Isn't he completely anti-meat / pro-vegan? His research is cherry picked to a large part and he usually cites epidemiological studies. At least he did when I got into nutrition.

Reading multiple books and doing research yourself is to recommend, at least there's one book with a whole website about the research used in each topic. ---> Boundless by Ben Greenfield.

I also highly recommend Dr. Greger's work! He also has a podcast and very informative website with tons of sources and further information.