Researchers have found that fish oil transforms fat-storage cells into fat-burning cells, which may reduce weight gain in middle age. The team explains in Scientific Reports that fish oil activates receptors in the digestive tract, fires the sympathetic nervous system, and induces storage cells to metabolize fat. Fat tissues don’t all store fat. So-called “white” cells store fat in order to maintain energy supply, while “brown” cells metabolize fat to maintain a stable body temperature.…