Refined grains are grains that have been processed to remove the bran and germ, leaving mostly the starchy endosperm. This process gives refined grains a finer texture and extends their shelf life, but it also removes important nutrients and fiber. Common examples of refined grains include white bread, white rice, and many types of pasta. While refined grains are often enriched with some vitamins and minerals, they typically lack the full nutritional benefits of whole grains, which retain all parts of the grain. Consuming too many refined grains can lead to health issues, such as increased blood sugar levels and a higher risk of heart disease.