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1、精选优质文档-倾情为你奉上Definitions of ObesityA) How does one define when a person is considered to be obese and not just somewhat overweight? Height-weight tables give anguideline as to whether one is simply overweight or has passed into the obese stage.B) The World Health Organization recommends using athat
2、takes into account a persons height and weight. The Body Mass Index (BMI) is calculated by dividing the persons weight in kilograms by the square of their height in meters, and is thus given in units of kg/m2. A BMI of 18.5-24.9 is considered to be the healthiest. A BMI of between 25 and 29.9 is con
3、sidered to be overweight, while a BMI of over 30 is considered to be obese.C) However, it is recognized that this definition is limited as it does not take into account such variables as age, gender and ethnic origin, the latter being important as different ethnic groups have very different fat dist
4、ributions. Another shortcoming is that it is not applicable to certain very muscular people such as athletes and bodybuilders, who can also have artificially high BMIs. Agencies such as the National Cholesterol Education Program (NCEP) in the USA and the International Diabetes Foundation (IDF) are s
5、tarting to define obesity in adults simply in terms ofcircumference.Health Effects of ObesityD) Over 2000 years ago, the Greek physician Hippocrates wrote that persons who are naturally very fat are apt to die earlier than those who are slender. This observation remains very true today. Obesity has
6、a major impact on a persons physical, social and emotional well-being. It increases the risk of developing diabetes mellitus type 2 (mature onset diabetes) and also makes Type 2 diabetes more difficult to control. Thus weight loss improves the levels of blood glucose and blood fats, and reduces bloo
7、d pressure. The association between obesity and coronary heart disease is also well-known.CancerE) Furthermore, in 2001 medical researchers established a link between being overweight and certain forms of cancer, and estimated that nearly 10,000 Britons per year develop cancer as a result of being o
8、verweight. This figure was made up of 5,893 women and 3,220 men, with the strongest associations being with breast and colon cancers. However, it is thought that being overweight may also increase the risk of cancer in the reproductive organs for women and in the prostate gland for men.F) The link b
9、etween breast cancer and nutritional status is thought to be due to thehormones oestrogen and progesterone, which are produced by the ovaries, and govern a womans menstrual cycle. Researchers have found that the more a woman eats, or the more sedentary her lifestyle, the higher are the concentration
10、s of progesterone. This link could explain why women from less affluent countries have lower rates of breast cancer. Women from less affluent nations tend to eat less food and to lead lifestyles which involve more daily movement. This lowers their progesterone level, resulting in lowerto breast canc
11、er.G) The Times newspaper, in 2002 reported that obesity was the main avoidable cause of cancer among non-smokers in the Western world!AgingH) Research published by St Thomas Hospital, London, UK in 2005 showed a correlation between body fat and aging, to the extent that being obese added 8.8 years
12、to a womans biological age. The effect was exacerbated by smoking, and a non-overweight woman who smokes 20 cigarettes a day for 20 years added 7.4 years to their biological age. The combination of being obese and a smoker added at least ten years to a womans biological age, and although the study o
13、nly involved women, the lead researcher Professor Tim Spector believes the finding would also apply to men.I) The aging effect was determined by measuring the length of telomeres, tiny caps on the ends of chromosomes, which help protect the DNA from the ageing process. Indeed, telomeres have been du
14、bbed the chromosomal clock because, as an organism ages, they become progressively shorter, and can be used to determine the age of the organism. Beyond a certain point, the telomere becomes so short that it is no longer able to prevent the DNA of the chromosome from falling apart. It is believed th
15、at excess body fat, and the chemicals present in tobacco smoke release free radicals which trigger inflammation. Inflammation causes the production of white blood cells which increases the rate of erosion of telomeres.DementiaJ) Recent research (2005) conducted in the USA shows that obesity in middl
16、e age is linked to an increased risk of, with obese people in their 40s being 74% more likely to develop dementia compared to those of normal weight. For those who are merely overweight, the lifetime risk of dementia risk was 35% higher.K) Scientists from the Aging Research Centre at the Karolinska
17、Institute in Sweden have been able to take information such as age, number of years in education, gender, body mass index, blood pressure level, physical activity and genetic factors, assigning each a risk score. They then used this information to devise a predictive test for dementia. This test wil
18、l enable people at risk, for the first time, to be able to affect lifestyle changes which will reduce their risk of contracting dementia.Other ProblemsL) The world-wide upsurge in obesity, particularly in children, is of major economic concern, liable to drain economies. Of further concern is that r
19、esearch conducted in Australia and published in 2006, shows that up to one third of breech pregnancies were undetected by the traditional palpation examination, the danger being greatest for those women who are overweight or obesea growing proportion of mothers. This means that such women are not ge
20、tting the treatment required to turn the baby around in time for the birth, and in many cases require an emergency Caesarean section.M) This is a true health-care crisis, far bigger than Severe Acute Respiratory Syndrome (SARS) and ultimately, even bigger than AIDS.对应题目：1. You can judge whether one
21、is simply overweight or has passed into the obese stage according to the height-weight table.2. Using the Body Mass Indexto define a persons weight ideal is limited, because it does not takes into account many variables such as age, gender and ethnic origin.3. A persons emotional well-being would be
22、 affected by obesity.4. Obesity has something to do with cancer in the prostate gland for man.5. Women from less affluent nations tend to have much less breast cancer.6. A non-overweight woman who smokes 20 cigarettes a day for 20 years added 7.4 years to her biological age.7. The excess body fat, l
23、ike the chemicals present in tobacco smoke, can lead to inflammation.8. Obese people in middle age run an increased risk of dementia .9. The predictive test for dementia will help people to affect lifestyle changes that will reduce their risk of contracting dementia.10. The world-wide upsurge in obesity, particularly in children, will possibly drain economies.参考答案：1. A 2. C 3. D 4. E 5. F 6. H 7. I 8. J 9. K10. L专心-专注-专业