In the united states, deficiency is the most common nutritional deficiency.

In united states. Iron deficiency is the most common nutritional deficiency.
Iron deficiency is actually really easy to obtain since it's contained by a lot variation of Green Vegetables.
But in recent years, Average people's diets are focused on high-carbs and high-fat food which do not contain any form of iron in it.

They need to know because sometimes they have a symptom