talks and resources are accessible and clinically relevant:
- Dr. Georgia Ede – “Change Your Diet, Change Your Mind”
https://www.youtube.com/watch?v=UeI3wXhF3b4 - Dr. Chris Palmer – Metabolic Theory of Mental Illness
https://www.youtube.com/watch?v=IrPtrDLvfEQ - Metabolic Mind – interviews with clinicians and researchers
https://www.youtube.com/@MetabolicMind - Dr. Anthony Chaffee – metabolism and health lectures
https://www.youtube.com/@anthonychaffeemd
In closing
Mental health does not live only in the mind. It lives in bodies, in cells, in energy systems, and in the ongoing conversation between physiology and experience. Attending to metabolism acknowledges that sometimes distress is not a failure of insight or effort, but a signal from a system under strain. I believe that as research evolves, metabolic health may become one more tool—alongside therapy, community, and meaning—for supporting mental well-being in a more integrated way.
Please leave your thoughts & comments below. TY ☺️
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