Fiber takes longer to digest and helps extend the energy boost you get from carbs for long-lasting energy. Beans are jam-packed with the stuff. “Fiber also keeps energy levels on an even keel without dips because it helps stabilize blood sugar,” Lakatos and Shames explain. Beans also contain magnesium (close to a third of your recommended daily intake in a cup). “Magnesium helps to relax the body so the body can rest and restore energy,” say Lakatos and Shames. “And it’s the body uses to activate cell enzymes that produce energy.