Olestra is a fat substitute that adds no fat, calories, or cholesterol to products.
Olestra may cause abdominal cramping and loose stools. Olestra inhibits the absorption of some vitamins and other nutrients. Vitamins A, D, E, and K have been added. This condition (normally occurring only by excessive consumption in a short period of time) became popularly known as "anal leakage," which can be embarrassing.