alli works by blocking the absorption of about 25% of fat in the foods you eat, leading to a 5% to 10% weight loss over time. alli met the rigorous FDA standards for a weight loss product. Clinical trials with alli have consistently shown it to be more effective than diet alone. alli can help people lose 50% more weight than with dieting alone. This means that if you could lose 10 pounds with a diet, you could lose 15 pounds working with alli. 

See Orlistat alli and Xenical diet pills review for more information.