Given that you have already made that choice, I'd recommend "How Not to Die" by Dr. Michael Greger. One of my biggest criticisms of Greger is that he is ignores any study that shows benefits of eating animals, even for specific conditions. People who would like to continue eating animals would find it easy to dismiss Greger for being so one-sided in what kinds of studies he cites. However, if you've already made the choice to prefer vegetarian, Greger's book (and videos) are an easy recommendation.
Here’s Greger interviewed. He literally takes the approach you are wanting. Going all out on just reading tonnes and tonnes of research infact there’s a whole team of them doing it and summarising every few years.
I’m sure there are better podcasts but this is the one my partner got me to listen to where he’s interviewed.
Given that you have already made that choice, I'd recommend "How Not to Die" by Dr. Michael Greger. One of my biggest criticisms of Greger is that he is ignores any study that shows benefits of eating animals, even for specific conditions. People who would like to continue eating animals would find it easy to dismiss Greger for being so one-sided in what kinds of studies he cites. However, if you've already made the choice to prefer vegetarian, Greger's book (and videos) are an easy recommendation.