When your carbohydrate intake is minimal, you enter ketosis. As your body breaks down fat, it generates an acid known as ketones or ketone bodies, which serves as the primary source of energy for your body and brain. Because ketosis changes your metabolism and relies on fat for energy, your body may burn fat more quickly. That's why it's important not to cut out carbohydrates entirely because then your body won't be able to switch over to using fat instead. In fact, according to some experts, being in ketosis is beneficial for reducing weight loss barriers. "During the early stages of a ketogenic diet, people often report a feeling of euphoria after eating only fats for several days", says Dr. Josh Axe. He goes on to say that this is probably due to the high levels of ketones in the blood causing improved moods and mental clarity. In addition, researchers have found that ketones play a role in protecting against cancer and heart disease. With all of these benefits, it's no wonder why scientists are continuing to study this diet and its effects on the body.