There is no crisis

says Junk Food Science, who has carefully analyzed the recent report in JAMA on moderate to vigorous activity in children.

This week’s study found no correlation between changing activity levels and BMIs. Nor did it find that young people are less active today than they’ve ever been. Nor did it find poorer kids were more sedentary than richer kids. Nor did it even look at if activity levels during adolescence were related to adult levels or had any relationship to future health problems.

Sandy finds and reports some connections between the authors and various causes, but I would suggest that reporting we are healthier than ever just wouldn't make a good story for the nightly news, nor would it be a good reason for the government agencies and think tanks to promote one more regulation or law to intervene in our personal lives.