I literally watched that documentary the other day, it is from the same maker as 'Cowspiracy' (which is a documentary that I cannot
recommend it enough, it's about the environmental effects meat production, and how global warming could easily be reversed if the whole world reduced its meat consumption)
I am torn, on one hand, the guy obviously must've done his research, everything is backed by information gathered from academia, scientific papers, etc. However, the fact that is is backed by AN academic paper, or A study doesn't make it necessarily reliable: his main source of information are 'Prospective cohort studies', which, as fancy as it sounds, has many limitations, so what he backs his information on is something I'm not 100% convinced about.
I am also slightly sceptical as he is condemning everything, almost every food group (except plant-based foods) that we have ever eaten. That seems a bit extreme. As I do for any 'controversial' documentary/article, I researched around and found a LOT of criticism on it, with many people calling it 'vegan propaganda'. Obviously you need to take everything you find on the internet with a pinch of salt, but I found this criitc particularly insightful (https://robbwolf.com/2017/07/03/what-the-health-a-wolfs-eye-review/
I firmly believe that the human body can get absolutely everything it needs from having a vegan diet (you just have to be very, very, very careful about what you eat and in what quantities, it takes a significant effort but if you want to do it well then that's what it requires)
But the guy is basically saying that: fish are bad, eggs are bad, this is bad, that is bad, and as much as I LOVE those types of documentaries, I did feel like he took that to an extreme. Both my great grand mothers lived until the ripe old age of 95 and 101, and they both had a diet that the maker of the documentary absolutely condemns, so I am very skeptical about it.
He raises interesting points, about what food does to our health, and to a certain extent it's important to be aware of it. But whilst these food can potentially be 'harmful' (and that is also debatable, as there is a very limited number of these studies), it also contains a lot of good
nutrients, and that is something which is seems to overlook.
I think this documentary, albeit slightly biased, was interesting, but wouldn't convince me to switch to a plant-based diet.
NB: he made this other documentary which -again- I cannot recommend enough, 'Cowspiracy' (can easily be found on Youtube), about the beef industry and how it's destroying our planet