Two quite bizarre statements from two doctors.
1. Food takes fourteen days to pass through the intestines.
The guy has obviously never eaten sweet corn. Or figs.
2. Bananas have no fibre in them. You are better off eating an apple.
Both are good but, weight for weight, a banana has more fibre than an apple.
Really makes you worry about their medical advice but then it is not uncommon to see people who are quite talented in one area being interviewed as experts in another. And being believed in the second for no reason other than they are capable in the first.
But it is still depressing in this case. I would expect doctors to know better.