Yeah, I recently worked with a cardiologist who eats a pretty weird diet - don't remember all the specifics, but he won't touch shrimp or eggs at all because of the cholesterol. I heard he read some sort of study that he felt really strongly about and chose to base his diet on the findings. I wish I knew what the study was, I didn't spend too much time with him directly, so I couldn't just randomly bring it up, but everyone on the ward was talking about his "weird" eating habits.