The nutritional value that is lost when cooking or overcooking vegetables will depend on the cooking method, and not all nutrients are affected by cooking. Longer cooking will likely result in more nutrient losses for those nutrients that are affected by cooking, but overcooking will not remove all of the nutritional value. Also, cooked vegetables generally taste better when they are not overcooked, which increases the likelihood that they will be consumed.
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The Expert: Dr. Elizabeth Pivonka, a mother of two and a registered dietitian, shares years of experience in getting people to eat more fruits and veggies.Read Her Full Bio