“Increasing the portion size of all foods resulted in a significant increase in energy intake that was sustained over 2 days. These data support suggestions that large portions are associated with excess energy intake that could contribute to increased body weight.”
This classic study demonstrated that increasing the size of food portions led to increased food consumption.
[1]. Rolls, B. J., Roe, L. S., & Meengs, J. E. (1986). Effects of serving size on food consumption. American Journal of Clinical Nutrition, 44(5), 687-691.
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Liquid Protein can help manage portion control.