Thanks to something called “set point theory,” your body wants to stay at the same weight. This is a survival thing. Once upon a time that layer of jiggle was insurance for leaner times ahead. If you cut calories drastically, your metabolism stalls out. Burchett says this is why it’s important to trim calories with care. You need to make sure you’re not sending your body into a panic. And keep exercising and building muscle, both of which can boost metabolism.
Even if you do everything right, expect to hit a few plateaus along the way. Burchett says the best thing to do is to wait them out. His advice is to stay at your plateau weight for six months — maintaining, but easing up on your effort — to reset your metabolism, then restarting the dieting process again.