Empty Calories

Junk foods such as sugary sodas and chips make up nearly one-third of calories in the U.S. diet, researchers said on Tuesday.

"Healthy foods such as vegetables and fruit make up only 10 percent of the caloric intake in the U.S. diet. A large proportion of Americans are undernourished in terms of vitamins and minerals," said Gladys Block, a professor of epidemiology and public health nutrition at the University of California.

"We shouldn't be telling people to eat less -- we should be telling people to eat differently."