That's different, you can tell someone is obese because that is basically just fat. You can't tell how tall she is, what her weight is and how much she's eating from a picture. You might be completely right, but you might be wrong.
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I can tell how tall she is roughly by comparing her head to her body. Her head is almost as wide as her torso
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Doesn't mean she's unhealthy, it could easily be a birth defect.