I'm a fan of school breakfasts, snacks, lunches, etc. Think it should be a state thing, not a Federal thing so they can end the administrative stuff that costs, and use those monies for more food. Also, that the schools determine what to serve, ending gov't interference where pizza sauce equates to a vegetable, and, all the cheese and dairy and soda pop, etc. ad naseum. The café workers know what to serve. Let them decide!
Match this article with the "science" marchers one and consider the money spent on studies "proving" the value of meals to learning. (duh!) The article above references 86 (!) articles in support of their linked exhaustive scientific treatise  in "Frontiers of Human Neuroscience" asserting this value.
I simply believe people who say a child learns better when fed. No $upporting $cience needed! At least it's the British paying for that "$cience" instead of us. Use research grants for something useful instead of what is already known. Or, for more food!