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Alli has a different function in your body compared to other weight loss aids. Rather than dulling your appetite, Alli stops your body from absorbing dietary fat. However, along with preventing fat absorption, Alli can also stop–or at least decrease–the absorption of vital vitamins you get from meals. To maintain good health while on the Alli plan, the U.S. Food and Drug Administration stresses the importance of taking a multivitamin.