today at 191 pounds, he s still overweight, but his doctor s orders don t worry about shedding the pounds. fat is not always the devil. reporter: it s a radical point of view in our weight loss-obsessed society. where the body mass index uses your height and weight to determine how overweight you are. 25 or higher, you re overweight. 30 and up, you re obese. roger s bmi is 29.4. dr. carl lavee wants americans to stop fearing fat. linebackers in the nfl would all be considered obese by the bmi method and have hardly any body fat. they re almost all muscle. reporter: he s written the obesity paradox, saying focus on fitness, not thinness. it s much more important to be fit than it is to be thin if you re trying to improve long-term health. you re doing good, roger. thank you, sir.
today at 191 pounds, he s still overweight, but his doctor s orders don t worry about shedding the pounds. fat is not always the devil. reporter: it s a radical point of view in our weight loss-obsessed society. where the body mass index uses your height and weight to determine how overweight you are. 25 or higher, you re overweight. 30 and up, you re obese. roger s bmi is 29.4. dr. carla bee wants stop fearing fat. linebackers in the nfl would all be considered obese by the bmi method and have hardly any body fat. they re almost all muscle. reporter: he s written the obesity paradox, saying focus on fitness, not thinness. it s much more important to be fit than thin if you re trying to improve long-term health. you re doing good, roger. thank you, sir. reporter: the doctor says roger is fit because he can walk a mile in under 15 minutes. he works out four times a week,