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肪是人体不可缺少的组成成分，常以各种磷脂和糖脂等形式存在于细胞膜以及脑和外周神经组织中。脂肪可促进脂溶性的维生素A、维生素D、维生素E、维生素V和胡萝卜素的吸收。此外，中性脂肪贮存于机体内，为生命活动提供重要能源。可见，一定量的脂肪对人体健康是十分有益的，如果体内脂肪含量超过标准，就会产生弊端。仙人掌脂肪含量较少，每100克鲜仙人掌仅含脂肪210毫克，因而属于低脂肪类。
糖类包括单糖、双糖和多糖等许多种类，它们是碳水化合物中最重要的一部分，也是构成机体的重要物质。其中，蛋白参与细胞膜的组成成分，蛋白参与结缔组织的组成．糖脂参与组成神经组织等等。此外，糖类还以肌糖元和肝糖元的形式贮存于机体内，为生命活动提供了最重要的能源。所以，糖类对人体健康有十分重要的作用。每 100克鲜仙人掌含总糖7100毫克，属于低糖食品。在当前人们生活水平普遍提高，糖摄人量不断增加，并由此给人类健康带来潜在危害，以及很多人体重超标、面临减肥的情况下，低糖、低热量的绿色保健食品对提高人类健康水平无疑将产生积极作用。
维生素是人体不可缺少的有机营养物质，它虽然不是构成机体组织的基本成分，也不为机体活动提供热能，但却对人体进化过程和生理活动的调节起重要作用。维生素在人体内含量虽低，却是生长发育和新陈代谢不可缺少的物质。人体如果缺少了某种维生素，就会得相应的疾病。维生素大多不能在体内合成，或合成量极少而必须从食物中摄取。仙人掌每100克含维生素 A 0.22毫克，超过了番茄 40％。维生素c量为15.9-20.9毫克，超过了梨和桃。此外，还含有维生素BI和维生素BZ。食用200克仙人掌，就能满足正常人一天需要量的50％。
微量元素在人体内的含量虽然不多，但它们常与酶、激素、维生素及核酸等活性物质结合在一起，参与机体的重要代谢过程，与人体健康息息相关，因而越来越引起人们的重视。
仙人掌每100克含钙310毫克；镁110毫克，铁4毫克，比粮食、蔬菜、水果和鱼、肉、蛋都高，铜、锌含量和鱼、肉、蛋及其他水果、蔬菜接近。
参考答案:Body fat is an essential component, often exist in various forms, such as glycolipids and phospholipids in the brain and peripheral nerve cells and tissues. Fat may promote fat-soluble vitamin A, vitamin D, vitamin E, vitamin V and the absorption of carotenoids. In addition, a neutral body fat stored in the machine, providing an important energy source for life. This shows that a certain amount of fat is very beneficial to human health, body fat content than if standard, it will lead to many problems. Cactus less fat per 100 grams of fat, 210 milligrams of fresh cactus mixtures are therefore low in fat category.
Carbohydrates include monosaccharide, disaccharide and polysaccharide and many other types of carbohydrates they are the most important part. also constitute an important body of material. Among them, the composition of membrane proteins, the protein in connective tissue component. Glycolipid participate in the formation of nerve tissue, etc.. In addition, also in muscle glycogen and carbohydrates in the form of glycogen storage in vivo, the most important activities of life energy. Therefore, the role of carbohydrates is very important to human health. Total sugar per 100 grams of fresh cactus containing 7100 mg sugar foods fall. In the current general improvement of people's living, the continuous increase in sugar intake, and thus potentially harmful to human health. weight and a lot of people exceeding the situation facing slimming, low-sugar, Green low calorie health food raise the level of human health will undoubtedly have a positive effect.
Human vitamin is essential organic substances, while it does not constitute the basic body composition, not to provide body heat, but on human evolution and physical activities play an important role in regulating. Although low vitamin content in the human body, it is indispensable to the growth and metabolism of the material. If a lack of certain vitamins body would corresponding diseases. Most of the body of vitamin synthesis, synthesis or from food intake to be minimal. Vitamin A cactus containing 0.22 milligrams per 100 grams, more than 40% of the tomato. Vitamin C content of 15.9-20.9 mg over a pear and peach. In addition, it contains vitamins and vitamin BI BZ. 200 grams of edible cactus, we will be able to meet 50% of normal day requirements.
The content of trace elements in the human body is very small, but they are often associated with enzymes, hormones, combination of active substances such as vitamins and nucleic acids, an important metabolic process in the body, and is closely related to human health. thus drawn increasing attention.
310 mg of calcium per 100 grams of cactus; Magnesium 110 mg, 4 mg iron than grains, vegetables, fruits and fish, meat, eggs, copper, zinc and fish, meat, eggs and other fruits, vegetables close.