I've done hosting (slightly different) & despite knowing food likes/dislikes, allergies/intolerances etc before arrival I often wasted so much food. Mostly young students they had breakfast, we're driven to pick up points, collected later and given evening meal. Usually had pairs so they would have company of same age. I had some lovely students but after a few "difficult" students decided to host the teachers instead. This was much easier, they enjoyed all the food, were good company and some I've visited in their country as we have stayed in touch. Have to say (from my own experiences) the French were the most difficult and the Japanese the best.
really?