儿童更多注重饮食营养

　　在所有的调味品里面，“诽闻”最多的莫过于味精了。有人视若天赐，无它不餐;有人拒之千里，决不沾唇。反对者对味精大有意见，所谓味精是化学合成的，吃多了，轻则掉头发，重则导致记忆力衰退。另一种论点则支持味精，认为进食味精对人体无害，而谷氨酸盐是氨基酸的一种，是人体所必需的。 　　那么，让我们先来认识一下味精。味精是鲜味调味品类烹饪原料，是以小麦、大豆等含蛋白质较多的原料经水解或以淀粉为原料，经发酵法加工而成的一种粉末状或结晶状的调味品。其主要成分为谷氨酸钠，还含少量食盐、水分、脂肪、糖、铁、磷等物质。食用味精的鲜味能刺激味觉细胞和兴奋消化腺体，增加食欲，促进消化。 　　味精还有一定的药用价值，它能改变人体的营养状态，使脑内乙酰胆碱增加，从而可以治疗神经衰弱;谷氨酸对改进和维持丘脑的机能是十分重要，有减少血液中氨含量的用处，可作为精神病人的中枢及大脑皮层的补剂，还可改善神经有缺陷的儿童的智力。 　　虽然味精可调节口感并有一定的饮食营养，但吃多了会使血液中的锌变为氨酸锌，从尿液中排出，造成急性缺锌症状。锌是人体必需的微量元素，小朋友若缺乏锌，会引起生长发育不良、智力减退、性晚熟。同时，亦会造成味觉紊乱，食欲不振，长期下去会导致营养不良。 　　另外，味精吃多了还常常会感到口渴，这是因为味精中含有钠，过多摄入可导致高血压。所以老年人和患有高血压、肾病、水肿等疾病的人尤其应少吃味精。经实验，每道菜应以不超过0.5毫克味精为宜。如过食则可造成体内水钠潴留，导致血管管腔变细，血管阻力升高，并且血容量升高，加重心、肾承担，进一步使血压升高。 　　除此之外，要注意婴幼儿尽量不要食用味精，因为幼儿各器官发育不完全。尤其是一岁以下的婴儿应禁食味精，母亲用母乳喂养孩子时，应少吃或不吃味精。再有就是不要对味精高温加工，因为味精在高温时会分解成有害物质。在烹饪时，最好在出锅之前再加入味精。 In all the spices, "scandal" most not too monosodium glutamate. Some people regard if heaven, no it http://hitjob.net/post/674.html does not eat; some people away, never touch. Opponents of the MSG has the opinion, the so-called MSG is a chemical synthesis, eat more,light hair, heavy then lead to the decline of memory. Another argument is that thesupport of monosodium glutamate, eating MSG is harmless to the human body, andglutamate is an amino acid, is necessary to the human body. So, let us look first to understand the monosodium glutamate. MSG is a delicioussauce cooking www.lianhejob.com materials, with wheat, soybean protein rich raw materials byhydrolysis or using starch as raw materials, a powdered or crystalline afterfermentation processing of seasoning. The main component of MSG, alsocontaining a small amount of salt, water, fat, sugar, iron, phosphorus and othersubstances. Eat MSG umami can stimulate the taste cells and excited digestiveglands, increase appetite, promote digestion. MSG also has some www.yofotoark.com medicinal value, it can change the nutritional state of the human body, increase the brain acetylcholine, which can treat neurasthenia;glutamate is very important to improve and maintain the thalamic function, reducethe blood ammonia level in use, can be used as a supplement to the central andthe cerebral cortex of the human spirit disease, can also be to improve the neurological defects in children's intelligence. Although the monosodium glutamate can adjust the taste and nutrition some, buteating too much can make blood www.zjiajias.com zinc into ammonia acid zinc, discharged from the urine, cause acute symptoms of zinc deficiency. Zinc is an essential trace element,if children zinc deficiency, can cause a bad, mental decline, late maturing growth. At the same time, also can cause taste disorders, loss of appetite, go down for a long time will lead to malnutrition. In addition, eat a lot of MSG also often feel thirsty, it is because MSG contains sodium, excessive intake can lead to high blood pressure. So the elderly and people with high blood pressure, kidney www.jixieinfo.net disease, edema and other diseases of people in particular should eat msg. Proved by the experiment, each dish shouldnot exceed 0.5 mg MSG is appropriate. If food can cause the body sodium and water retention, leading to thinning of blood vessel lumen, vascular resistance increased, and elevated blood volume, and center of gravity, kidney burden,further elevated blood pressure. In addition, attention should be paid to the infant should not eat MSG, becausechildren are not fully developed organs. Especially infants under one year of ageshould be fasting www.zhuzhucun.com monosodium glutamate, breast-feeding mother, should eat less or do not eat msg. There is not the monosodium glutamate monosodium glutamate in the high-temperature processing, because the high temperature will break intoharmful substances. In cooking, the best add MSG in the pan before.