army1987 comments on Outside the Laboratory - Less Wrong
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We know that low-carb is effective at losing weight. The jury is still out on whether low-carb is healthy in the long term.
Similarly, while it is clear that being obese is unhealthy, I don't think that there is any evidence to show that being very thin (having low body fat %) is healthier than being normal.
See here, though it uses BMI rather than body fat %.
Yes, and it does show the expected U-shaped curve.
BMI is pretty useless as an individual metric, though.
That was the point. (I also incorrectly remembered that the minimum was shifted a bit to the right of what's usually called “normal weight”, i.e. 18.5 to 25, but in the case of healthy people who've never smoked it looks like that range is about right.)