Depends: "ideal weight" is subscience / entertainment. "increased mortality in underweight people" ignores the cause; merely being light-framed and lean is not a health risk. Elite runners with no bodyfat and efficient muscle are "underweight" and in superb health. Justin bieber (photo) isn't complaining. Stay physically fit, get rx if you are actually sick, and enjoy your natural body type.
Answered 12/10/2013
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