When doing any Rachel Ray diet or process, our body requires energy to run properly and at optimal level. When the body is giving out more energy than it is taking in, such as when exercising, the body's cell rely on internal energy sources, like complex carbohydrates and fats for energy. The first source to body uses is glycogen, where 65% of it is stored in skeletal muscles and the rest in the liver. It is created from the excess of mainly carbohydrates. When the sources of carbs are nearly depleted, the body begins mobilization and catabolism of fat stores for energy. In this process, fats and fat cells are broken down into glycero and fatty acids, which can be used to make energy. The primary by-products of metabolism are carbon dioxide and water, which is expelled/removed through the respiratory system.
Weight loss typically involves fat loss, muscle and water loss. Muscle loss during weight loss can be restricted by regularly lifting weights, and by maintaining sufficient protein intake. On low-carbohydrate diets should typically increase their protein intake. Reducing even 10% of body fat can have a dramatic effect on the person's body shape.