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As you say, there are a lot of these connections, another is increased religiosity with neurological disorders like epilepsy and schizophrenia.

SSRIs, birth pills and other 'harmless' drugs modify behaviour too.

Fwiw food and lack thereof modifies behaviour too.

If I fail to eat regularly for about 3 days I sink into a deep funk which takes a few days of regular eating to come out of.

I used to/have a problem where I just don't have the energy to eat due to being hungry and its a viscious cycle.

What happens when you fast?

Isn’t that failing to eat regularly?

No, because it's done intentionally.

This idea has grown on me a lot after watching Sam Harris’ 2013 Ted Talk, on deconstructing religion, logic and morality: