- Whole grains. These are unrefined grains that haven't had their bran and germ removed by milling. Whole grains are better sources of fiber and other important nutrients, such as selenium, potassium and magnesium. Whole grains are either single foods, such as brown rice and popcorn, or ingredients in products, such as buckwheat in pancakes or whole wheat in bread.
- Refined grains. Refined grains are milled, a process that strips out both the bran and germ to give them a finer texture and extend their shelf life. The refining process also removes many nutrients, including fiber. Refined grains include white flour, white rice, white bread and degermed cornflower. Many breads, cereals, crackers, desserts and pastries are made with refined grains, too.
- Enriched grains. Enriched means that some of the nutrients lost during processing are added back in. Some enriched grains are grains that have lost B vitamins added back in — but not the lost fiber. Fortifying means adding in nutrients that don't occur naturally in the food. Most refined grains are enriched, and many enriched grains also are fortified with other vitamins and minerals, such as folic acid and iron. Some countries require certain refined grains to be enriched. Whole grains may or may not be fortified.
- http://www.mayoclinic.org/healthy-living/nutrition-and-healthy-eating/in-depth/whole-grains/art-20047826
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