أي مريض أكثر عرضة لنقص فيتامين B12؟

Which client is most at risk of vitamin B12 deficiency?

1. One who eats meat and eggs daily
2. One taking metformin for many years
3. One who exercises regularly
4. One taking iron tablets for a month

Answer: B) One taking metformin for many years. Long-term metformin, strict vegan diets, gastrectomy and long-term acid suppression raise the risk of B12 deficiency.