People have tried some wild stuff to shed pounds. Cabbage soup. Weird diets. Vibration belts. Sour green smoothies. And, when all else failed, shapewear was everyone’s fallback: squeeze in the stomach and hope nobody notices.Now, scientists have found a fresh twist: wearing ice vests.Yes — that’s right.As reported by The Guardian, in a joint study conducted by researchers at the Leiden University Medical Centre and the University of Nottingham, scientists noticed a more rapid drop in weight amongst 47 people with obesity after wearing an ice vest.Read on to know how the study unfolds and what it reveals.
What does the study say?
A new study at the 2026 European Congress on Obesity claims that regular cold exposure using these vests can activate your body’s calorie-burning system.So, how does this work?The cold kick-starts something called brown fat, which is a rare kind of fat that actually burns calories instead of storing them. Unlike regular white fat, the stuff most of us wish we had less of, brown fat acts like a little furnace trying to keep you warm.In the study, people wearing cooling vests lost body fat over six weeks. No extreme workouts or crash diets required. Just two hours every morning in a chilled vest, answering emails and going about their day.The research, led by teams from Leiden University Medical Center in the Netherlands and the University of Nottingham, studied 47 adults living with overweight or obesity. Half wore ice vests, and wraps cooled to about 15°C for two hours daily.After six weeks, the vest-wearing group lost an average of 0.9 kilograms (nearly two pounds), mostly from body fat. Meanwhile, the control group actually gained weight. Sure, nobody walked out looking like a superhero, but the fact that people lost fat without changing their routines impressed scientists.The secret is brown adipose tissue, which is known as brown fat. Unlike typical fat that just stores energy, brown fat burns calories for heat (thermogenesis). When you get cold, your nervous system switches on brown fat to keep your internal temperature stable, and suddenly your body is running its own little radiator.This kind of fat’s special because it burns glucose and fatty acids, which can help with metabolism, insulin sensitivity, inflammation, and even your heart health. So the implications go way beyond just squeezing into skinny jeans.
Important consideration
However, despite the promising success of the research, experts warn that one shouldn’t start sleeping in their freezer. The weight lost in the study was modest, and it’s not a substitute for exercise, good food, sleep, or any of the usual healthy habits. Think of ice vests as a quirky sidekick for metabolism, not a miracle fix.“These are some of the first results on prolonged cold exposure in people with obesity,” said Dr Mariëtte Boon, the study’s lead author. The vests themselves? Surprisingly simple. Gel-filled packs kept cold overnight in a freezer, worn over thin clothes. They’re similar to gear used by workers or bikers in hot climates, and scientists just wondered if the same trick could help burn energy in colder settings.Now, researchers are gearing up and looking at cold showers. The study in the Netherlands, with 34 women, is testing if a daily icy blast for 90 seconds gives the same results. It might. Cold exposure, whether through showers, swimming, baths, or vests, seems able to trigger thermogenesis and increase calorie-burning, at least a little.But scientists aren’t overselling it. Sure, multiple studies have confirmed that cold activates brown fat and non-shivering thermogenesis. But nobody knows yet if these effects can make a real difference in long-term weight loss out in the real world.It all comes down to human metabolism: age, genes, hormones, climate, body fat, daily habits… all factor into how much brown fat gets activated. Some people naturally have more than others. And there’s caution, too. A sudden heavy cold can be dangerous if you have heart, blood pressure, or lung issues. Experts caution against skipping the crazy ice-bath trends people might see online.In short, no — sitting shirtless in a freezer while munching celery isn’t real medical advice!