wouldn’t you agree that after a certain point (bmi>30) that it is a pretty good indication of obesity?
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Only if you define obesity strictly in terms of weight without regard to percentage of body fat or muscle. According to BMI I am obese but a huge percentage of my weight is in my shoulders, chest and arms, I have a large bone structure, a large head, a thick muscular neck etc. I wear a size 52 coat and size 38 waist pants. I would like to weigh less than I do but I am not obese. In fact if I were to drop down to the maximum that the doctors say I should weigh I would look rail thin and people would be thinking I am in the last stages of cancer. Actually I believe that the BMI index would indicate that Brad Pitt is very overweight if not indeed obese. I know a young man who regularly runs marathons who is 5 feet and 10 inches tall and weighs 205 pounds, according to his BMI he shouldn’t be able to walk five miles, let alone run 26 miles.
but over 30 BMI...there’s a limit to how much muscle and bone you can build up per a certain height.
Now maybe the formula could take into account shoulder length...I have broad shoulders...I know what this feels :)
Or perhaps another way would be to measure waist size.
http://www.sciencedaily.com/releases/2005/03/050325150149.htm