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We all know that exercise is good for you, but how good? While previous studies have shown the link between physical activity and a lower risk of premature mortality, the number of years of life expectancy gained among persons with different activity levels has been unclear - until now. In a new study from Harvard-affiliated Brigham and Women's Hospital (BWH), in collaboration with the National Cancer Institute, researchers have quantified how many years of life are gained by being physically active at different levels, among all individuals as well as among various groups having different body mass indexes (BMI).

The basics of how insulin gets glucose into a cell. Includes mechanisms of possible defects in the system.

New guidelines for exercise in pregnancy and postpartum have been published by the American College of Obstetricians and Gynecologists. From the British Journal of Sports Medicine.

AUSTRALIANS are now being advised to exercise for up to one hour a day, up from 30 minutes, because of the higher number of calories we're consuming. At least 60-90 minutes of activity a day are required to prevent weight gain in previously obese people, according to new official dietary guidelines released today.