B1, also known as thiamine, is a water-soluble vitamin that plays a crucial role in energy metabolism. It helps convert carbohydrates into energy and is essential for the proper functioning of the nervous system. Thiamine is found in various foods, including whole grains, legumes, nuts, and meat. A deficiency in thiamine can lead to health issues such as beriberi, which affects the cardiovascular and nervous systems, and Wernicke-Korsakoff syndrome, often associated with chronic alcohol consumption. Ensuring adequate intake of thiamine is important for overall health and well-being.