aintain it． Albert Stunkard of the University of Pennsylvania found from experiments that，“80 percent of the Children of two obese parents become obese，as compared with no more than 14 percent of the offspring of two parents of normal weight．” How can obese people become normal or even thin through dieting? Well，dieting can be effective．but the health costs are tremendous．Jules Hirsch，a research physician at Rockefeller University, did a study of eight fat people．They were given a liquid formula providing 600 calories a day1.After more than 10 weeks，the subjects lost 45kg on average．But after leaving the hospital，they all regained．The results were surprising：by metabolic measurement，fat people who lost large amounts of weight seemed like they were starving．They had psychiatric problems. They dreamed of food or breaking their diet2.They were anxious and depressed；some were suicidal．They hid food in their rooms．Researchers warn that it is possible that weight reduction doesn''t result in normal weight，but in an abnormal state resembling that of starved non-obese people． Thin people，however, suffer from the opposite：They have to make a great effort to gain weight．Ethan Sims，of the University of Vermont，got prisoners to volunteer to gain weight．In four to six months，they ate as much as they could．They succeeded in increasing their weight by 20 to 25 percent. But months after the study ended，they were back to normal weight and stayed there. This did not mean that people are completely without hope in controlling their weight．It means that those who tend to be fat will have to constantly battle their genetic inheritance if they want to significantly lower their weight． The findings also provide evidence for something scientists thought was true-each person has a comfortable weight range3.The range might be as much as 9kg．Someone might weigh 60-69 kg without too much effort But going above of below the natural weight range is difficult． The body resists by feeling hungry or full and changing the metabolism to push the weight back to the range it seeks．
1What determines your weight?
2What did Jules Hirsch do in his study?
3What happened to the eight fat people after they left the hospital?
4What did Ethan Sims make his subjects do?
5 What did scientists think was true?
17、 Fruit and vegetables juices as beneficial to health as fruits and veggies1 A European study has revealed that 100 percent fruit and vegetable juices are as effective as their whole fruit/vegetable counterparts in reducing risk factors related to certain diseases. The conclusion is the result of the study designed to question traditional thinking that 100 percent juices play a less significant role in reducing risk for both cancer and cardiovascular disease than whole fruits and vegetables. Juices are comparable in their ability to reduce risk compared to2 their whole fruit/vegetable counterparts, according to several researchers in the United Kingdom who conducted the literature review. The researchers analyzed a variety of studies that looked at risk reduction attributed to3 the effects of both fiber and antioxidants. As a result, they determined that the positive impact fruits and vegetables offer come not from just the fiber but also from antioxidants which are present in both juice and the whole fruits and vegetables.4 “When considering cancer and coronary heart disease5 prevention, there is no evidence that pure fruit and vegetable juices are less beneficial than whole fruit and vegetables,” the researchers said. The researchers added that the positioning of juices as being nutritionally inferior to6 whole fruits and vegetables in relationship to chronic disease development is “unjustified” and that policies, which suggest otherwise about fruit and vegetable juices, should be re-examined. The researchers who authored the paper suggest that more studies in certain area are needed to bolster their findings. “Although this independent review of the literature is not designed to focus on any particular 100 percent juice, it does go a long way7 in demonstrating that fruit and vegetable juices do play an important role in reducing the risk of various diseases, especially cancer and cardiovascular disease,” said Sue Taylor. Her opinion is in agreement with8 the Juice Products Association,9 a non-profit organization not associated with this research. She added that appropriate amounts of juices should be included in the diet of both children and adults, following guidelines established by leading health authorities. Taylor also points to a large epidemiological study, published in the September 2006 issue of the Journal of Medicine, which found that consumption of a variety of 100 percent fruit and vegetable juices was associated with a reduced risk for Alzheimer’s disease.10 In fact, that study found that individuals who drank three or more servings of fruit and vegetable juices per week had a 76 percent lower risk of developing Alzheimer’s disease than those who drank juice less than once per week. The study was published in the International Journal of Food Sc
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