If one is worried about obesity related health problems, a 5’11" person should consider whether his/her waist circumference is under 35.5" (half his/her height) or if it has been increasing or decreasing. Height and weight alone are not a perfect indicator of whether an individual is obese, because there may be people of the same height and weight where one is lean and muscular, and the other is high body fat (even in the “normal weight range”, such people are prone to obesity related health problems, called “normal weight obesity”).