苹果含丰富糖类，主要含蔗糖、还原糖，以及蛋白质、脂肪、多种维他命及钙、磷、铁、钾等矿物质；尚含苹果酸、奎宁酸、柠檬酸、酒石酸、单宁酸、黏液质、果胶、胡萝卜素，果皮含叁十蜡烷。苹果内含钾盐，可使体内钠盐及过多盐分排出，有助降低血压。苹果所含的有机酸类成分，能刺激肠蠕动，并和纤维素共同作用可通大便，保持大小便畅通。苹果含果胶物质，可以调整人体生理机能；而其所含单宁酸可同时缓治轻度腹泻和便秘。单宁酸及有机酸均有收歛作用，并能吸收细菌及毒素。苹果还可降低血中胆固醇。
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