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NancyLebovitz comments on Why Don’t We Apply What We Know About Twins to Everybody Else? - Less Wrong
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I've also read that gene expression diverges in twins over time-- so if a lot of the difference in body composition is about gene expression, there might be a few pairs of twins where, just by chance, either the willpower or the fat storage changes kick in earlier or more strongly.
"Willpower" is not just one thing-- there are people who can't stick to diets who show a lot of will power in other parts of their lives, and vice versa.
As a young teen I played basketball with a pair of identical twins. One was fairly slight, the other rather stocky and an inch or two taller. Not sure why.
maybe they weren't identical twins. Unless they did a genetic test they wouldn't know for sure. I read something once that said that a significant number of same-sex fraternal twins are misidentified as identical.
That is very interesting. I hadn't thought yet that the way we identify twins right now is just by looking at them ("they look pretty much the same, they must be identical").