An interesting and telling example is the conclusion that Professor Wansink to make ice cream: “If 100 g of ice are placed in small glass, then a glutton would seem that there are many ice cream. If the same amount be placed in a large cup, ice cream will be “small” and would require additional man”.
The book is based on research conducted by a team of 63 experts and concludes it is the main reason for overeating is actually a purely psychological and not directly related to hunger or taste of food.
Original Source: http://tips4health.net/2011/08/why-people-are-overeating/