The Checkup: How Cardio Lowers Breast-Cancer Risk

Results of a new study show how exercise may protect against breast cancer.

• Time to hit the elliptical, ladies—a new study may have finally figured out how exercise reduces your breast-cancer risk. But let me back up for a second: Previous studies already pointed to the cancer-risk-decreasing effect of exercise, but until now, no one had any clue how it happened. Ready for this? It appears to have something to do with estrogen. For the study, 400 healthy, inactive women were divided into two groups. The women in one group did absolutely nothing and continued their inactive lifestyle; those in the other, however, did 30 minutes of moderate-to-intense cardio exercise (on an elliptical, treadmill or stair stepper) five times a week for 16 weeks. All the subjects submitted urine samples at the beginning and end of the study. Researchers found that the women who exercised had higher levels of estrogen metabolites in their urine at the study’s end—molecules known to reduce breast cancer risk. So researchers think that exercise changes the way the body metabolizes estrogen, and that process may help shore you up against breast cancer. Fascinating, yes? Read more here.

Have a craving? New research suggests that it’s the calories your body is jonesing for, not the flavor. Here’s why: “Calories trigger responses in areas of the brain that control eating behavior independently of how much the subject likes the flavor,” according to Futurity.org. More here.

Wrigley’s caffeine-laced chewing gum is no more—well, at least for the time being. The company has suspended production of its new energy gum while the FDA investigates the safety of the product. The AP has more.

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