Magnesium helps control blood sugar and pressure, and doctors in one study wanted to see if magnesium could improve insulin sensitivity and blood pressure in healthy overweight people.
About 150 overweight, non-diabetic people took 300 mg of elemental magnesium per day or a placebo for 12 weeks. While insulin sensitivity did not change, magnesium lowered blood pressure in those with higher blood pressure.
Compared to placebo, magnesium decreased peak (systolic) blood pressure by more than two times and resting (diastolic) blood pressure by more than four times.
Reference: Nutrition, Metabolism & Cardiovascular Diseases; April 7, 2009, Electronic Pre-Publication.
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