Researchers say daily exposure to cold activates brown fat and could help speed up body’s burning of calories Researchers say daily exposure to cold activates brown fat and could help speed up body’s burning of calories Wearing an ice vest or taking daily cold showers could help people lose weight, according to researchers. Despite the growing popularity of cold-water swimming and freezing plunges, to date there is minimal data on the health benefits of cold exposure. But a study of 47 adults