Ironically given the topic, the very first sentence on the page ("The size of your plate can influence how much food you eat.") is based on observational research that has not replicated in controlled studies.
[0] https://pmc.ncbi.nlm.nih.gov/articles/PMC2129126/
[1] http://link.springer.com/article/10.1186/s12966-019-0826-1?u...