Everyone is different – some gain weight after every indulgence, and some can eat like a growing teenager without putting on a single pound. It is true that metabolism is in some way determined by genetics; it is, however, a myth that the body’s metabolic rate can’t change. According to “eatright,” you can give your metabolism the necessary boost by increasing lean muscle mass. So, pick up those weights and build some lean muscle this summer. Click here to bust more metabolism myths.