Vitamins are not always harmless, and some can cause severe and life-threatening adverse effects. Vitamins are often classified as fat-soluble or water-soluble. The kidneys remove water-soluble vitamins if you eat too much in a day. They don't collect in your body, and toxicity only occurs if you take enormous amounts. Water-soluble vitamins The liver is importantly involved in vitamin metabolism. The liver produces bile for absorption of fat-soluble vitamins (A, D, E, K), and the liver is an important site for vitamin storage. Vitamin A is stored in both stellate cells and hepatocytes. Approximately 95% of total body vitamin A is stored in the liver, representing a 1- to 2-year Orlistat (Alli, Xenical), a weight-loss treatment, can decrease the absorption of vitamin A, other fat-soluble vitamins, and beta-carotene, resulting in low plasma levels in some patients [84,85]. The manufacturers of Alli and Xenical recommend that patients on orlistat take a multivitamin supplement containing vitamin A and beta-carotene as A) most of them are synthesized by intestinal bacteria. B) intestinal transport occurs by way of the portal circulation. C) deficiency symptoms may take years to develop on a poor diet. D) toxicity risk is higher for vitamins E and K than for other fat-soluble vitamins. deficiency symptoms may take years to develop on a poor diet. Vitamin E is one of four fat-soluble vitamins, and it is essential for your health. As an antioxidant, it protects and maintains cell membrane integrity. It fights against unstable molecules in cell division known as free radicals and against oxidative stress (an imbalance between free radicals and antioxidants in the body). The function of Vitamins are vital micronutrients that cannot be synthesized endogenously or in insufficient amounts, and the principal means by which we get vitamins is through our diet. Vitamins can classify as water-soluble or fat-soluble. The fat-soluble vitamins include vitamins A, D, E, and K. Fat-soluble vitamins play integral roles in a multitude of physiological processes such as vision, bone health TLKXwH7. Zinc deficiency symptoms can include skin lesions, increased susceptibility to infection, diarrhea, poor appetite, night blindness, reduced taste and smell acuity, hair loss, low sperm count, impotence, and slow wound healing [5, 22]. In the developing countries, zinc deficiency is considered one of the main causes of morbidity . Vitamins A, D, and K are fat-soluble vitamins that perform a number of essential functions. Adequate intake of vitamin A prevents blindness; vitamin D, rickets; and vitamin K, excessive bleeding. Although adequate intake of all three vitamins is possible with a balanced, varied meal pattern, some people benefit from supplementation. Studies also show a vitamin A deficiency is linked to emphysema and other respiratory diseases, including childhood asthma. Therefore, supplementation of vitamin A is recommended in high-risk populations to treat and prevent lung diseases. Other symptoms of a vitamin A deficiency include: Fatigue. Increased infections. List two distinguishing characteristics of fat-soluble vitamins. - do not dissolve in water - dissolve in fatty tissues - absorbed with fat - excess IS stored in body (in fats and liver) - deficiencies take longer to develop, but greater risk of toxicity Eight of the water-soluble vitamins are known as the vitamin B-complex group: thiamin (vitamin B1), riboflavin (vitamin B2), niacin (vitamin B3), vitamin B6 (pyridoxine), folate (folic acid), vitamin B12, biotin and pantothenic acid. The B vitamins are widely distributed in foods, and their influence is felt in many parts of the body.

deficiency symptoms of fat soluble vitamins