Benton, D. (2015). Portion size: What we know and what we need to know. Critical Reviews in Food Science and Nutrition, 55(7), 988–1004. https://doi.org/10.1080/10408398.2012.679980
Ledikwe, J. H., Ello-Martin, J. A., & Rolls, B. J. (2005). Portion sizes and the obesity epidemic. The Journal of Nutrition, 135(4), 905–909. https://doi.org/10.1093/jn/135.4.905
Ministry of Health. 2020. Eating and Activity Guidelines for New Zealand Adults: Updated 2020. Wellington: Ministry of Health.
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. The American Journal of Clinical Nutrition, 76(6), 1207–1213. https://doi.org/10.1093/ajcn/76.6.1207
Vartanian, L. R., Herman, C. P., & Wansink, B. (2008). Are we aware of the external factors that influence our food intake? Health Psychology, 27(5), 533–538. https://doi.org/10.1037/0278-6133.27.5.533
Wansink, B., van Ittersum, K., & Painter, J. E. (2006). Ice cream illusions. American Journal of Preventive Medicine, 31(3), 240–243. https://doi.org/10.1016/j.amepre.2006.04.003