The discovery of vitamin D early in the 20th century eventually led to several important discoveries that have changed how nutritionists look at vitamins. Most importantly, under ideal circumstances of sun exposure, the human body can make all the vitamin D it needs without help from the diet. But, the amount of vitamin D produced in the body depends on the length of time and the amount of skin exposed to ultraviolet B sunlight – too little sunlight, too little vitamin D…Download to read the entire chapter
