It's not just happening with fries and soft drinks at fast-food restaurants. University of North Carolina researchers say portions of home-cooked meals are getting larger.
For example, in 1977 homemade burgers were 5.7 ounces. In 1996 they fattened up to 8.4 ounces.
In 1977, snack foods produced 11.3 percent of the average American's energy intake. By 1996, that figure had climbed to 17.7 percent.
The research involved analyzing data from a nationwide survey consisting of more than 63-thousand people ages two and older.