Nothing here replaces psychiatric care, and severe mental illness needs treatment. What follows is about the inputs that are rarely examined and often matter.
Energy, and where it comes from
The brain is roughly two percent of body weight and consumes about twenty percent of resting energy. It has almost no storage. It is therefore unusually exposed to anything that disrupts fuel supply — and insulin resistance in the brain is now a well-described phenomenon, appearing in the literature on both depression and dementia.
- Blood sugar swings produce adrenaline surges as glucose falls. Physiologically that is a counter-regulatory response; experientially it is anxiety, irritability and panic
- Reactive hypoglycaemia after a high-carbohydrate meal is a common and easily-missed contributor to afternoon anxiety and mood collapse
- Stable blood sugar — through adequate protein, fat and fewer refined carbohydrates — is one of the more reliably noticeable changes people report
Metabolic psychiatry
Ketogenic therapy for psychiatric illness has moved from anecdote to formal research, with published pilot work in bipolar disorder and schizophrenia and controlled trials now running. Ketones are an alternative brain fuel and appear to stabilise membrane excitability — which is also why the diet was developed for epilepsy a century ago and remains standard care there.
That a diet developed for seizures shows promise in bipolar disorder is less surprising than it sounds: both involve neuronal excitability, and mood stabilisers and anticonvulsants have long been the same drugs.
Inflammation
A meaningful subset of depression is accompanied by raised inflammatory markers, and inducing inflammation experimentally produces depressive symptoms in healthy people. This does not mean depression is an inflammatory disease; it means that for some people, the inflammation is part of it, and the sources — gut, visceral fat, poor sleep, chronic infection — are addressable.
The unglamorous inputs
- Sleep, which is bidirectional with almost every psychiatric condition and is the single highest-yield thing to fix first
- Morning daylight, which sets the circadian clock that regulates both mood and sleep
- Exercise, with an effect size in mild to moderate depression comparable to medication in several meta-analyses
- Alcohol, which is a depressant given a social pass and which wrecks sleep architecture even in modest amounts
- Omega-3, B12, folate, vitamin D, magnesium and iron — all with plausible mechanisms and all worth measuring rather than guessing at
Holding both things
Recognising that metabolism affects mental health is not the claim that mental illness is a dietary failure, and it is certainly not a reason to stop medication. It is the observation that a system running on unstable fuel, poor sleep and chronic inflammation is harder to treat than one that is not — and that those are inputs somebody can actually change.
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