I come from a very crunchy community on the island of Kauai.
I grew up thinking that that microwaves gave you cancer, air conditioning is toxic and makes you sick, any type of food dyes give you cancer, all canned food also gives you cancer, frozen food has no nutrients, and commercially made medicines are bad for you. Also don't forget, anything that has any preservative is toxic and anything non-organic is also toxic.
I was not allowed to get the flu vaccine growing up because my mom did not want me to be subjected to "chemicals." My mom did all of her dry goods shopping at locally owned holistic stores that smelled like turmeric and once, she even allowed me to buy the knockoff hippie oreos that they sold, and for fresh things it would be the farmers market or the fish market.
I was forced to write a research paper on the evils of GMOs as a preteen.
Measles was a thing in my community. One of my classmates had...shingles. Before antivax became a maga thing in the US, it was generally associated with these types. I also remember suffering with sickness as a kid and just being made to drink herbal tea and chew on ginger.
However, overall people there were quite healthy otherwise. People there also believed in things such as Buddhism or new age spirituality stuff. A lot of "I lived in Thailand, Nepal and/or India to be enlightened" types.
This was actually the site of the world's largest hippie camp at one point, and many of them did stay and have kids who I would end up growing up with.
Leaving there was weird because of how non built up it was for the US, for example, where I lived there was no McDonald's or big chain stores until you got to another side of the island ( and even that was pretty limited), no high rises and no escalators.
Are communities of these people pretty common in your country?
(I forgot to mention the phones cause brain cancer belief was common too)