"research is questionable" - but that's precisely the point. If you look at a piece of research which is badly constructed, and you can expose HOW it was flawed, then of course you can question its validity.
But by the same token, if a study takes large enough numbers and controls for confounding factors, and is statistically robust, and peer reviewed, then you can't just dismiss it out of hand without looking like you are dismissing the truth because you don't like what you hear.
If I flip a coin and it lands heads up 5 times in a row, it doesn't follow that the probabilities of 50:50 must have been wrong does it? It just means I beat the odds on this occasion.
The more I flip the coin, the more likely I can predict wth certainty that the total tally will be 50:50.
The same applies to good research, and large population studies.
When you dismiss ALL research as questionable, it's kind of an unfounded prejudice based on ignorance. "Research-ism"
Some is bad and can be demonstrated to be bad. But plenty more research is good and can't be dismissed so easily.