Check out their reactions at: Restaurants Experimenting with Smaller Portions.
Here's a sample:
"People can be addicted to food the same way some are addicted to alcohol. Unfortunately there is the one difference - we still have to eat. It isn't like we can just stop, like someone who smokes.
I think it is a wonderful idea to have smaller portions as an option. It is difficult to stop eating when there is still food on your plate."