Cool Down To Slim Down

LOS ANGELES (CBS) — A new book says keeping weight off could be as easy as an ice bath.

Tim Ferriss, author of "The 4-Hour Body," says an ice bath three times a week for about 15 minutes will keep those unwanted pounds off.

"So your body wants to be at 98.6 degrees and if your body temperature is lower it will do almost everything it can to get back to the 98.6 degreess and it burns calories as heat and most of the calories come from fat. The body burns more fat to make itself warmer, the lower your body temperature you're going to burn more fat," says Ferriss.

Ferriss says his chilly method was discovered by accident. He says, " I was using ice baths initially for sports recovery and I noticed accelerated fat loss."

Doctors say introducing cold into a weight loss regimen could be dangers. They say cold can affect people with heart conditions and is not good for everyone.