Pineapple is a kind of fruit that is rich in vitamins, enzymes and antioxidants( 酶和抗氧化剂 ). The nutritional content of canned pineapple is different from that of raw pineapple. According to United States Department of Agriculture (USDA), canned pineapple is typically higher in calories and sugar. It also contains fewer vitamins and minerals. If you choose canned pineapple, try to get it with no added sugar or look for a variety that is canned in fruit juice instead of sweet liquid. Pineapple contains a great amount of vitamin C, a water-soluble antioxidant that fights cell damage. This makes vitamin C a helpful fighter against problems such as heart disease. Pineapple may help you keep standing tall and strong. One cup of raw pineapple pieces contains 2.6 mg of manganese, a mineral that ’ s important to developing strong bones. A 1994 study suggested that manganese, along with other small amounts of minerals, may be helpful in preventing bones becoming weak and breaking easily in aged women. Pineapple can help reduce the risk of macular degeneration, a disease that affects the eyes as people age, due in part to its high amount of vitamin C and the antioxidants it contains. Like many other fruits and vegetables, pineapple contains dietary fiber, which is important and necessary for keeping you regular and in keeping your intestines( 肠 ) healthy. “ Because pineapple is a great meat tenderizer, eating too many can lead to the pain of the mouth, including the lips and tongue, ” said San Diego-based nutritionist Flores. “ But, it should disappear within a few hours. ” But if the feeling continues, or if you experience breathing difficulties, you should seek medical help immediately, as you could have a pineapple allergy. Flores pointed out a possible negative to pineapple ’ s high levels of vitamin C. “ Because of the high amount of vitamin C that pineapple contains, eating large quantities may cause some serious problems, ” she said. Eating undeveloped pineapple or drinking undeveloped pineapple juice is dangerous. Undeveloped pineapple is poisonous to humans and can lead to severe diarrhea( 腹泻 ) and vomiting.