Labeling the amount of calories in food (for example on McDonald's restaurant menus) totally fails to change people's eating behaviors at all
How is it supposed to change people's behavior?
I know If I read nutrition information in McDonald's it is to figure if I'm getting enough calories from my food (often I don't). I might be more willing to eat at a restaurant where nutrition information is easily available, but is that the change you had in mind?
People eating fewer calories.
Information that surprises you is interesting as it exposes where you have been miscalibrated, and allows you to correct for that.
I suspect the users of LessWrong have fairly similar beliefs, so it is probable that information that has surprised you would surprise others here, so it would be useful for them if you shared them.
Example: In a discussion with a friend recently I realised I had massively miscalibrated on the percentage of the UK population who shared my beliefs on certain subjects, in general the population was far more conservative than I had expected.
In retrospect I was assuming my own personal experience was more representative than it was, even when attempting to correct for that.