They Secretly Refilled Their Soup. Nobody Noticed

In 2005, researchers at the University of Illinois served tomato soup to fifty-four people. Some of the bowls were secretly refilled through hidden tubes. Those people ate far more, and still felt no fuller. This video looks at why we eat what's in front of us: how portion size, plates, packages and childhood rules quietly decide when we stop. Sources: • Wansink, B., Painter, J. E., & North, J. (2005). "Bottomless Bowls: Why Visual Cues of Portion Size May Influence Intake." Obesity Research, 13(1), 93–100. • Rolls, B. J., Morris, E. L., & Roe, L. S. (2002). "Portion size of food affects energy intake in normal-weight and overweight men and women." American Journal of Clinical Nutrition, 76(6), 1207–1213. • Rolls, B. J. et al. "Increasing the portion size of a packaged snack increases energy intake in men and women." • Young, L. R., & Nestle, M. (2002). "The contribution of expanding portion sizes to the US obesity epidemic." American Journal of Public Health. A note on Brian Wansink: in 2018, Cornell University found he had committed academic misconduct, and many of his papers were corrected or retracted. The portion-size effect itself has also been shown by independent labs. This video is for general education and is not medical advice.