This is not the first time a robber has been put on a diet of bananas - in 2007, police used a similar method to extract a gold necklace from a thief in eastern India. And last year, Mumbai police fed a man 36 bananas to retrieve stolen property
I learned this from when I used to be trained to set up and run emergency shelters for the Red Cross. Bananas were never one of the food items you chose one way or other depending on what was, or wasn't, coming out of the balloon knots of your residents. If anything, you primarily chose bananas more as a natural nerve relaxant because of their potassium.