If you exercise to improve your metabolism and prevent diabetes, you may want to avoid antioxidants like vitamins C and E. That is the message of a surprising new look at the body’s reaction to exercise, reported on Monday by researchers in Germany and Boston. Exercise is known to have many beneficial effects on health, including on the body’s sensitivity to insulin. ‘Get more exercise’ is often among the first recommendations given by doctors to people at risk of diabetes. But exercise makes the muscle cells metabolize glucose, by combining its carbon atoms with oxygen and extracting the energy that is released. In the process, some highly reactive oxygen molecules escape and make chemical attacks on anything in sight. These reactive oxygen compounds are known to damage the body’s tissues. The amount of oxidative damage increases with age, and according to one theory of aging it is a major cause of the body’s decline. The body has its own defense system for combating oxidative damage, but it does not always do enough. So antioxidants, which mop up the reactive oxygen compounds, may seem like a logical solution. The researchers, led by Dr. Michael Ristow, […]