When you set out to lose weight, you expect to give up a few of your favorite foods. Donuts? So long. Ice cream? Goodbye. Forgoing grains, fruits, and any sugars, real and artificial, is a whole new level of self-restraint, though.
But it’s par for the course for the keto supplement, a high-fat, low-carb eating plan attracting a lot of attention these days. Basically, the keto diet works by changing your body’s primary fuel source.
When you greatly restrict your carb intake, your body dips into your muscles’ glycogen stores for energy. When those are used up, you lose the fluid that was stored along with the glycogen as well. That leads to pretty rapid fat loss at first—even though it’s mostly water weight.