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1、Obesity Epidemic,Those who slept an average of 5 hours a night gained weight during the study period than women who slept 6 hours, who in turn gained more than those who slept 7.,1Not enough sleep,Result: sleep loss may precipitate weight gain,2Climate control,1.13 to 18(between 1970 and 2000) Briti
2、sh 2.23% to 47%( between 1978 and 1997) in the US 3In the southern states 37% to 70% in 1978,Result :studies show that in comfortable temperatures we use less energy,3Less smoking,People who had quit in the previous decade were much more likely to be overweight than smokers and people who had never
3、smoked .Among men, for example, nearly half of quitters were overweight compared with 37% of nonsmokers and only 28% of smokers.,Result :smokers really do tend to be thinner than the rest of us .,4Genetic effects,Your chances of becoming fat may be set ,at least in part ,before you were even born .,
4、experiment:offspring of mice fed a high-fat diet during pregancy are much more likely to become fat than the offspring of identical mice fed a normal diet. Intriguingly,the effect persists for two or three generations.,Adults aged 40 to 79 were around three times as likely to be obese as younger peo
5、ple. Non-white females also tend to fall at the fatter end of the spectrum: Mexican-American women are 30% more likely than white women to be obese, and black women have twice the risk. Result :Older may also be one of the factors that lead to obesity,5A little older,6Mature mums,The mean age for ha
6、ving a first child,The number of born children,Result :this combination of older mothers and more single children could be contributing to the obesity epidemic.,On its own,like marring like cannot account for any increase in obesity, but combined with others-particularly the fact that obesity is partly genetic, and that heavier people have more children-it amplifies the increases from other causes.,7Like marring like,thank you,