Research paper
Rolls BJ, Engell D, Birch LL. Serving portion size influences 5-year-old but not 3-year-old children's food intakes. J Am Diet Assoc. 2000 Feb;100(2):232-234. doi:10.1016/S0002-8223(00)00070-5
Why we cite it
Brief communication providing early evidence that portion size sensitivity is developmental — present in 5-year-olds but absent in 3-year-olds. This informs the project's understanding of when environmental eating cues begin to override internal satiety signals, complementing the adult portion size literature (cpi04, cpi05).