We might even find something more sophisticated than fat percentage. Not all fat people are ill/heading towards illness. Not all thin people are healthy.
Accumulation of fat to vital organs like the liver could be a better predictor. Fatty liver can be diagnosed via ultrasound, which is cheap.
Being fat is a risk even if you get sick for other reasons. Rehabilitation suffers.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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