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Can Chilly Rooms Promote Weight Loss? 

By Dr Andrew Weil


Question: I'm wondering if turning the heat down in the winter and turning the air conditioner up in the summer would result in burning more calories and helping with weight control.

Answer: You raise an interesting and timely question. Researchers in Britain have suggested that the obesity epidemic may be due in part to the fact that over the past few decades residents of affluent Western nations have been turning up room temperatures in the winter. The investigators, from University College London, noted that between 1978 and 2008 average living room temperatures in England rose from 64.9 degrees Fahrenheit (18.3 degrees centigrade) to 66.4 F (19.1 C) and bedroom temperatures increased from 59.4 F (15.2 C) to 65.3 F (18.5 C). In the United States, living room temperatures remained stable between 1987 and 2005, but average bedroom temperatures increased from 66.7 F (19.3 C) to 68.4 F (20.2 C).

This warmer environment may have reduced the need for our bodies to burn calories to stay warm, thus contributing to weight gain. The researchers explained that cooler temperatures can activate brown fat, the type of fat that generates body heat. Earlier research suggests that 50 grams of maximally activated brown fat accounts for 20 percent of resting energy. That translates to burning 400 to 500 extra calories per day. The British team said that decreasing room temperature from 71.6 F (22 C) to 60.8 F (16 C) led to the activation of brown fat as demonstrated by positron emission tomography in almost all healthy volunteers tested. The investigators further cited research suggesting that when brown fat is fully activated it could result in calorie burning that would lead to a loss of 8.82 pounds per year.

The British team also considered the issue of whether appetite would be somewhat suppressed at higher temperatures, as earlier studies have shown. But the investigators said that any loss of appetite that occurs in warm room temperatures is unlikely to fully compensate for the reduced energy expenditure of a warm environment.

Turning down the thermostat in winter and turning up the air conditioner in summer might result in some weight loss (of these two choices, the former is better for the environment, as it conserves energy). If that's all you're doing, the amount you'll lose over the course of a year might be nine pounds, if the studies are correct, but don't forget to eat right and exercise regularly if you're serious about losing weight.


Andrew Weil, M.D., is a world-renowned leader and pioneer in the field of integrative medicine, a healing oriented approach to health care which encompasses body, mind, and spirit.
Combining a Harvard education and a lifetime of practicing natural and preventive medicine, Dr. Weil is the founder and director of the Arizona Center for Integrative Medicine (AzCIM) at the University of Arizona Health Sciences Center, in Tucson, where he is also a Clinical Professor of Medicine and Professor of Public Health and the Lovell-Jones Professor of Integrative Rheumatology. DrWeil received both his medical degree and his undergraduate AB degree in biology (botany) from Harvard University.
Dr. Weil is an internationally-recognized expert for his views on leading a healthy lifestyle, his philosophy of healthy aging, and his critique of the future of medicine and health careApproximately 10 million copies of Dr. Weil's books have been sold, including Spontaneous Healing and Why Our Health Matters.

Online, he is the editorial director of drweil.com, the leading web resource for healthy living based on the philosophy of integrative medicine. He can be found on Facebook at facebook.com/DrWeil, Twitter at twitter.com/DrWeil, and Dr. Weil's Daily Health Tips blog at drweilblog.com.


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