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Christopher Gaffney, Senior Lecturer in Integrative Physiology, Lancaster University

Bulking and cutting: is it safe for your metabolism?

People may use 'mass gainer' shakes during the bulking phase to help build muscle. Prostock-studio/ Shutterstock

If you’ve ever spent any time online trying to figure out the best way to build muscle or get in shape, you’ve probably come across a celebrity, athlete or fitness influencer somewhere advocating for the “bulking and cutting” method.

While this method certainly isn’t new – indeed, it first became a phenomenon in the 1960s thanks to bodybuilders – it continues to be popular, even among amateurs, because many claim it’s the best dietary method for efficiently building muscle while also losing fat. But this could actually be harmful, especially if followed for a long period of time.

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