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．

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(過敏原)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(新陳代謝)becomes inactive，and the result is weight gain and obesity．

To stop this vicious circle in its tracks，people need to consume food and supplements that will neutralize the acid already accumulated in body．Eating the right types of raw and whole foods can help．It’s also important to restore your enzyme balance．You need to identify and avoid the foods that cause acid accumulation and consume the foods that increase enzyme production．If you truly want to change and help your body heal itself，you need to take an active approach．

1.It can be inferred from Para．2 that________．

A．foods with natural enzymes help people keep fit

B．we’d better be cautious about raw and whole foods

C．it is essential for people to protect their vital organs

D．giving up cooked and refined foods is a new lifestyle

2.Processed foods are unhealthy because they________．

A．destroy body's cells

B．may lead to obesity

C．a(chǎn)re difficult to digest

D．stop body's metabolism

3.What is the main purpose of this passage？

A．To warn people of the problem of obesity．

B．To advocate eating more raw and whole foods．

C．To inform people of the harm of processed foods．

D．To tell the differences between raw and processed foods．

4.The underlined word “vicious” in the last paragraph probably means________．

A．violent B．progressive C．harmful D．positive

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