My wife thinks I keep the temperature too cold as it is. I don't think she'd be a fan of this line of research.
The mild cold exposure he advocates might be as simple as forgoing a jacket when you’re waffling over whether you need one, not layering cardigans over flannels despite the insistence of the fall catalogs, or turning off the space heater under your desk. And if you don’t want to annihilate the environment by running the air conditioner to get a taste of sweet, calorie-burning, metabolism-enhancing cold in the summer, there are devices like the ice vest, which really isn’t as terrible as it sounds.
“The first time you put it on, it’s a bit shocking, to be honest,” Wayne Hayes, the vest’s inventor, warned me. “You feel like, Holy shit, this is cold.” But after wearing it a few times, he said, most people barely notice they have it on. That was my experience. (Hayes’s wife has become so used to the vest that she wears it under her clothes instead of over them.) Hayes recommends wearing the vest twice a day until the ice melts—which can take an hour or longer—though he has himself worn it as many as three or four times in a single day.