Diet Drug

The Food and Drug Administration has approved sales of a lower-dose version of Xenical.

That's a diet drug that works by preventing the body from absorbing up to 25% of fat from the food you eat. The non-prescription version of the drug is called "Alli."

Officials stress that it needs to be used in combination with a diet and exercise program -- and that using the pill alone isn't likely to do any good.

Alli is expected to hit store shelves this summer. It is about half the strength of the prescription version.

There is some controversy. Opponents say it may cause a condition that's a precurser to colon cancer.