I was going to reply and complain that it was pancreatic cancer. But after fact-checking a bit, I see that fruits and fruit juices seem to have been linked to pancreatic cancer[1], and there may be some truth in your claim. TIL.

[1] https://academic.oup.com/ajcn/article/86/5/1495/4754408

Exactly. Eating only sugar and some Vitamin C and some fiber you cannot digest is not a good diet. Most of the fruitarians you see on Internet are aging and dropping like flies. The lack of proper macronutrients drive them crazy, since their brain cannot function. Just do a search on Youtube "I'm ex vegan" you will hear the stories of the people who escaped different types of veganism, specially the fruitarian one.

Well by definition, something that kills you is less than optimal (unless death is your goal).

Less than optimal has the connotation of being sufficient, but requiring more resources than strictly necessary.

My original post was about the author's bias, not about fruitarianism. My "less than optimal" comment was a gentle, intentionally non-confrontational effort to return the focus on bias rather than the specific diet. Clearly my effort failed.

That and not using proven treatments for cancer.