Exercise triggers the release of irisin, a natural hormone that may help convert white fat to calorie-burning brown fat, improving metabolism and lowering diabetes risk. Brown fat burns energy, while white fat stores it. Cold exposure, genetic factors, and irisin may promote this fat transformation. Increasing brown fat could be a breakthrough for weight loss and metabolic health.

Vitamin D insufficiency has reached epidemic proportions and has been linked to low bone mineral density, increased risk of fracture, and...