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乳糖是奶类中特有的糖类(鲜奶中含乳糖5克/100毫升,奶粉中含乳糖40~60%),是婴幼儿膳食能量的主要来源。人食入的乳糖需经体内乳糖酶水解为葡萄糖和半乳糖后才能被吸收。当体内乳糖酶缺乏时,乳糖从小肠直接转运到大肠,在肠道菌的作用下,乳糖被发酵,引起水和气体的累积,刺激肠道粘膜,导致腹涨、腹鸣、肠痉挛,甚至腹泻,当饮用奶制品后,有上述症状时一般称为乳糖不耐受或乳糖吸收不良,俗称“饮奶过敏症”。儿童乳糖不耐受发生的原因,可分为以下几个类型:1、先天性乳糖酶缺乏,指从婴儿出生即无乳糖酶的,无论饮用母乳、牛乳均可导致明显腹泻,停止喂乳或代以米汤类食物腹泻消失,即为先天性乳糖酶的缺乏或低下,可能与遗传有关。
Lactose is a unique carbohydrate in milk (milk contains lactose 5 g / 100 ml, milk contains lactose 40 ~ 60%), is the main source of dietary energy for infants and young children. Human ingested lactose to be lactose lactase after hydrolysis to glucose and galactose before being absorbed. When lactase is deficient in the body, lactose is transported directly from the small intestine to the large intestine. Under the action of intestinal bacteria, lactose is fermented, causing the accumulation of water and gas, stimulating intestinal mucosa, causing abdominal up, abdominal vomit, intestinal spasm, and even Diarrhea, when drinking dairy products, the above symptoms are generally referred to as lactose intolerance or lactose malabsorption, commonly known as “drinking milk allergy.” Causes of lactose intolerance in children can be divided into the following types: 1, congenital lactase deficiency, that is born from the baby that is lactase-free, regardless of drinking milk, milk can cause significant diarrhea, stop feeding or Diarrhea on behalf of the rice soup disappeared, which is the lack of congenital lactase or low, may be related to the genetic.