The more meat/dairy/eggs you eat the unhealthier you become. Eliminate plants and eat heavy animal products and see how sick you become. But the opposite can’t be said for vegans. Also these Keto people are destroying their organs. Keto is bull**** and extremely unhealthy.
You can die from too much water too, and eating too much Broccoli (or cruciferous veggies) can lead to hypothyroidism. Of course, this is more rare, but point being, moderation is key. A balanced way of eating with no restrictions is always my motto.
I know people who had terrible keto results and others had terrific ones. Some love veganism, others tried and hated it.
Ask Mikhaila Peterson about the Carnivore diet, she says it's the only diet that has helped her remedy her many chronic auto-immune health issues. I would never advise someone to do this, but hey, apparently it's worked wonders for her.
Moral of the story here is, nutrition is very individual. That's all there is to it. The common folk should stop preaching restrictive diets to others as if they know anything about the matter just because they watched a couple movies...
Personally, if I had to advise a specific diet, I'd tell people to eat the Mediterranean way. It's the most inclusive and nutrient rich.