北師大版高中英語(yǔ)模塊7--Unit 21 Lesson1-2

[00:01.40]Some people use gum to lose weight. [00:03.55]They say it controls their appetite. [00:05.77]Further research has been carried out, [00:07.56]which shows that, [00:08.80]if you had chewed sugar-free gum [00:10.54]regularly for the last year, [00:12.34]it is possible that you would have lost up to [00:14.20]5 kilos by now. [00:16.30]They found if people chewed 100 times [00:18.63]per minute for 12 minutes, [00:20.70]70 kilocalories were burned. [00:23.29]Gum can also contain medicine. [00:25.71]Today, there are gum products [00:27.45]that help smokers give up their bad habit. [00:30.44]One former smoker has appeared [00:31.87]in an advertisement saying, [00:33.58]"If I had used this chewing gum [00:35.02]when I was giving up smoking ten years ago, [00:37.68]I would have been more successful [00:39.61]at quitting quickly and much healthier today." [00:43.26]However, we must not forget the negative [00:45.59]side of chewing gum. [00:47.25]Diet specialists say we should avoid it. [00:50.29]Why? They state that chewing starts [00:52.78]the production of stomach acid [00:54.33]and digestive juices.If we chew gum, [00:57.28]it will cause our bodies to believe [00:59.16]we are digesting food [01:00.82]and our stomachs will produce digestive juices [01:03.65]unnecessarily.This will make digestion more [01:06.18]difficult and may cause feelings of sickness [01:09.09]or even headaches. [01:09.95]

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