Dr Ovadia wrote an excellent book, "Stay Off My Operating Table." It was one of the books that pointed me in the right direction and his advice greatly improved my metabolic health. I owe him a debt of gratitude. It is good to see how passionate he is on the topic.
To paraphrase Dr Kay, when listening to health advice I like to look at the overall affect and presentation of the person giving the advice. It's clear who the healthier of the two is just by looking at them.
I learned from Dr Bikman that insulin resistance also reduces vasodilation, which is required for a healthy erection. I noticed I did not have morning wood often when I had NAFLD, and this was also one of the things I noticed that had greatly improved when I got healthier.