https://cholesterolcode.com/

Dave Feldman interviews Ivor Cummins here. Around 1:44 Ivor talks about a study with kidney disease patients and their levels of TMAO--kidney patients with high TMAO experience dramatic decreases after transplant. Kidney disease is a strong driver of atherosclerosis, so a possible confounder when TMAO correlates with heart disease...

Anyways, a good interview to watch, even if it does mention TMAO.

The bone broth--if it was indeed proposed as a sole food, I agree there, I remember saying that here back when that all went down. I think the formula included some liver as well and there was the question of whether vitamin A intake would be excessive.