A study displayed a bowl of M&M’s containing a spoon, inviting individuals to scoop as many as they wanted.
Participants ate more candy when served with a large spoon than when served with a small spoon.
A quantity corresponding to one unit appears as the optimum quantity.
See the full study here :
Geier, A. B., Rozin, P., & Doros, G. (2006). Unit bias: A new heuristic that helps explain the effect of portion size on food intake. Psychological Science, 17(6), 521-525
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