The surprising tie between what you eat and your anxiety
But here's where it gets controversial: your diet might be quietly shaping how you feel, sometimes in ways you never expected.
By May 2024, Ebony Dupas realized something was off. She had started experiencing a mild sense of anxiety about her direction and purpose, and within a few weeks that unease grew into a paranoid fear she couldn’t explain or shake. Referred by her doctor, she began seeing several psychiatrists. Many leaned toward diagnosing her with generalized anxiety disorder, bipolar disorder, or even schizophrenia, and most suggested starting medications right away. One clinician, however, ordered bloodwork first to check for underlying issues. That test revealed something simple yet powerful: she was markedly deficient in magnesium.
Most people who seek help for anxiety or depression rely on a familiar duo: medication—often an SSRI—and psychotherapy. Yet growing interest in the connection between nutrition and brain health is pushing researchers to explore how what we eat might influence psychiatric symptoms. Evidence now points to a relationship between the gut microbiome and mental health, and to links between micronutrient shortages—magnesium, choline, and others—and conditions like anxiety and depression.
Despite this interest, the evidence about using supplements to treat mental health issues remains unclear. There aren’t robust clinical trials proving that micronutrients reliably alleviate symptoms, and research in this area is notoriously difficult. The supplement market is vast and loosely regulated by the FDA, with many products and formulas that lack thorough testing.
While the idea that nutrition matters for brain health is widely acknowledged, it isn’t routinely integrated into mental health care. Doctors don’t always connect diet to mood, and patients may not realize the potential impact of nutrition. Uma Naidoo, founder of nutritional and lifestyle psychiatry at Massachusetts General Hospital and author of Calm Your Mind With Food (2023), notes that the link between food and the brain is often overlooked. Future research clarifying how micronutrients—whether consumed in food or as supplements—affect mental health could help reduce this oversight.
How diet relates to mental health
The connection might sound surprising, but it rests on basic biology. As Naidoo explains, the same digestive environment that processes our meals is also a cradle for neurotransmitter production. The gut generates a large share of serotonin and a substantial portion of GABA, neurotransmitters central to mood regulation. Antidepressants and anti-anxiety medications, including SSRI drugs, target serotonin pathways.
A well-supported aspect of this relationship is how food shapes the gut microbiome. Years of research show that gut inflammation and microbial composition are tied to anxiety, depression, and potentially other psychiatric conditions. At the same time, scientists are examining how specific vitamins and minerals influence brain function.
“The brain and mental health are no longer just ‘above the neck’ problems,” Naidoo emphasizes.
Deficiencies in several micronutrients—magnesium, B vitamins, vitamin D, omega-3s, choline, and L-theanine—have been linked to mood and anxiety disorders. Studies in animals show that lowering magnesium can provoke anxiety-like states, underscoring the potential importance of these nutrients for mental health. However, translating these findings to humans remains imperfect, and the impact of supplementation varies widely.
The research landscape is mixed and still developing. A 2024 review suggested that magnesium supplements may help with mild anxiety and insomnia, particularly for those with existing low magnesium, but effects across studies are inconsistent. Reasons for divergence include the many magnesium forms available—magnesium citrate, malate, glycinate, oxide, chloride, and others—and how well each form delivers magnesium to the brain. Similar questions apply to other micronutrients.
As biology remembers, we can’t manufacture most vitamins and minerals; they must come from a varied diet. Yet national data show widespread shortfalls: many Americans don’t meet recommended intakes for vitamin D, magnesium, and choline, among others.
The bottom line is nuanced: nutrition clearly matters for brain health, but gaps in knowledge make it hard to prescribe supplements as a standard mental-health treatment. Ideally, future research will reveal which micronutrients most influence brain function, how to maximize their absorption, and exactly how they modulate mental health disorders. After all, our understanding of why mental health conditions arise is still evolving.
What role should nutrition play in mental health care?
In Dupas’s case, a physician ordered bloodwork and, finding a magnesium deficiency, recommended a regimen of magnesium plus L-theanine, B-complex vitamins, and omega-3s alongside a small SSRI. Within a few weeks, she felt a return of clarity—less paranoia, improved focus, and a better sense of direction. Dupas may be unusual in her rapid response to supplementation, yet her experience highlights a workable approach: identifying and addressing potential nutrient deficiencies can be a meaningful part of care.
Experts agree that most people with mental health concerns won’t experience dramatic symptom relief from supplements alone. Still, addressing deficiencies can be a valuable component of a comprehensive plan. Physicians like Rawji view supplements as a multipronged tool rather than a substitute for established treatments like SSRIs or benzodiazepines. He cautions against expecting magnesium to function like a benzo; unrealistic hopes can lead to disappointment.
Not all psychiatrists routinely assess diet or nutrition deficiencies, according to Naidoo. This gap can mean missed opportunities for simple, impactful changes. Moreover, overemphasizing supplements carries its own risks. A healthy, balanced diet typically provides ample vitamins and minerals, and relying on pills instead of whole foods isn’t ideal.
There’s almost always room to leverage nutrition to boost mental health, because no one maintains a perfect diet. If you want to increase intake of certain micronutrients, Naidoo suggests practical steps: add more leafy greens, nuts, and legumes for magnesium; choose foods rich in B vitamins (milk, eggs, whole grains); include choline-rich foods (eggs, beans, cruciferous vegetables); opt for fatty fish and eggs for vitamin D; and enjoy green tea for L-theanine.
Nutrition is a powerful, consequential tool for overall health, and we now recognize that its benefits extend to the brain as well. As Naidoo puts it, “The brain and mental health are no longer just ‘above the neck’ problems.”
Would you be willing to explore dietary changes or targeted supplements as part of a mental-health plan, even if results might vary from person to person? How do you think clinicians should balance nutrition with traditional treatments when addressing anxiety or mood disorders?
