A new drug prevents weight gain and fatty liver by controlling magnesium in cells. It made mice stay slim despite lifelong exposure to an unhealthy diet. Credit: Stock Scientists have unveiled a small-molecule drug that blocks weight gain and liver damage in mice forced to live on sugary, high-fat food. The compound works by limiting magnesium inside mitochondria—the cell’s power plants—so energy keeps burning instead of stalling. Treated mice quickly slim down and show no signs of fatty-liver disease, hinting at a future therapy against obesity, heart trouble, and cancer tied to poor diets. Breakthrough Drug Fights Fat and Liver...