Water-soluble vitamins were collectively called water soluble B in the beginning. When more water-soluble vitamins were discovered, they were referred to as B1, B2, B6, B12 and so on. Later when more vitamins were discovered in both the categories, they were referred as vitamins C, D, E and K. Now, most are known by a word that indicates either chemical nature or function. Some vitamins are synthesized in the body itself by intestinal micro-organisms. Antibiotics and sulfa drugs may destroy these organisms resulting in decreased vitamin synthesis. There are other bacteria which when present in the intestine utilize dietary vitamins for their own use thus causing vitamin deficiency.Vitamins in the diet are bound to protein and fat. During digestion, they get broken down and absorbed. Vitamins present in undigested food are not available to the body. The body requirement of vitamins depends upon several factors. Apart from those mentioned above, people suffering from tuberculosis or high fever require more vitamins and people living in high altitudes and cold regions also have increased vitamin requirement.The B vitamins have a wide and varied range of functions in the human body. Most B vitamins are involved in the process of converting blood sugar into energy. Diets rich in B vitamins are particularly important for pregnant and breast-feeding women and for other people who require more energy, such as athletes and heavy-labor workers.General Deficiencies of Vitamin BDeficiencies of B vitamins are uncommon in the U.S., but when they occur, they usually involve several B vitamins, since many of them come from the same food groups. Alcohol interferes with these vitamins, and some of the physical and mental problems that alcoholics experience may be attributed to a deficiency of B vitamins. Elderly people are also at risk for deficiencies, because of inadequate diets and potential interference with B-vitamin absorption by med...
