I think it works and makes people more conscious of the effects of what they're eating.
Maybe it's because I mentioned it to them a few times when they got a bit plumper than I thought they should be, but my two boys 12 & 13 years old seem quite in tune with such nutritional data and when we are in the fast food joints they often mention the calories, fat, etc. and how it relates to what they're ordering. I also hear their friends mention it sometimes.
On a vaguely related note, I heard a story on NPR this morning talking about data showing that keeping the room you're in at say low 60F range vs mid 70F range causes you to burn up a few hundred extra calories and this can actually be significant in a weight control/loss plan. So I figure if they keep the inside of the local McD's at 60F I can eat an extra Big Mac!
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