Jobs's diet came from a 1971 book written by a very convincing yet irresponsible man who got kicked out of teaching at Harvard (this isn't actually a joke; Steve's comments on the book Be Here Now suggest exactly this, and I definitely can't blame him).

His diet and his refusal of treatment was what killed him.

For some reason I doubt Trebek is the easily-swayed college student Jobs was when the ideas that got him killed overtook him.