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If your BMI is 28 and you are strong instead of overweight, you'll know it easiily by just your athletic performance. Can someone really be healthy with such a BMI without significant physical activity? If you are running 10 miles a week and have a high BMI, you won't mind if Wii fit says you are fat, because you know it's wrong.

If anything, the cold, hard BMI can show anorexic woman that they have a problem.