I don't do special diets. If the parents have specific needs, I tell them in the interview, they will have to provide all foods. I have never had a parent take me up on that
They all send in a sack lunch and I provide snacks. I don't keep track of who ate what, what I served and I don't promise organic fruits or anything special. I do my best to avoid junk food but I am not going gluten free for a daycare family that shows up with a sack full of junk food.
I don't know ANY daycare parents that have been committed to super strict healthy diets. There are some that have tried harder than others but none of the ones that was really adamant about special diets every stuck by their own plans when I would not accommodate. I had one mom make her daughters baby food and this child NEVER ate, literally was here about 6 months and rarely ever at my house. She hated the food mom sent and/or she just refused to eat for me. I threw a lot of homemade food away.