We get vitamin D from the ultraviolet (UV) rays of the sun, but not all sunlight is equal. The amount of UV rays absorbed depends on where you live, the time of day, the season, whether it's cloudy and if you're using sunscreen. People who live in sunny areas at lower latitudes typically get enough vitamin D compared to people living at higher latitudes, particularly during late fall and winter. WHAT FOOD GIVE US VITAMIN D  Few foods are naturally good sources of vitamin D.

The best food sources for vitamin D are fatty fish including salmon, sardines, cod, tuna and halibut. Many foods, such as some breakfast cereals and milk, are fortified with vitamin D. Milk must contain at least 100 IU of vitamin D per cup, according to federal regulations. The practice of fortifying milk with vitamin D began in the 1930s to prevent rickets, a bone disease that was common in children at the time.…