Too little magnesium in one’s diet will make the body work harder. Good sources of magnesium include bran muffins, pumpkin seeds, barley, buckwheat flour, low-fat vanilla yogurt, trail mix, halibut steaks, garbanzo beans, lima beans, and spinach.
Most people think of calcium and phosphorus as the most important dietary components for bone health. But magnesium also plays an important role. It is involved in hundreds of biochemical reactions, many of which help keep not only bones strong, but the heart rhythm healthy and the nervous system functioning smoothly.
A study by the Agricultural Research Service of the U.S. Dept. of Agriculture reveals important findings on the effects of depleted body magnesium levels on energy metabolism. Specifically, it showed that inadequate magnesium is associated with a need for increased oxygen during exercise. They found that during moderate activity, those with low magnesium levels in muscle are likely to use more energy—and therefore to tire more quickly—than those with adequate levels.
After consuming the low-magnesium diet, volunteers showed a significant overall loss of magnesium. They had lowered muscle levels of magnesium, and their red blood cells were at the low end of the normal range.
The data shows that during the low-magnesium-status phase, the postmenopausal volunteers used more oxygen during physical activity, and their heart rates increased by about 10 beats per minute. “When the volunteers were low in magnesium, they needed more energy and more oxygen to do low-level activities than when they were in adequate-magnesium status,” says Lukaski, one of the study authors.
These findings are consistent with other studies showing that too little magnesium makes the body work harder. “The effects are likely to occur in individuals with low magnesium, regardless of whether the person is athletic or sedentary,” says Lukaski. “That means that athletes wouldn’t be able to work or train as long as they would if they had better magnesium levels. People need to eat adequate magnesium to make sure their hearts and muscles are healthy enough to meet the demands of daily living.”
The Recommended Dietary Allowance (RDA) for magnesium for women over age 31 is 320 milligrams (mg) daily and for men over age 31 is 420 mg daily.
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