Food & mental health

B vitamins & mood

Helpful for stress, less so for mood

B vitamins help your body make neurotransmitters like serotonin and dopamine, turn carbohydrates into energy and break down amino acids. Running short on them can compromise each of those jobs, and low B12 and folate in particular are linked with low mood and fatigue.

What happens when you add more is less dramatic. A 2019 meta-analysis of B vitamin supplement trials in healthy and at-risk adults found a benefit for stress. The benefit for depressive symptoms didn't reach significance, and there was none for anxiety. Get them from food first. They're water-soluble, but whole foods still make excess intake less likely.

Food sources: whole grains, eggs, beans, citrus fruit, avocado, meat, poultry, fish, fortified cereals and liver.

Magnesium & anxiety

The best trial result of the six

Magnesium helps regulate the nervous system. Low intake has been linked with agitation, anxiety, irritability, poor sleep and headache, and in severe deficiency, confusion and hallucinations.

The most-cited paper on the subject, a 2006 report in Medical Hypotheses, describes case histories of rapid recovery from depression on magnesium. Case histories are a hypothesis, not proof. The stronger test is a 2017 randomized trial in 112 adults with mild to moderate depression. Six weeks of 248 mg of elemental magnesium a day improved depression scores by 6 points and anxiety scores by 4.5 points compared with no treatment. It was open-label, so people knew what they were taking.

Magnesium also matters for sleep quality, and better rest is one of the foundations of mental health.

Food sources: dark leafy greens, nuts and seeds, salmon, tuna, soybeans, avocado, banana, dark chocolate, brown rice and Greek yogurt.

Omega-3s & depression

Promising, but trials disagree

Omega-3 fats, mainly EPA and DHA, are part of brain cell membranes and help neurotransmitters like serotonin and dopamine work. A 2024 research review concluded they have antidepressant effects, likely through calming inflammation in the brain, supporting neurotransmitter function and helping the brain adapt.

The same review is candid that clinical trials of omega-3 supplements have been inconsistent. Some found clear drops in depressive symptoms, others found little or none, with dose and the ratio of EPA to DHA among the likely reasons. Eating fatty fish twice a week is the low-risk way to cover it.

Food sources: mackerel, salmon and oysters supply EPA and DHA directly. Flaxseed, chia seeds, walnuts and soybeans supply ALA, a plant omega-3 the body converts to EPA and DHA only in small amounts.

Vitamin C & mental energy

Sharper focus, not a mood fix

Vitamin C intake tends to sit at one extreme or the other: too little from a diet low in fruit and vegetables, or more than needed from supplements. It protects cells, supports the immune system and helps you absorb iron, and low iron itself can leave you tired and foggy.

The research the post links is a 2022 trial in healthy young adults whose vitamin C levels were low. Four weeks of 500 mg twice a day improved attention and work engagement compared with a placebo. It didn't change mood, stress or anxiety. So vitamin C may help how alert you feel when you're short on it, not how happy you feel.

Getting enough is as simple as a couple of servings of fruit or vegetables a day.

Food sources: citrus fruit, bell peppers, tomatoes, strawberries and broccoli.

Vitamin D & depression

Linked, but supplements disappoint

Vitamin D acts on brain cells, and low blood levels go along with depression. A 2020 review of 61 studies confirmed that blood vitamin D levels are inversely linked with clinical depression, but the direction is unclear. Low vitamin D may raise the risk of depression, depression may lower vitamin D (less time outdoors, a poorer diet), or both.

A 2025 review in Clinical Nutrition describes how vitamin D may influence neurotransmitter activity, inflammation in the brain and the brain's ability to adapt. The trial evidence is more sobering. In VITAL-DEP, 18,353 adults aged 50 and older took 2,000 IU of vitamin D3 a day or a placebo for a median of 5.3 years, and vitamin D didn't prevent depression or improve mood. The 2020 review found supplements helped most in people who were both depressed and deficient.

So check before you supplement. Vitamin D is fat-soluble, and the upper limit for adults is 4,000 IU (100 mcg) a day, according to the NIH Office of Dietary Supplements. Ask your doctor for a blood test before you start.

Food sources: salmon, tuna, liver, fortified orange juice and fortified dairy foods.

Zinc & depression

A link worth taking seriously

Zinc is used throughout the nervous system. A 2017 review describes how low zinc is linked with depression and psychosis, and notes that deficiency often comes from a poor diet, poor absorption with age or conditions such as alcohol use, and common medications that interfere with absorption.

Correcting a deficiency is associated with fewer depressive symptoms in that research, and enough zinc also supports immunity. As with the others, the goal is enough, not more. High-dose zinc can interfere with copper absorption.

Food sources: oysters, red meat, poultry, beans, nuts, crab, lobster, whole grains and fortified cereals.