葡萄糖不耐症的最新研究；
乳糖不耐症的病因是缺乏乳糖酶，这些乳糖酶是消化乳糖的必需物质，牛奶中的糖就属于此类。
Lactose intolerance stems from a deficiency of the enzyme lactase, which is needed to help digest lactose, a sugar in milk.
举例来说，不耐乳症不是由免疫系统的过分热情引起的，而是缺乏一种酶的结果，而身体需要这种酶来分解牛奶中主要的糖——乳糖。
Rather than being caused by an overenthusiastic immune system, milk intolerance, for example, results from a lack of the enzyme the body needs to break down lactose, the main sugar in milk.
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