Katie Couric's Notebook: Military Obesity

A new Pentagon report concludes that more than a third of Americans between 17 and 24 are unfit for military duty because of physical or medical problems - and the main reason is obesity. The percentage of young adults considered obese is now four times what it was just a generation ago.

Add to that men and women ineligible because of a limited education, criminal records, or illegal drug use - and the report concludes almost three-quarters of potential recruits are unable to enlist. Military leaders call that a threat to national security.

The obstacle facing the Pentagon is a symptom of a much larger disease.

This war may not be in Afghanistan or Iraq but the battle of the bulge in this country is just as dangerous and costly. Fitness to serve is one thing, but in or out of uniform, Americans need to focus on fitness to live long and health lives.

That's a page from my notebook.

I'm Katie Couric, CBS News.