Answer: Alcoholics, Vegetarians, Women of childbearing age, Older people who consume poor diets.
Alcoholics tend to have red blood cells that are destroyed before their natural lifespan, because of the amount of alcohol.
Vegetarians avoid a diet that contains meat and fish, which are the best sources of iron. The same goes for older people who consume poor diets.
Women of childbearing age have higher risk of this deficiency because of blood loss during their monthly periods.