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...advises people to take the new data with, well, a grain of salt. The information was collected by asking participants to self-report their exercise habits, which is a notoriously unreliable method - people are not very good at gauging their activity accurately. Add to that the fact that questionnaires are not refined enough to pick up small changes in people's energy intake and expenditure, and it's obvious why the findings are informative but not game-changing. "These data are useful in highlighting who should be targeted - the most difficult cases," says Rankin. In the new study, that group...
That's precisely why the findings of a new study by researchers at the Johns Hopkins Bloomberg School of Public Health came as such a surprise. The report, published last week in the journal Obesity Reviews, finds that the amount of physical activity among U.S. teens has not in fact changed significantly over the past two decades, even while that population has gotten heavier. "On the one hand, we have seen the obesity-prevalence increase, but we don't see a decrease in physical activity," says Dr. Youfa Wang, an associate professor at the Center for Human Nutrition at Hopkins...
...survey also found that teens' overall rate of daily exercise had not changed much since 1991, when the study sample was first asked to report their participation in gym classes in school and their level of physical activity at home. The percentage of teens attending daily gym class has stayed relatively steady since 1991; on average, the yearly change in the proportion of students participating was less than 1%. The percentage of ninth- through 12th-graders getting adequate levels of moderate physical activity - exercise such as slow bicycling, fast walking or pushing a lawn mower, which did not make participants...
...special report on the science of appetite...
...Katz is editor of The Oriental Economist Report and author of Japanese Phoenix...