Yes, but it will only have health benifits for all if they are compolsory and the DCs eat them.
And I can assure them that DD2 would happily go hungry rather than eat a meal she doesn't like.
Just as she can and does go thirsty if water is the only drink on offer.
Personally, I'd much rather they laid off worrying what DCs eat and concentrated on teaching them.
Children's diets are not schools job, they are parents. It makes fuck all difference if a DC eats a brown roll and an apple in school, but coke and a mars bar for brealfast and MacDonald's for tea!