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I'm not taking it but to me its like Xenical/Orlistat, just not as strong.

Naturally occurring enzymes in your intestines break down the fat from food, so your body can absorb it. The active ingredient in alli prevents the enzymes in your intestines from digesting about a quarter of the fat you eat. Because undigested fat cannot be absorbed, it passes out of your body naturally.
Alli capsules only work on enzymes that break down fat, not on other enzymes. So carbohydrates and proteins are not affected. But, since fat grams have more than twice as many calories as carbs and protein, alli capsules work on the worst offenders — the calorie-dense fat grams. As you limit fat and calories through diet, use alli capsules, and get more physically active, your body will burn stored fat for energy. And that will help you lose weight.
Unlike some other weight loss products, alli only works in your digestive tract. And alli is safe: It's not systemic, so it won't affect your brain or heart. That means it won't cause jitters, sleeplessness, or a racing heart.
http://www.myalli.com/Default.aspx
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