The requirement you describe is often why convenience stores have a basket with one or two each of Red Delicious apples, bananas, and navel oranges, with a sign

The requirement you describe is often why convenience stores have a basket with one or two each of Red Delicious apples, bananas, and navel oranges, with a sign saying "fruit $2" It the same sort of dodge as defining ketchup or pizza sauce as a serving of vegetables in school lunches. There's never going to be enough funding to enforce the spirit of the regulation instead of just the literal wording of it.