I don’t agree. I’m better versed in politics than most and HN comes across as naive about it, but not crazy.
Nutrition seems a whole new ballgame. I’m going to speculate it’s because we know pretty much nothing about nutrition, and to hackers that’s unacceptable. We like to know the rules so we can hack them. But in nutrition no one even knows the rules, maybe the rules are different for different types of people, and that’s deeply unsatisfying.
HN has crazy takes on everything not within the very narrow sphere of tech expertise that is common to everyone on this board.
You notice it for diet-related things since you are a (relative) expert on that topic.
But it's also the case for anything economic, political, scientific, or sports or hobby related, and so on.