VITAMIN E IN FOODS
Good food sources of Vitamin E include plant oils (e.g., cottonseed, canola, safflower, and sunflower oils), wheat germ, asparagus, almonds, peanuts, and sunflower seeds. Animal fats and dairy products contain little vitamin E….
Most scientists classify vitamin D as a vitamin. However, in the presence of sunlight, skin cells can synthesize a sufficient supply of vitamin D from a derivate of cholesterol. Because a dietary source is not required if synthesis is adequate to meet the needs, the vitamin is more correctly classified as a “conditional” vitamin, or prohormone (a precursor or an active hormone). In the absence of UV light exposure, an adequate dietary intake of vitamin D is essential to prevent the deficiency diseases rickets and osteomalacia and to provide for cellular needs….
Vitamin A refers to the preformed retinoids and provitamin A carotenoids that can be converted to vitamin A activity. Retinoids is a collective term for the biologically active forms of vitamin A, and they exist in 3 forms: retinol, retinal, and retinoic acid.
Vitamin A is categorized as a fat-soluble vitamin. Fat-soluble vitamins are absorbed along with dietary fat. Thus, adequate absorption of fat-soluble vitamins depends on the efficient use of bile and pancreatic lipase in the small intestine to digest dietary fat. Under optimal conditions, about 40 ro 90% if the fat-soluble vitamins are absorbed when they’re consumed in recommended amounts….