"There are many explanations." "One,is we are just much less active than we used to be.

VOA: standard.2010.07.02

Men will need more calories than women, people who are very active will need more then people who are less active, etc.

男人所需的热量多于女人,活跃的人比安静的人需要更多的热量等等

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Young people who said they were active in religious groups, sports or other interests were less likely to discuss risky behaviors.

VOA: special.2009.02.18

Women who said they were physically active even once a week showed less cognitive impairment as measured by a test.

VOA: special.2010.07.07

Young people who said they were active in religious groups,sports or had other interests were less likely to discuss risky behaviors.

VOA: special.2009.02.03

They rated themselves as less depressed and more active in school.

VOA: special.2010.07.07