While nutrient loss does occur after a fruit or vegetable loses its protective peel or skin (e.g., has been cut into), the loss does not occur immediately. It may take up to a few days for any major vitamin and/or mineral loss to occur. It is recommended that fruits and vegetables be stored intact until you are going to use them to keep them fresh and prevent any nutrient loss.
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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