Add Yahoo as a preferred source to see more of our stories on Google. Want to lose weight? Understanding how calories actually work is key - Julia Lena Morell You may have a pretty good idea of how ...

There's a right—and wrong—way to follow one.

Q: How many calories a day do I need to take in to gain mass and still not gain excess weight? I’m 16 and weigh 180 pounds. I train four or five days a week and have been gaining well over the past ...

With so much talk about how to lose weight, it’s easy to forget that there are people who want to gain weight by building lean muscle mass, or “bulking.” To do this, you need to consume more calories ...

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An icon in the shape of a lightning bolt. Impact Link The Fitbit health and fitness tracker is highly accurate when it comes to logging your daily step count. But according to a series of studies from ...