Intermittent Fasting (IF) or cyclic fasting may be a “trendy” style of eating, but it is definitely not new. Many religious rituals require fasting and our nomadic ancestors often went through periods of famine because of lack of food. IF is a type of eating pattern that includes set periods of eating and fasting. So, when to eat is more important than what we eat (within reason). Here’s how it works… When your body doesn’t get enough carbohydrates or calories to use for energy, it will turn to your fat cells to make glucose for energy. As stored fat is broken down, your body produces ketones or ketone bodies as an alternate fuel source when there is not enough glucose present.