Narrator: This is Science Today. The Centers
for Disease Control and Prevention recently reported
obesity is fast becoming a national epidemic. While
the report did not delve into the reason, it suggests
the most likely cause is lack of exercise. Ronald
Krauss, a senior scientist at the Lawrence Berkeley
National Laboratory and member of the American Heart
Association's Nutrition Committee, says while there's
not a total consensus on the what the best exercise
regimen should be, it's clear the nation is not doing
Krauss: If we want to eat as much as we're
eating, we're going to have to exercise more. If we
don't exercise more, we're going to have to eat less.
There's no two ways about it. That's the only way
to deal with the obesity epidemic that we're now facing.
Narrator: Krauss stresses some exercise is
better than none at all.
Krauss: While we want to encourage at least
minimal physical activity in the population as a whole
and certainly to balance what we're consuming in terms
of calories, we also think that people should recognize
that they could do more. The more physical exercise
you can build into your life, the more steps you can
take - literally - to get out of your chair and move,
the healthier you're gonna be.
Narrator: For Science Today, I'm Larissa Branin.