Which deficiency is commonly associated with a vegan diet?

A vegan diet, which excludes all animal products, can lead to a deficiency in vitamin B12 because this vitamin is primarily found in animal-derived foods. Vitamin B12 is vital for the production of red blood cells, DNA synthesis, and the proper functioning of the nervous system. As a result, individuals following a vegan diet must obtain vitamin B12 from fortified foods or supplements to meet their daily requirements.

While it is true that a vegan diet can pose risks for deficiencies in calcium and iron as well, the most significant and common deficiency specifically linked to not consuming animal products is vitamin B12. Unlike the other nutrients mentioned, B12 is not easily obtained from plant sources, which further underscores the importance of awareness regarding this deficiency among those adhering to a vegan lifestyle.