There are a number of different types of grains found within the true cereal grains which are from the botanical family 'Poaceae' including wheat, oats, rice, corn (maize), barley, sorghum, rye, and millet.

The healthiest bread has the highest proportion of whole grains. And such whole-grain bread contains nutrient-rich germ and bran. So, for example, twelve-grain bread is a more nutritious option because it offers more dietary fibre, heart-healthy seeds, and less processed, higher-quality carbs.

Around the globe, grains, also called cereals, are the most important staple food. Humans get an average of 48 percent of their calories, or food energy, from grains. Grains are also used to feed livestock and to manufacture some cooking oils, fuels, cosmetics, and alcohols.