Scientific American has an interesting article on food labeling as it affects people’s choices. It seems that while calorie counts are somewhat useful, providing information on how much activity will be needed to work off an item is much more effective.
Label #3 was most effective
Perhaps the most obvious flaw with this initial study is that it involved virtual meal selection. In short, the participants claimed they would order healthier meals, but there was no real food involved. A real-world test is needed to corroborate these findings.