While fats can be a better source, this transition can leave many consumers feeling overly hungry and tired at the beginning. No-cook lazy keto lets you skip it — and that’s fine with the doc. “When you keep carbs low and eat real foods, everything else tends to fall in place,” he notes. “As carb intake comes down, blood sugar naturally drops and your body needs a new energy source. It starts turning fat from fat cells and food into compounds called ketones that become your fuel.” Fat burn accelerates.