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Your analysis is incorrect.
Normal weight people are grouped with normal weight people. Underweight people are grouped with underweight people. Overweight people are grouped with overweight, obese with obese.
Who lives longest?
Overweight.
Next, normal.
Then obese people.
Then, with the shortest lifespans of all, the underweight.
Sorry about those facts, buddy. I know they get in the way of your prejudices.