How long do you store your produce? Leave it in the crisper for days and you’ve lost many of the nutrients. For example, refrigerated broccoli loses up to 35% of vitamin C content after just 24 hours. Purchase only the amount of vegetables you plan to eat in the next two to three days. Or, purchase produce that will keep, such as onions, garlic, and some bagged lettuce, such as many of the 60 varieties of Fresh Express lettuces.