Misperceptions of Soda Serving Sizes – NYTimes.com

A good description of our limits in judging serving sizes. Quote:

The reason comes down to the fact that the human brain has a surprisingly tough time with geometry and often can’t accurately gauge when an object has doubled or even tripled in size. It’s even trickier when the object is a wide-mouth cup, larger on the top than the bottom. “We tend to underestimate the increase in the size of any object,” said Professor Chandon, director of the Insead Social Science Research Center in Paris. “When you double the size of something, it really looks just 50 to 70 percent bigger, not twice as big.”

Misperceptions of Soda Serving Sizes – NYTimes.com.

And for those who want the quiz (and yes, I also underestimated the quantities):

The Well Quiz: Supersize Soft Drinks

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