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．

　　The accumulation of acid in the digestive tract makes digestion increasingly inefficient．When that happens, even healthy foods can become acidic and the food allergies will become more common．

　　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．

　　72．It can be inferred from Para．2 that _______．

　　A．foods with natural enzymes help people keep fit

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