Neither am I a scientist. I’ve read various books, papers, etc., and have been my leanest on a diet around 50% carbs, 30% protein, 20% fat. Also helped others while I was in the military get ready for team qualifcation, annual testing. Got in shape for some endurance events, did well. Did compete in a bb’ing contest once – mediocre genetics – so one and done.
Regarding Fung, I’d suggest calling them “clams” is a misrepresentation – if you haven’t read his references and work with his patients, then, I don’t understand how can dismiss them as BS.
Yet you note you’re not a scientist or MD (nor am I), but, said there has never been a problem with anyone’s metabolic rate. So assuming, you didn’t take bloodwork? Test factors that determine an individual’s metabolism before/after?
And Fung’s “views on nutrition” --he does encourage low carb, but, he also states in one of the books I read whole/complex carbs such as legumes are acceptable. But, he is very, very much against fructose and processed carbs – especially fructose because of its affect on the kidneys to include inflammation and other issues (he’s a nephrologist). Not mainstream, for sure, as it goes against the Standard American Diet.
If you haven’t read his books (have read three loaned me), watched his videos (also a couple of movies he’s in such as Fasting on Prime), etc., your statements appear to be misrepresenting Fung (and other MDs) regarding his information and recommendations.