How many M&MS are enough? It depends on how big the candy scoop
is. At least that’s a key factor, says a study that offers new evidence
that people take cues from their surroundings in deciding how much to
eat.

It explains why, for example, people who used to be satisfied by a
12-ounce can of soda may now feel that a 20-ounce bottle is just right.

Read (AP via USA Today)