These last two are definitely not always true.
One would be a fool to assume that medical theory operates solely on what is effective and what is not. Money and government inteference are the major drivers in medical practice. Do companies spend $250 Million to prove that vitimin C is effective at whatever? No. The cost cannot be recouped. Do doctors only perform techniques that "medical theory" say is best, or are they driven by cost or lawsuit avoidance?
Are all equally accepted theories equally valid? Of course not.
People who don't want to give up their suspect theories will ridicule and marginalize those who would question those suspect theories.
I don't know the validity of the Government's nutritional theories versus Dr. Adkins' theories. But I do know that he was marginalized and ridiculed by those whe feared that their theory would be debunked.
I'm new at harassing the evolutionists. I have been busy for a couple of years offending the Catholics. I'm branching out.