Normal-weight women who want to prevent weight gain as they age need to do an hour a day of moderate-intensity physical activity such as brisk walking.
Over the years, some experts have suggested it takes that much to control weight, but this is one of the first large-scale studies to examine the question.
It's possible to get the health benefits of physical activity, such as lowering the risk of heart disease, some types of cancers and type 2 diabetes, by following the government
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