I remember him initially being sort of balanced and reasonable then he started pushing supplements etc. Then a few years later, he started showing up in infomercials pushing all sorts of crap.

I liked his cookbook, I presume it was ghost written.

His usual shtick is to have a guest on who promotes quack notions and he just sits there pitching softball questions without challenging the BS coming from their mouth. That gives him cover when Congress calls him in to testify about misleading the public.

50% of what he says is wrong or fake...

https://futurism.com/50-dr-oz-says-no-evidence-contradicted-...

There is also this

"Other nutrition research critics, such as John Ioannidis of Stanford University"

There is a good appeal to authority for you.

John Ioannidis is a critic of bad clinical research in general, not just nutrition. This is his most widely cited paper on the topic.

Ioannidis JPA (2005) Why Most Published Research Findings Are False. PLoS Med 2(8): e124. doi:10.1371/journal.pmed.0020124

https://journals.plos.org/plosmedicine/article?id=10.1371/jo...

Ioannidis has zero credibility at this point.