Fiber does two major things in the body that can contribute directly and indirectly to energy. First and foremost, it helps control blood sugar. When your blood sugar is out of control, so is your energy. Low-fiber foods, especially processed carbohydrates that also don’t contain much fat or protein, send your blood sugar rocketing, which, in short order, sets you up for a big fat crash in energy.
A candy bar may give you a rush of blood sugar, but half an hour later you’ll be pinching yourself to keep your eyes open as your blood sugar plummets. On the other hand, eat some beans and your blood sugar will rise slowly and stay up there for a week. (I’m kidding, but you get the point).
