The longer a fruit is exposed to air and light, the less vitamins and nutrients it will have.  So as sweet as the old brown fruit may seem, it may not be worth it with the added sugar content and lost nutrients.

Other things that can deplete nutrients besides light and air include:  Cooking, deep frying and canned fruits and fruit juices that are heated during processing.

Frozen fruits retain their nutrient content much longer than fresh, according to Holford, author of The New Optimum Nutrition Bible.

Fresh fruit should be consumed within a few days of purchase for optimal nutritional value.  This is why it is so important that the produce you buy from the grocery is fresh.  It also gives reasoning to buying local (less time from the farm to mouth, plus less cost to the distributing companies and less negative impact to the environment).

Read more: http://www.livestrong.com/article/547675-does-fruit-lose-nutrients-in-oxidation/#ixzz1zrxCrIzo