Strength training programs for young people can improve muscle tone, prevent obesity and develop good exercise habits that last into adulthood.

Months not eating or moving don’t result in muscle wasting and loss of function for animals that hibernate. New research found gut microbes help their hosts hold onto and use nitrogen to build proteins.

Loss of muscle mass is a growing concern for the tens of millions of older Americans. It leads to falls and increased isolation, already a huge problem during coronavirus.

There are some factors you can't change about your metabolism. But there are things you can do to influence how much energy your body uses over the course of the day.