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apple fruit green pile ripe organic healthy food nature fresh crisp juicy sweet tart refreshing delicious nutritious antioxidant fiber vitamin C potassium calcium magnesium phosphorus iron zinc copper manganese selenium fluoride pectin polyphenols flavonoids anthocyanins carotenoids chlorophyll lutein zeaxanthin beta-carotene lycopene astaxanthin resveratrol quercetin catechin epicatechin procyanidin