Couldnt you say this for lots of diseases, eg. Fasting glucose > 7 mmol/L or BP > 120/80 mmHg or smoking 20/d might be ay okay for some, but on average this is bad for health...? Also i thought BMI was designed by insurance companies exactly for health demarcation reasons?
Not sure of other examples, there may be some, but the argument is that there's no utility to having the cutoff set at 5.7, setting it at 6 allows us to better target people in need, and those who are 5.7-5.9 are at a very low risk anyway
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pre-DM criteria is currently 6.1 to 6.4 for A1c, 6.1 to 7 for FPG. <5.7 may be "optimal". T2D is heterogenous but pre-DM even more so -- some pre-DM resolve on own but others sinisterly progress w/ ongoing loss of beta-cells.
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Depends on whether we're using the European or American criteria
End of conversation
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. The rest is speculation.
Weight-height tables were used by insurance companies to predict mortality. This is an associative, not causal relationship.
BMI has a long & twisted history, with an origin in stats, not biology. See Hite & Carter 2019.