Essentially, anytime you consume food, your body converts the food into sugar, or glucose. This intake of food and rise in glucose levels leads to an immediate energy rush, followed by an inevitable energy crash, as eventually you feel lethargic, tired, and may even experience headaches after eating high-sugar or highly-processed foods. Unlike most foods, however, Oatmeal has the opposite glucose-rising effect on the body. As Oatmeal's fiber content allows the body to digest this food more slowly, the body does not react to this intake of food by instantly producing glucose and energy; on the contrary, Oatmeal keeps the blood sugar levels more stable, as a steady amount of glucose is released at a steady and safe rate. As a result, you'll feel less fatigued after consuming this fat burning food, and you'll also be less likely to run into an energy crash later in the day.