Wow Skysue! Sorry you took some unnecessary grief on this thread! If it were me I would never turn a family away unless there were severe allergies that would affect my daily meals. But I have a feeling you serve nutritious food as I do, with just an occasional treat on a special day. I would continue to do that if I were you and keep providing lots of exercise for all the children as I'm sure you already do. My only concerns would be that the child would have to be healthy enough to walk at least a kilometer to a park, then play and walk back because we travel almost daily to the library and several parks. Otherwise, I wouldn't have any problems.
We can't control what the parents do, we can only make gentle suggestions. So I really like your idea of a nutrition section on your newsletter to try to help the parents. That's the same as giving little suggestions for any issue, food, naps, toilet learning, behaviour issues, etc. Yes, I think that's part of our job to try to educate the parents gently without offending.
I know I have some parents who feed their children junk food at home but I will continue to feed them all their nutritious food groups at daycare. I know there are some parents who use a lot of tv at home, but I'll continue to make sure the children get lots of activity at daycare. That's all we can do then we have to remember, we're in charge for our 40ish hours a week, then the parents are in charge and responsible for their child's health.