Experts say cold temperatures could be you new fat-burning hack: How shivering burns calories
Cold exposure and shivering could work as methods to reduce fat levels, but have scientists just poured freezing-cold water on the theory?


As winter settles in, the sane ones among us dread the dropping temperatures and the extra layers of clothing that rustle like a plastic bag full of snakeskins and have impossibly difficult pocket zips. But put your coat away; scientists say there may well be a silver lining to it all: cold exposure and even the act of shivering might help the body burn more calories.
When humans are exposed to cold, the body initiates a heat-producing process known to people who like to read graphs as thermogenesis. Simply put, when external temperatures fall, the body has to work harder to maintain its core temperature. That extra effort requires energy, and energy comes from burning calories.
One of the key players in this process is brown adipose tissue, more commonly called brown fat. Unlike white fat, which mainly stores energy and contributes to excess body weight, brown fat actively burns energy to generate heat.
An arctic fox shedding its winter coat. Arctic foxes are well adapted to the cold, surviving temperatures as low as −50 °C (−58 °F).
— Wonder of Science (@wonderofscience) December 6, 2025
📸: Kevin Morgans pic.twitter.com/jUdYGU3K8M
Though most abundant in infants, adults also retain small amounts of brown fat, especially around the neck and shoulders. Individuals with higher levels of brown fat tend to have leaner body compositions.
Research suggests that exposure to cold temperatures triggers brown fat activity. In turn, this increases calorie expenditure as the body works to stay warm.
Beyond shivering itself, there are other ways cold exposure may benefit metabolism. Some studies indicate that simply lowering room temperatures or taking cold showers can increase brown fat activity and energy expenditure. However, the effects are often modest compared with traditional exercise, which is recommended as a first option over shaking your way to the kitchen for some Christmas pudding.
AccuWeather forecasts for Sunday's game between the Bears and Browns call for a high of 10 degrees, with wind chills around -10. It's expected to be one of the coldest games in Soldier Field history. pic.twitter.com/PpLQiOSJRR
— Chris Emma (@CEmma670) December 10, 2025
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Added to that, cold exposure is not a substitute for a healthy lifestyle. Shivering is an uncomfortable response and prolonged cold stress carries risks such as hypothermia if done irresponsibly. So get your coat, turn the central heating up, and get to the gym.
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