brazil84 comments on Lifestyle interventions to increase longevity - Less Wrong
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The best metrics are body fat percentage or fat-free mass index.
For what it's worth, even vaguely muscular people are going to blow apart the BMI scale. I'm 5'10" and 190lbs at around 13% body fat. My normal weight range according to BMI is 130-173lbs. If I got down to that without losing any muscle mass, I'd be 5% body fat, which is severely underweight. I was completely sedentary before weight training, and I've only been training powerlifting for 1.5 years with moderate results (ie, I'm not quite as strong as most high school football players).
For what it may be worth, I am "vaguely muscular" and my BMI of 23.6 seems about right in terms of assessing my level of overweight.. I do agree that muscularity can foul up the BMI scale but I think it take more than just modest muscularity to do so.