Will American diners downsize, given the option?

Americans may be more accustomed to up-sizing, but at least one study has found that diners will opt for smaller portions, given the choice.

The Tulane University study, published in Health Affairs this month, wanted to compare two methods of getting people to eat less. Their premise: That the calorie counts listed on menus do little to deter overeating, but that actual smaller portions might.