Even a small amount of exercise or other physical activity—about 20 minutes of brisk walking a day—can prolong the lives of sedentary people, suggests a study in the American Journal of Clinical Nutrition of 330,000 Europeans (ages 25 to 70) who were followed for about 12 years. Increasing exercise was associated with reduced mortality rates in people at all activity levels and in all weight categories. But the researchers concluded that the biggest reduction in mortality rate would occur when transitioning from being totally inactive to merely moderately inactive. To accomplish that, all it would take is to burn about 100 calories a day in physical activity.

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