Can I ask your opinion on a (somewhat) related recent book? (specifically, it has examples about succesfully using diet changes instead of surgery, for people w

Can I ask your opinion on a (somewhat) related recent book? (specifically, it has examples about succesfully using diet changes instead of surgery, for people who were already scheduled to have heart surgery). Namely "The Plant Paradox" by Dr. Gundry. From what I found he is (or used to be) a well-respected heart surgeon with some influential papers on his name. But I could find just a few summary articles on his current research program, which focuses on diet, foods with lectins in particular, and their relation to auto-immune disease, obesity, heart problems, and more. I found the book very interesting, and his theories seem plausible to me (someone with no medical background whatsoever). But I also got the impression he may be overstating his case a bit, over-generalizing, so I was wondering about the opinions of medical experts on his work.