test. reporter: why would anyone want to walk outside in the bitter cold like this? we re doing it in the name of weight loss. we re going to get sick. reporter: we re trying thermal dieting. a new understanding of how cool temperatures can melt pounds. we are below freezing now, we can certainly feel it. what does that mean for us? how many extra calories are we burning because of this cold weather? we re burning at least 50% more calories. reporter: seem too good to be true? author tim ferriss says the body has to work overtime to overcome the cold. the body wants to maintain a balance. a homeostasis. if you make it cold it will do everything it can to get to 98.6. and it has to burn calories to do that. heat equals calories. what is going on in your body? there s actually a type of fat called brown adipose tissue, b.a.t. cold can trigger this b.a.t.,
andrea canning put it to the test. reporter: why would anyone want to walk outside in the bitter cold like this? we re doing it in the name of weight loss. we re going to get sick. reporter: we re trying thermal dieting. a new understanding of how cool temperatures can melt pounds. we are below freezing now, we can certainly feel it. what does that mean for us? how many extra calories are we burning because of this cold weather? we re burning at least 50% more calories. reporter: seem too good to be true? author tim ferriss says the body has to work overtime to overcome the cold. the body wants to maintain a balance. a homeostasis. if you make it cold it will do everything it can to get to 98.6. and it has to burn calories to do that. heat equals calories. what is going on in your
sleep well, on the wings of lunesta. and here some are stories to watch today on abc news. wikileaks founder julian assange finds out today if he ll be granted bail after his arrest on sex assault charges. meanwhile in washington, lawmakers will discuss the sensitive information exposed by his website. a soyuz spacecraft blasted off this morning from kazakhstan, taking astronauts from russia, the u.s. and italy to the international space station. after 25 years larry king signs off for the last time tonight. the talk show premiered on cnn back in 1985. finally, some people will go to any length to lose weight. there are surgeries, fad diets and the traditional way, sweating off the pounds. now you can drop the pounds by dropping the temperature. it s called thermal dieting.
sleep well, on the wings of lunesta. and here some are stories to watch today on abc news. wikileaks founder julian assange finds out today if he ll be granted bail after his arrest on sex assault charges. meanwhile in washington, lawmakers will discuss the sensitive information exposed by his website. a soyuz spacecraft blasted off this morning from kazakhstan, taking astronauts from russia, the u.s. and italy to the international space station. after 25 years larry king signs off for the last time tonight. the talk show premiered on cnn back in 1985. finally, some people will go to any length to lose weight. there are surgeries, fad diets and the traditional way, sweating off the pounds. now you can drop the pounds by dropping the temperature. it s called thermal dieting. andrea canning put it to the