[adam_arthur]

Yes it is but most of the studies use it, so that's the data we have.

And the OP implicitly referenced these studies in his claim that being overweight could be healthier (which comes up in BMI studies of elderly people that don't sufficiently control for confounding factors)

[IndySun]

It was my intention to add some background detail, for anyone not aware, or wanting a side dive, about how BMI stands 'these days'. As such, it can be said the variables may be considered wider than they may appear at first (in the article conclusions). Which is a roundabout way of saying we all 3 are agreeing.

Je n’ai fait celle-ci plus longue que parce que je n’ai pas eu le loisir de la faire plus courte.