Fiber is the portion of plant cells not digested in the human small intestine. Benefits of fiber consumption have been documented in treatment of obesity and obesity-related risk factors. In the last century carbohydrate intake and, thus, fiber intake have declined in the U.S. diet at the same time obesity has increased. Higher fiber intake can be achieved by adding high fiber foods or supplements to the diet. A combination of water soluble and water insoluble fiber sources offer the greatest health and weight control benefits. A high fiber weight-reducing diet is most beneficial as part of a lifestyle modification program for weight management.