A dietary supplement significantly reduced high blood sugar caused by a diuretic used to lower blood pressure while also correcting electrolyte imbalances. Millions of Americans take thiazide diuretics, a class of medications used to treat high blood pressure. Although these drugs are very effective, Dr. Vongpatanasin said, they come with significant side effects, including reduced levels of the electrolyte potassium in the blood; higher cholesterol, triglycerides, and other circulating lipids; and elevated glucose (blood sugar), a precursor to Type 2 diabetes. The increase in glucose prompted by these drugs has long been attributed to the decrease in potassium levels. Although...