van Ittersum and Wansink (2012) have shown in one study that when people are asked to pour soup into a bowl so that the diameter of the soup is 9 cm, they make the diameter about 10 cm when the bowl has a diameter of about 30 cm and a diameter of about 9 cm when the bowl has a diameter of 18 cm. They found similar results in other studies and also showed the influence of the colour of the bowl or plate and of the colour of the tablecloth. That is, van Ittersum and Wansink found a similar result to ours when people serve food.

I regret that my co-authors and I were unaware of van Ittersum and Wansink's (2012) paper when we were preparing this one.

Reference

van Ittersum, K., & Wansink, B. (2012). Plate size and color suggestibility: The Delboeuf illusion's bias on serving and eating behavior. Journal of Consumer Research, 39, S20-S33. doi: 10.1086/662615

Robert P. O'Shea

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