The Cochrane Library conducted 72 controlled trials in high income countries assessing food portions.
Not surprisingly, they found more food was eaten when more was given.
But, if larger plates or bigger tableware was used, folks chose to eat more as well.
Adults, whether overweight or not, ate more.
However, children did not.
Perhaps, adults expect “supersize” portions.
Or, unconsciously felt the need to fill their plates, scientists are not sure.