"How not to die" is written by Dr. Greger, a devout and somewhat militant vegan. I used to listen to his You-tube channel which, at first appearance, is research-based nutrition information. However, if you scratch below the surface and read the original papers you will often find that he has slanted the interpretation to be pro vegetable based, while ignoring the sections of the same papers that could be interpreted as pro-dairy or pro-meat. His work is a case study in confirmation bias.