4 min readIn the United States, while certain vitamin and mineral deficiencies are uncommon, others are notably prevalent and can significantly affect health. When weighing magnesium against vitamin D deficiencies, both are critical nutrients that many individuals lack.
Meet the experts: Kathleen Garcia-Benson, R.D.N., C.S.S.D., C.P.T., a registered dietitian nutritionist at VNutrition; Stephanie Crabtree, M.S., R.D., a holistic registered dietitian from Venice, FL.
“While vitamin D deficiency is frequently diagnosed in the U.S., low magnesium levels are also widespread and often overlooked,” notes Kathleen Garcia-Benson. This article explores essential insights on these micronutrient deficiencies and their interconnection.
How common is magnesium deficiency?
The Cleveland Clinic reports that although only about 2% of healthy adults show significant magnesium deficiency symptoms, insufficient magnesium intake—defined as consuming less than the recommended 310 to 420 milligrams (mg) daily—is much more prevalent. “Over half of Americans fail to meet their magnesium needs through food,” states Stephanie Crabtree. Many people do not consume enough magnesium-rich whole foods, particularly as processed diets take precedence.
Moreover, research suggests that contemporary agricultural and processing methods have significantly depleted the magnesium content in traditionally magnesium-rich foods, complicating dietary intake.
“Chronic stress raises the body’s magnesium requirements, which is concerning given the prevalence of stress in modern life,” adds Crabtree. Garcia-Benson also points out that common medications like diuretics, antibiotics, and proton pump inhibitors can lead to magnesium loss, further elevating the need for this essential mineral.
Concern over magnesium deficiency is warranted, as the National Institutes of Health (NIH) highlights magnesium’s crucial roles in regulating blood pressure and blood sugar levels, boosting energy production, and aiding muscle and nerve function. Symptoms of low magnesium may include muscle cramps, anxiety, irregular heartbeats, headaches, and sleep disturbances.
How common is vitamin D deficiency?
Approximately 35% of American adults are vitamin D deficient, according to the Cleveland Clinic. “Vitamin D insufficiency is prevalent due to our geographical locations and lifestyle choices,” states Crabtree. Vitamin D can be obtained in three ways: through sunlight, dietary sources, and supplements. While sunlight is the ideal source, it can be challenging to fulfill the body’s needs, especially in northern regions during winter months when UVB rays are inadequate for vitamin D synthesis. Additionally, indoor lifestyles, sun protection practices, and darker skin tones can hinder vitamin D production from sunlight. “As a result, many rely more on dietary sources and supplements,” Crabtree explains.
However, naturally occurring vitamin D is relatively sparse in most foods. According to the NIH, the best sources include cod liver oil, fatty fish, certain mushrooms, and eggs. Consequently, many people turn to fortified foods like milk and cereals, which may offer less than 20% of the recommended daily intake of 15 micrograms (mcg) per serving.
Potential symptoms of vitamin D deficiency may include fatigue, excessive sweating, joint pain, and signs of bone fragility, such as falls or fractures, or diagnoses like osteopenia or osteoporosis.
The link between magnesium and vitamin D deficiency
Magnesium and vitamin D deficiencies are interdependent, with one often exacerbating the other. “Magnesium is essential for the activation of vitamin D,” explains Garcia-Benson. “Without adequate magnesium, vitamin D may not work effectively.” A study in the Clinical Kidney Journal found that magnesium deficiency can lead to decreased vitamin D levels in the body.
“This may explain why vitamin D levels do not always increase as anticipated from supplementation alone,” notes Crabtree. To effectively correct a vitamin D deficiency, addressing magnesium levels is equally important. “Ensuring adequate magnesium intake is vital for the body’s utilization of vitamin D,” explains Crabtree.
What to do if you suspect a deficiency
If you suspect that you are deficient in magnesium or vitamin D, whether due to symptoms or low intake of magnesium-rich foods (like nuts, seeds, legumes, and leafy greens) or minimal sun exposure, Crabtree suggests consulting your healthcare provider. They can order the necessary tests. “Vitamin D levels can be directly measured,” she clarifies. “Assessing magnesium status through bloodwork is more complicated. Standard tests may not accurately reflect magnesium levels, and specialized tests like RBC (red blood cell) magnesium might be required.” From there, the best strategy can be developed, potentially involving both supplements and dietary changes. Tailored guidance will expedite your results.
Dietary supplements are designed to complement diets, not substitute for medicine or treatment for diseases. Extreme caution should be exercised when considering supplements for pregnant or nursing individuals, as well as children unless advised otherwise by a healthcare professional.
