"They didn't have gluten free bread in the past so we don't need it now"
They died. People with celiac disease just died. About 30% of all children died. Doctors were baffled for hundreds of years by malabsorption, until things like the banana diet ~1924.
"We never needed vaccines before"
People just died. About half of the world population died from the plague. Vaccines save lives - just look at mortality graphs before and after vaccines were introduced.
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This doesn't justify every superfood fad and health scam like lion's mane mushroom, detox or antioxidants. What separates pseudoscience from what to trust is meta analyses (study of studies).
Next time there's a new product promising a quick fix, do the research.
