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ChristianKl comments on What information has surprised you most recently? - Less Wrong Discussion
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I'm underweight. I personally use calorie counts in food to choose food with a higher amount of calories. If there are a bunch of people like me and a bunch of overweight people who pick lower calorie food, the average will still stay the same.
There are not nearly as many people like you compared to those who are overweight, or even those who are overweight and on a diet.
Yes, but there no reason to think that underweight and overweight people use the calorie information in the same way and in the same frequency.
If you just know that the average calorie consumption stays constant, you don't know whether some people changed their calorie consumption.
http://meps.ahrq.gov/data_files/publications/st247/stat247.pdf
I wasn't saying they use it in the same way. I was saying that the number of overweight people is so much greater than the number of underweight, that it would be incredibly unlikely for it to cancel.
The data that got brought forward suggest that nearly no overweight person actually uses the data.
If 0.5 million overweight and 0.5 million underweight people use the data than the average is zero.