Brr! Can Frigid Temps Lead to Weight Loss?

Author Tim Ferriss said cold temps boost the body's metabolism.

ByABC News
December 15, 2010, 10:47 AM

Dec. 15, 2010— -- Finally, an upside to the frigid temperatures that have gripped much of the nation -- all the shivering could help shed a few pounds.

"The body wants to maintain a balance, a homeostasis of 98.6 degrees," said author Tim Ferriss, who promotes this type of "thermal dieting." "If you make it cold, the body will do everything it can to get back to 98.6. And it has to burn calories to do that -- heat equals calories."

Ferriss, the best-selling author behind "The 4-Hour Workweek" and the just-released "The 4-Hour Body," is known for his lessons on how to manipulate the body to your advantage.

Using winter to lose that winter weight is just one example. He said people can burn up to 50 percent more calories by exposing themselves to below-freezing temperatures, which causes the body to work overtime.

"There's actually a type of fat called brown adipose tissue -- BAT," he said. "Cold can trigger this BAT. It actually produces heat, and you burn fat tissue."

Ferriss' advice is backed by science.

"We can use the thermal environment to supercharge our weight loss," said former NASA scientist and entrepreneur Ray Cronise.

Cronise has researched the effects of temperature on astronauts and said there is evidence that cold can go a long way in speeding up a person's metabolism.

"In environments as mild as 60 degrees, some of these people saw metabolism rates boost by as much as 20 percent," he said.

But Dr. David Katz, director and founder of the Integrative Medicine Center and professor at Yale University, was doubtful and said if people were really that desperate to lose weight, they should just try diet and exercise.

He also warned that exposure to extreme cold, especially through ice baths, could cause complications in people with cardiovascular problems or even induce cardiac arrhythmia in those at risk. Ferriss himself also notes in his book that readers should consult a physician before attempting some of these techniques.