In other words, exposing ourselves to natural light early in the day helps regulate our internal clock so that our system stays balanced from day to night, winter to spring. The infrared light ...

Another fatty fish that is an excellent source of vitamin D is the swordfish. The USDA lists a 100-gram serving as containing ...

The critical link seems to be the relationship between summer light and winter levels of vitamin D. Light stimulates the production of cholecalciferol, which the body eventually transforms into ...