Exercise + melatonin = healthy breasts

Working out seems to protect against breast cancer, though no one's sure why. The answer may lie in the hormone melatonin, which appears to slow cancer growth and increase immunity. In a study of 213 women, Canadian researchers found that the longer a woman exercised, no matter what the intensity, the higher her melatonin levels rose the following night. "We know exercise helps you sleep better. We know it helps protect against breast cancer. Now we suspect it's all connected," says study author Julia Knight, PhD. Exercising after 4 PM provided the biggest melatonin boost.

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By Selene Yeager

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