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C. Less Fat May Not Be Better

Narrator: This is Science Today. The American Heart Association recommends that 30 percent or less of our calories should come from fat. But Ronald Krauss, a scientist at the Lawrence Berkeley National Laboratory says there's a trend in society to further reduce fat intake.

Krauss: The concern has been, should we therefore be advising these more restricted diets for the population as a whole, since heart disease is still the leading cause of death in this country.

Narrator: But Krauss found evidence that very low fat diets may be good for some and bad for others, based in part on genetics.

Krauss: We're not trying to, in any way, undermine our population goals, in fact as chairman of the American Heart Association Nutrition Committee, it's one of my missions, actually to help improve the overall American diet by reducing the amount of saturated fat, cholesterol, calories in particular in the diet and encourage physical activity. It's really the notion that if eating a little fat is good, then eating no fat is the best. That doesn't necessarily hold true.

Narrator: For Science Today, I'm Larissa Branin.