Which B-vitamin is associated with energy metabolism and is often found in whole grains?

The B-vitamin linked to energy metabolism and commonly found in whole grains is Vitamin B1, also known as Thiamine. Thiamine plays a crucial role in converting carbohydrates into energy, which is essential for maintaining proper energy levels in the body. It acts as a coenzyme in the metabolism of nutrients, assisting in the breakdown of glucose. Whole grains, which are less processed and retain more of their natural nutrients, are particularly rich in Thiamine compared to refined grains.

While other B vitamins like B2 (Riboflavin) and B3 (Niacin) also contribute to energy metabolism, they are not as specifically associated with whole grains as Thiamine. Vitamin B12, on the other hand, is primarily found in animal products and is vital for nerve health and red blood cell formation, but is not directly linked to energy metabolism in the same way as Thiamine. Therefore, Thiamine is the most appropriate answer when considering a B-vitamin that significantly impacts energy metabolism and is associated with whole grains.