What is the difference between whole grain and refined grains?

Refined grains are grains that have been processed where typically the germ and the bran have been removed. This process removes nearly 80% of the nutrition from the grain and what is left is, basically, starch. Conversely, a whole grain has not had the germ or bran removed and therefore provides important nutrients and fiber to a diet. Regular daily consumption of whole grains is associated with longer life, where refined grains have been linked with a higher risk of disease.

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