Primary school says kids should only have fruits or veggies as snacks, "proved" to be better for concentration/focus. What does science say?

Of course kids should eat healthy, but a quick web search seem to disprove that higher calories snacks have a negative effect. Papers I found are https://www.sciencedirect.com/science/article/abs/pii/0195666390900519 and https://www.sciencedirect.com/science/article/abs/pii/S003193840200882X

School goes as far as preventing the kids to eat their snack if it’s not a fruit or a vegetable which I find excessive, as many healthy snacks exist today that still contain some (more) carbs (the two papers are even about candies…)

Are there some studies out there for what would be an optimal snack (both health and performance wise)?

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