Paging Dr. Oz
"They're not dangerous for you," Dr. Oz says, but he offers a caution. "It's a synthetic product you're putting in your body. The nice thing about them, actually, is they keep you honest. If you eat a really fatty food, when you go to the bathroom, it looks like an oil spill. ... The way they these products work is they prevent your intestines from absorbing fat. They're supposed to get you trained to have less fat coming through your diet."
If you do rely on foods cooked in these synthetic fats to lose weight, Dr. Oz says, you need to eat plenty of colorful fruits and vegetables to replenish the vitamins A and E that are being blocked from your body.