Fight Fat with Heat?
People who live in well-heated homes above 73.4 degrees Fahrenheit (23 degrees Celsius) are less likely to be obese, or have a high body mass index, compared with individuals who keep their dwellings cooler. People may eat less and burn more energy when residing in a warmer indoor environment. At temperatures above 73.4 degrees Fahrenheit, heat must be lost to maintain a constant body temperature and this process (such as sweating) requires energy. Coupled with decreased appetite and food intake, the additional energy expenditure could lead to weight loss.
Obesity, November 2013