Widespread magnesium deficiency increases the risk of depression

Depression is a growing global problem. The role of diet is often overlooked, and according to a large U.S. population study published in Frontiers in Nutrition, magnesium deficiency appears to increase the risk. The authors note that magnesium’s antidepressant effect is linked to multiple mechanisms that support the nervous system and mood. Magnesium is also important for digestion and gut microbiota, and disturbances in the gut-brain axis can contribute to depression-like conditions. Magnesium deficiency is widespread due to unbalanced diets and ultra-processed foods. In addition, stress, insulin resistance, excessive calcium intake, and certain medications can increase the body’s requirement for magnesium.

Globally, around 300 million people are affected by depression, which is the leading cause of mental illness. Depression is associated with severely reduced quality of life, an impaired ability to reach one’s potential, and an increased risk of other diseases and suicide. While multiple factors can contribute to depression, there is growing evidence that diet and lifestyle play a major role. Analyses have shown that certain nutrients can protect against depression, while deficiencies in these nutrients increase risk. Previous studies have also indicated a link between magnesium and depression. The new study aimed to examine the role of magnesium in the prevention of depression more closely.

• Magnesium is primarily found in whole grains, nuts, seeds, almonds, avocado, cabbage, other dense vegetables, and fish.

Study methods and results

The researchers collected data from the large U.S. NHANES study (National Health and Nutrition Examination Survey), which tracks the population’s lifestyle and health over time. The study included 35,000 participants aged 32-67, evenly distributed between genders. Participants’ depression was assessed using the Patient Health Questionnaire-9. Their dietary intake of magnesium was evaluated through detailed dietary models and several telephone interviews. Participants were then divided into five groups based on how much magnesium they consumed through their diet.
The study found that low magnesium intake (under 366.7 mg per day) increased the risk of depression, particularly among participants under 60. Interestingly, higher magnesium intake appeared to increase depression risk in participants over 60. The researchers caution that the study has limitations, including other lifestyle factors and the fact that older adults often take medications for chronic conditions that may affect magnesium metabolism and the nervous system. Very plant-based diets that are low in protein and omega-3 fatty acids may also increase depression risk, even if magnesium intake is high. Therefore, meals must always be considered in a broader context.

• It is estimated that 2.4 billion people worldwide have a magnesium deficiency.

Magnesium’s effects on mood and the nervous system

Magnesium, one of the minerals we need most, is involved in over 600 enzymes. It is particularly important for bones, muscles, digestion, fluid balance, blood pressure, and calcium utilization. According to the study authors, magnesium is important for the nervous system in the following ways:

• Involved in the synthesis of phospholipids in cell membranes, which play a crucial role in brain function and emotional regulation.
• Inhibits calcium ion uptake by neurons, promoting a calmer, more balanced state.
• Regulates the production of the neurotransmitter serotonin, which affects the central nervous system, mood, memory, and many other functions.
• Influences digestion and gut microbiota, supporting the gut-brain axis, which is vital for mental health.

Additionally, magnesium plays a role in stress regulation, and many people with depression have a history of chronic stress. Magnesium can also improve sleep, which is often disrupted in depression. It is important for the activation and utilization of vitamin D, which has receptors in most cells, including neurons, the hypothalamus, and pituitary gland. Magnesium and vitamin D also help regulate inflammatory processes, which in the brain are frequently linked to depression. Magnesium and vitamin D can support stable blood sugar levels, which is relevant as many individuals with depression experience fluctuations in blood sugar and insulin resistance, negatively affecting brain energy metabolism and mood.

Causes of magnesium deficiency and poor utilization

• Unbalanced and refined diets
• Excessive stress
• Too much coffee or other stimulants
• Diuretics and antacids
• Excess calcium from supplements
• Insulin resistance, metabolic syndrome, and type 2 diabetes

References:

Yanpin Huang et al. Impact of dietary magnesium intake on depression risk in American adults: a Cross-sectional study of the National Health and Nutrition Examination Survey 2005-2020. Frontiers in Nutrition 2025

Simone Passarelli et al. Global estimation of dietary micronutrient inadequacies: a modeling analysis. The Lancet Global Health 2024

Ming Hui Chou et al. The Association of Serum and Dietary Magnesium with Depressive Symptoms. Nutrients 2023

Tuomas Mikola, et al. The effect of vitamin D supplementation on depressive symptoms in adults: A systematic review and meta‐analysis of randomized controlled trials. Critical Reviews in Food Science and Nutrition, 2022.