Magnesium Depletion Linked to Depression, and How to Replenish It Effectively

Personalized nutrition strategies offer new hope for low magnesium and mood disorders.

Illustration by The Epoch Times, Shutterstock

For months, Marcia Rossouw had been feeling off.

“I wasn’t crying all the time, but I had this constant low-level anxiety and a strange heaviness I couldn’t shake,” she told The Epoch Times.

Sleep no longer felt restorative. Motivation dipped, and even small tasks became overwhelming. When she saw a functional medicine doctor, he asked about her diet and ran a more detailed nutrient panel, revealing low magnesium levels. With a few dietary changes and the right supplement, the fog gradually began to lift.

If you’ve been feeling similarly, it might be worth asking: Could low magnesium be part of the picture? Magnesium plays a key role in mood regulation, yet an estimated 45 percent of people in the United States don’t get enough.

How Magnesium Affects Mood

A large study of more than 13,000 people found a strong connection between magnesium levels and depression. It showed that for every one-point increase in someone’s magnesium depletion score, their risk of depression rose by 13 percent. The magnesium depletion score is a tool that helps identify people who may be low in magnesium by looking at common risk factors such as certain medications, alcohol use, or kidney problems.

Lowering your magnesium depletion score, by improving your diet or addressing risk factors, may help prevent or even ease symptoms of depression.

A meta-analysis published in Nutrition Reviews involving more than 63,000 people found that those with the highest magnesium intake had a 34 percent lower risk of depression compared with those with the lowest levels of intake.

So how exactly is magnesium linked to mood?

Magnesium helps regulate important brain chemicals involved in mood, such as glutamate and gamma-aminobutyric acid (GABA). When levels are low, these systems can become unbalanced, which may make it harder to cope with stress and increase the risk of depression.

“Magnesium plays an important role in supporting the GABA system, essential for relaxation and stress reduction,” Dr. Nathali Morrow, a functional-integrative general practitioner, told The Epoch Times.

Also, if there is a magnesium deficiency, neurons could become damaged, said Sue-Ellen Anderson-Haynes, a registered dietitian and founder of 360Girls&Women B.E.A.T Gestational Diabetes.

“This can manifest as depression,” she said.

Low magnesium can further increase inflammation and oxidative stress, both linked to depression. It may also affect key brain areas such as the amygdala and hypothalamus, which help regulate mood.

Common Causes of Magnesium Depletion

Before exploring treatment options, it’s important to understand what can lower magnesium levels.

Stress is a major factor, Katrina Farrell, a registered nutritional therapist, told The Epoch Times.

“When you’re stressed, whether it’s short-term or ongoing, your body releases magnesium as part of its stress response. This means stress can quickly drain your magnesium stores,” she said.

Put another way, more magnesium is excreted by the kidneys when a person is under stress.

Excessive caffeine consumption, as well as grain refining and food processing, can also deplete magnesium levels. Boiling magnesium-rich foods such as spinach or legumes also results in magnesium loss as the mineral leaches into the cooking water. Choosing raw, whole foods offers a more potent natural source of magnesium, Farrell said.

How Much Magnesium Is Needed Daily

Given magnesium’s effect on mood, getting enough each day really matters.

The Nutrition Reviews meta-analysis found that for every extra 100 milligrams (mg) of magnesium taken daily, the risk of depression dropped by 7 percent. The biggest benefits appeared when intake increased from about 170 mg to 370 mg per day. While these findings suggest that higher intakes may be beneficial, especially for mental health, the National Institutes of Health cautions that magnesium from supplements should not exceed 350 mg per day, as excessive intake can lead to side effects. This limit doesn’t apply to magnesium naturally present in food.

For reference, 1 cup of cooked spinach has about 150 mg of magnesium, 1 ounce of almonds has about 80 mg, and 1/2 cup of black beans has about 60 mg.

Certain forms of magnesium supplements are more bioavailable than others, such as magnesium threonate, glycinate, and citrate.

Using Precision Nutrition to Address Deficiency

While eating magnesium-rich foods and taking supplements can help many people, some need a more tailored approach to address magnesium deficiency—especially when mood issues such as depression are involved. That’s where precision-based nutrition comes in. These newer tools help practitioners go beyond general advice and offer more individualized care.

The following precision-based diagnostic tools don’t treat magnesium deficiency directly, but they help identify underlying imbalances or absorption issues. Once the test results are in, practitioners can use that data to design a precision-based intervention such as adjusting supplement form or dose, addressing co-nutrient deficiencies, or targeting gut health, based on the patient’s unique needs.

Magnesium Depletion Score

Instead of relying on standard blood tests, which don’t reflect how much magnesium is stored in the body, clinicians are using tools such as the magnesium depletion score.

The score accounts for factors such as alcohol use, medications such as proton pump inhibitors or diuretics, diabetes, and kidney function to identify people who are more likely to be low in magnesium, even if their other blood tests are within normal limits.

Personalized Magnesium Supplement Plans

Newer tests, such as the magnesium red blood cell or intracellular magnesium test, can now measure magnesium inside red blood cells, which gives a better picture of long-term status. Based on this data, functional practitioners can tailor both the form and dosage of magnesium to the person’s needs.

Genotype-Guided Nutrition

Some emerging gene tests look at how the body absorbs and uses magnesium. Variations in genes may influence how well a person absorbs or retains magnesium, which could eventually guide more personalized dietary and supplementation strategies.

Microbiome-Informed Recommendations

Since magnesium is absorbed in the gut, stool tests are being used to spot imbalances in the microbiome that might block absorption.

Improving gut health with prebiotics, probiotics, or fermented foods may enhance magnesium absorption and support mood.

Smart Diet Tracking Tools

New applications can flag low magnesium intake by analyzing what you eat.

Some even link nutrient intake with mood changes over time, helping users see how magnesium may be affecting how they feel.