You're right Lee Bee, children do not like to change their routine or be disrupted when there still things to do. I personally do not think as a "LOVE" for the caregiver. Analizing well I think it is most the "love" they have for each other for every little friend "love" for enjoyment of their activities at the daycare.
I also do not agree with a bribing a child but, offering a healthy food at any time would it be considered bribing? Parents in my group are very councious about good nutrition and physical activities (we have a nutritionist on board). None of them will come with cookies etc. Especially, when they know that their child will have supper shortly. I have a group of boys and as we know they can be a bit more active they burn a lot energy. The growing process also demands a lot healthy foods. I can not generalize each one is unique some need more food than others. Just like us (adults). Now if I can just get half of their energy will be amazing.