Our hearts beat around 100,000 times a day—and do so throughout our entire lives. They draw the energy for this from the ...

Every movement your body makes depends on a microscopic chemical balance within individual cells. Researchers at the University of Wisconsin-Madison developed a high-sensitivity method to analyze ...

The flow of water within a muscle fiber may dictate how quickly muscle can contract, according to a new study. The flow of water within a muscle fiber may dictate how quickly muscle can contract, ...

Medically reviewed by Kayla Girgen, RD Muscle gain requires both resistance training and eating enough of the right foods to ...

The trillions of microbes living in the human gut are increasingly recognized as important partners in human health.

A single species of gut bacterium, one that thrives on the fiber-rich foods central to the Mediterranean diet, boosted ...

Let’s get one thing straight: Muscle is muscle. Despite what many fitness influencers may have you believe, there’s no such thing as "lean muscle" or "bulk muscle." It’s all made from the same stuff.