Interesting experiment and thanks a lot for sharing your experience and thoughts! I question several of the arguments of those nutritionists, but this is not meant negatively in any way, since we are all unique bodies and "experts" have different biases too.

However, what stroke me was the "B-12 deficiency" => did you actually get tested? If not the person who suggested that is already not someone I would take seriously. Especially since you seem to eat a fair amount of animal products and don't seem to be an old man yet (not sure if you have any inflammatory bowel disease, which could make b12 deficiency likely, but if you had then legumes would be a no-go, so...)

Thanks again for this cool write up and sharing what you have learned! :) Very much appreciated.