Perceptions of normal portion sizes have changed over the past 20 years.
One cause may be Portion Distortion, which is when large portion sizes are perceived as an appropriate amount to eat at a single sitting.
A recent study out of Rutgers compared what people currently perceive to be a typical portion size to what was perceived as appropriate two decades ago.
Over 175 young adults were invited to select typical portions of eight meal items for breakfast or six for lunch and dinner. Their selections were compared with a similar study conducted 20 years previously.
The foods with the greatest difference in portion size between the two studies were those served and consumed from a cup or bowl. Servings of orange juice, cornflakes, and milk increased by 40, 20, and 30 percent, respectively.