Vitamin B1, also known as THIAMINE, ANEURIN, and thiamin, is an essential nutrient that helps the body convert carbohydrates into energy. It is found in a variety of foods, including whole grains, legumes, nuts, and meat, and is necessary for proper functioning of the nervous system, muscles, and heart. Deficiency of vitamin B1 can lead to a number of health problems, including beriberi, Wernicke-Korsakoff syndrome, and peripheral neuropathy.