Forget lathering on the sunscreen. Taking a run and cooling off with an ice coffee may be enough to prevent skin cancer, a new study says.
The study specifically examined UVB apoptosis — the programmed death of cells that become damaged by ultraviolet rays – in hairless mice. This sort of cell-suicide helps prevent the formation of deadly melanoma skin cancer
For the study, the mice were divided into four groups. The first group drank the human equivalent of one or two cups of coffee per day. The second group had regular exercise on a running wheel. The third had both caffeine and exercise, and a fourth group had none of either.
Researchers said they were surprised to find that the rate of cell suicide was 400 percent greater in mice that both drank caffeine and exercised, when compared to the control group. When combined, caffeine and exercise also “markedly” decreased tissue fat in the mice, the researchers said.
Separately, caffeine and exercise also appeared to help speed-up this type of cell death. Mice that only drank coffee, for example, had 95 percent increase in UVB-induced apoptosis, and those that only exercised showed a 120 percent increase.
The study is published in the July 31 edition of Proceedings of the National Academy of Sciences.
Americans suffer a million new cases of skin cancer every year, according to the National Cancer Institute.
In mice there is a protective effect from both caffeine and voluntary exercise, and when both are provided -- not necessarily at the same time -- protection is even more than the sum of the two, said Dr. Allan H. Conney of the laboratory for cancer research at Rutgers.
"We think it likely that this will extrapolate to humans, but that has to be tested," Conney said in a telephone interview.
The Associated Press contributed to this story