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Public schools are very highly regulated. Lots of federal regulations.
From 2012 until very recently, it was illegal/against the regulations (if you took federal money, which all public schools do) to serve whole milk in schools. It had to be skim milk or skim chocolate milk. And no kid is going to drink skim milk when they can drink sugary chocolate milk.
this territory is moderated
I suspect kids are also choosing whole chocolate milk over whole milk, as well, but I take your point.
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