As you fast, your body uses its energy to cleanse itself. Many people believe that fasting can make you more energetic, enable you to think more clearly, and in- crease your sense of well-being and happiness. There are many types of fasts, from total abstinence of food to eating only certain types of foods or juices. A fast can last for a few hours or for a day or more. People who fast usually drink water or juice to keep their bodies properly hydrated. Because so many debilitating diseases are related to food over consumption and diets that are high in processed foods, sugar, and other less-than-nutritious ingredients, consider undertaking a fast to detoxify and rejuvenate yourself. Before starting, however, check with your physician to make sure a fast would be a good idea for you.