An interesting story from ABC about serving-size dividers in Pringles tins. Basically, every serving is marked off by a chip of a weird color. This helps people hold themselves to a serving.
“The colored chip did all the work,” says Paul Rozin, a professor of psychology at the University of Pennsylvania and one of the authors of the study. “This study showed that segmenting foods gets people to eat less. People tend to eat what you put in front of them. If you put less in front of them and give them a signal, they will take it.”
Makes sense to me, although most snack foods aren’t so neatly stacked as to work this way. An even better idea is eating some nice crunchy carrots.