Grains are small, hard and edible dry seeds that grow on grass-like plants called cereals.

Whole grains contain fiber. Fiber is a critical component of health.

Whole grains tend to be high in many nutrients, including fiber, B vitamins, magnesium, iron, phosphorus, manganese and selenium.

This also depends on the type of grain. Some grains (like oats and whole wheat) are loaded with nutrients, whereas others (like rice and corn) are not very nutritious, even in their whole form.

Grains are efficient at transforming sunlight, fertilizer, water, and air into macronutrients. The final product is a durable seed, which can be stored for long periods.

They are eaten by humans, and also used to feed and fatten up livestock. Grains can be processed into various different food products.

Today, the most commonly produced and consumed grains are corn, rice, and wheat. Other grains that are consumed in smaller amounts include barley, oats, sorghum, millet, rye and several others.