B

　　Why are people interested in eating raw foods or whole foods? One reason is that eating these types of food reduces the risk of acid accumulation in your body.

　　Raw and whole foods are usually digested more efficiently than cooked and refined foods. When we cook foods, we destroy the natural enzymes (酶) that are part of the food in its raw form. These enzymes were intended by nature to help us digest the food. When we consume food without these natural enzymes, our bodies either digest the food improperly or allow too many nutrients to be absorbed into the bloodstream.

　　In both instances, the result is obesity. When too many nutrients are absorbed at once, the body grows fat. Improperly digested food moves slowly through the digestive tract, where it becomes increasingly acidic. To protect its vital organs from this acidic waste, the body changes the acid into fat and stores it safely away from the organs.

　　Processed foods contain chemical elements, which might confuse the appetite mechanism that tells us when we've had enough to eat; as a result, people often overeat. Processed foods also upset the digestive cycle. The body will either identify these foods as allergens and then store them safely away from the organs as fat, or the remains of undigested food will become acidic and enter the bloodstream as acid waste, which will stick to the blood vessel walls and block the passage of vital oxygen and nutrients heading for the body's cells. The body's metabolism (新陈代谢) becomes inactive, and the result is weight gain and obesity.

【2014届高三英语一轮单元复习训练：Module 1　Our Body and Healthy Habits（外研版必修2）】相关文章：

★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (1)

★ 2014届高考英语一轮复习课时作业(四十八)选修8Module 6《The Tang Poems》（外研版）

★ 【人教版】2014届高考英语一轮复习指导考点针对练：必修2 unit5《Music》

★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (59)

★ 北京市2014高考英语一轮复习 练习手册（19）必修4 Unit 4 Body language（含解析）新人教版

★ 2014届高考英语一轮复习课时作业(七)必修2Module 1《Our Body and Healthy Habits》（外研版）

★ （安徽专用）2014届高考英语一轮复习方案 作业手册（8）模块3 《Unit 8 Adventure》（含解析） 北师大版必修1

★ 四川省2016届高考英语一轮复习课时作业（34） Module 4 Music 外研版选修6

★ 2017届高考英语二轮复习课时训练：14（含解析）

★ 【人教版】2014届高考英语一轮复习指导考点针对练：选修7 unit2《Robots》