Both the reading and the lecture talks about lactose intolerance. The reading states that when people do not eat dairy, their bodies stop making enzymes and this is the reason why lactose intolerance occurs. On the other hand, the lecture disagrees with the reading.

 

First, according to the reading, lactose intolerance occurs in culture which do not eat many dairy products. For example, in ancient China, people didn't drink milk, and now, Chinese started consuming, but 90% of Chinese are suffering from lactose intolerance. However, according to the lecture, lactose intolerance often occurs in country which eat many dairy products. For instance, in India, though people drank milk since 6 century B.C, 50% of Indian are suffering from lactose intolerance.

 

Second, according to the reading, lactose intolerance occurs in people who do not regulary consume dairy over time. The reading provides an example of Japan, which many people do not eat dairy after their infancy, lose 80% of ability to digest dairy product. In contrast, according to the lecture, lactose intolerance occurs in many cultures which do not eat dairy. For example, in Mexico, people lose 80% of ability to digest dairy when they are 2 years old, and lose 50% of ability by age 10. Thus, the reading states that development of lactose intolerance does not influenced by regularity.

 

 

To conclude, the reading says that when people do not eat dairy, lactose intolerance occurs and that's why lactose intolerance occurs in culture which don't eat dairy products. According to the reading, in China, which do not eat dairy in ancient, 90% of people is lactose intolerance. Also, it occurs when people do not eat dairy regularly, like Japan, 80% of people who do not eat dairy after their infancy lose their ability to digest dairy products. Conversly, the lecture says that lactose intolerance is genetically inherited, because lactose intolerance occurs in cultures like India which drank milk since 6 century B.C. Additionally, it also occurs in cultures which do not eat dairy, For example, Mexican lose 80% of their ability to digest dairy by age 2, and 50% of ability by age 10. So, the lecture states that development of lactose intolerance do not affected by regularity.