As often stated, BMI is an average view over the whole population.
It is not an absolute definitive guide, but is a reasonable pointer.
There will always be outliers, including lean endurance athletes who seem under weight and power athletes who seem over weight.
I am not a fan of the expression "exception which proves the rule", but the outliers tend to reinforce the general guidance.
It used to be "Well, I weigh the same as Geoff Capes and he isn't over weight." whilst disregarding the general ratio of muscle to fat and overall level of fitness.
With regard to some of the reported advice over weight loss, I was advised by Prof. Taylor that BMI is not a good guide, and that one target for T2s should be to have the same weight and waist measurement as you had in your late teens and early twenties. This doesn't guarantee anything but gives your pancreas a good chance to fight back.
Hasn't worked for me but then I was probably about 10 years too late.
Probably wouldn't work for the current generation of teen/twenties.
Depending on your sources (Express or Telegraph) one third or one quarter of teenagers are over weight or obese.
So presumably BMI becomes a more reliable target again.
@Rachox your current weight seems to give you an excellent metabolic result!
However I suspect that unless you are a weight lifter and all muscle that you could benefit in future proofing your body by losing more weight.
As suggested a test for IR might be instructive.
If you pancreas is over producing insulin that may not be good in the long run.
It doesn't really apply to me but my feeling is that if weight loss reversed diabetes symptoms then you have demonstrated a vulnerability due to excess weight.
You need to work out if you have reduced the vulnerability enough for your BG control to work again (but still have metabolic syndrome like many of the undiagnosed) or if you have completely eliminated all factors including over production of insulin and consequent insulin resistance.
Either way, well done you.