Rosechord:
The opinion of a layperson (regardless of any "deep research" they do, whatever the hell that means) is not equal to that of a doctor who has devoted many years to just learning enough to be able to legally practice at all. I love this fetish, but I'm not anti-science.
My opinion beats my doctors opinion on me.
This should be true for anyone.
People should not believe doctors without doing research. Believing people gives them the power to lie to you, which they will.
It is not anti-science to demand scientific proof of science. You are wrong if you suggest that science is something we should all believe. No one should believe a scientist since that's the total opposite of science.
Health is always a compromise since we all die in the end. The idea is to optimise your life to get the most of what you want from it. This is not always what the doctor thinks you should want.
The healthy at any size is relative. You can be fat and healthy but perhaps not as healthy as you'd be if smaller.