Simple Science

Several months ago I noticed a favorite all-you-can-eat-pizza-emporium I frequent had stopped giving out food trays to their patrons; i.e. a person walking through the line, holding a plate in one hand and a beverage glass in the other, is much more limited in how much food they can pile up to take to their seat (they can get out of their seat and return to the line for 2nds, 3rds, etc., but it's still no doubt an effective limiting measure).
Now the NY Times reports that this is actually a trend across college campus cafeterias to do away with trays with many benefits resulting. Simple steps can sometimes have many effects; less tray-washing/water-use, less food waste, less overeating, less cost (...just not a good time to buy stock in tray-making companies!):

http://www.nytimes.com/2009/04/29/nyregion/29tray.html?_r=1&partner=rss&emc=rss