Any fiber supplement (like Benefiber) absorbs fat from foods and lets you feel fuller, longer. Mark Hyman, M.D., suggests PGX, also known as PolyGlycopleX or konjac root. "This special superfiber is very viscous and soaks up fat, sugar, and water in the gut," says Hyman, author of Ultrametabolism: The Simple Plan for Automatic Weight Loss. "It's a uniquely powerful, safe way to promote weight loss." Hyman advises taking two to four capsules before every meal.