waveman 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).
Do you have a comparison study which included hip/waist as well as body fat percentage?
I have some doubt that your claim is true because the distribution of the fat seems to be very important eg fat around the hips is far less damaging than fat around the abdomen.