Interesting take. Still, the first woman may be as skinny as she is because she has an eating disorder (not that she does, she may). The long term effect of an eating disorder is pretty horrible, physically (and emotionally). The woman in the middle seems to have the healthiest lifestyle, assuming we're playing to averages.
Still, a lot of that strikes me as oversimplification. The third woman may maintain her weight via diet and exercise. The first woman may simply have the thin phenotype. The second woman may even be plastic.
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