The results are clear: the more you weigh, the greater your risk of dying of cancer will be (up to 52% higher for men and 62% for women). In men as well as women, the only cancers that did not have a strong connection with weight were lung cancer and brain cancer. For women, the strongest correlation with weight was uterine cancer (子宫癌), which is 6.5 times higher for women with a BMI (Body Mass Index) of 40 or more. For men, it was liver cancer, which is 4.5 times higher in most obese(肥胖的) men.
Smokers tend to be more successful in keeping weight off than non-smokers, slightly reducing the risk. But many of them don’t have good lungs. Thus, in another way, they also face risks.
As for why extra weight leads to excess cancer death rate, there’s no clear agreement. But the decrease in vitamin D in obese people seems a likely factor. Vitamin D is known to have a role in preventing cancer. Also, there is a simple fact that obesity makes the manage-ment of cancer more difficult. Although for now there is no simple answer to why obesity increases a person’s cancer risk, all we know for certain is that the risk is real.
1. The passage is mainly concerned with the relationship between ________.
A. diet and cancer
B. body weight and cancer
C. sex and cancer
D. smoking and cancer
2. The author develops the passage mainly through ________.
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