No! It’s a common myth that the body will start metabolizing muscle as soon as you enter a fasted state. You’d have to fast for quite a long time for that to happen. During a fast, your body will use up your fat stores 4 (that’s a big reason they exist, to get you through a famine!) and break down damaged bits of protein and cells for fuel (autophagy). During a modified fast, you’ll also be eating enough protein and micronutrients to maintain muscle tissue. [caption id="attachment_126039" align="aligncenter" width="300"] Your fat stores get used up while fasting, not muscle. In fact, our protein powders help your muscles keep building![/caption]