Vitamin B1, also known as thiamine, is a water-soluble vitamin that plays a crucial role in energy metabolism. It helps convert carbohydrates into energy, which is essential for the proper functioning of the body's cells. Thiamine is also important for nerve function and supports the health of the heart and muscles. This vitamin can be found in various foods, including whole grains, legumes, nuts, and meat, particularly pork. 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.