Plate sizes have increased from 9 inches in the 1960s to 11-12 inches today—a 12-inch plate has 44% more surface area. Research by Geier, Rozin, and Doros on “unit bias” shows people serve themselves 25-30% more on larger plates without awareness, then eat it all because a full plate feels like a complete meal. You’re not choosing portions—your plates are. Smaller plates are one of the simplest environmental interventions.
This companion covers the expanding plate, unit bias, visual illusions, the audit, and the intervention. (4 min read)