Caffeine, exercise may help ward off skin cancer

Experiments on mice showed that caffeine and exercise together somehow made them better able to destroy precancerous cells whose DNA had been damaged by ultraviolet-B radiation

One group drank water containing the human equivalent of one or two cups of coffee a day. A second group exercised on a running wheel. A third group exercised and drank the caffeine. A fourth group neither exercised nor drank caffeine.

Both caffeine and exercise alone increased by roughly 100 percent the mice's ability to kill off precancerous cells that could lead to skin cancer compared to the mice that did neither. But the mice that did both showed a nearly 400 percent increase in this ability, the researchers found.