Research paper
Rolls BJ, Roe LS, Kral TVE, Meengs JS, Wall DE. Increasing the portion size of a packaged snack increases energy intake in men and women. Appetite. 2004;42(1):63-69. doi:10.1016/S0195-6663(03)00117-X
Why we cite it
From the leading laboratory on portion size research, this study provides controlled experimental evidence that larger snack packages cause greater caloric intake in both men and women — and that the excess is not compensated for at dinner. Demonstrates that package size is an independent environmental cue for consumption, supporting pre-portioning and smaller package strategies in the home food environment.