The ban comes after a push from celebrity chef Jamie Oliver, who called out sugary milks on his reality TV show "Food Revolution."
The extra sugar in flavored milk makes it an unnecessary evil, fans of the milk-ban say, considering that one out of three kids in the U.S. is overweight or obese.
Others see flavored milk as the scapegoat. It's a step in the right direction, but there are other culprits in the cafeteria.
"You shouldn't look at one food. You should look at the whole diet," says Becky Domokos-Bays, school nutrition director for Alexandria City Public Schools in Virginia.
At the 17 schools Domokos-Bays oversees, skim chocolate milk is offered in addition to skim and low-fat white milk, and she says all of those options provide kids with protein, calcium and vitamin D. Yanking flavored milk from the cafeteria doesn't guarantee that kids will drink the alternative, meaning they might miss out on nutrients entirely.
And what other unhealthy foods are lurking in school cafeteria?
High-calorie fruit juices are just as concerning as flavored milk, says Mitzi Dulan, a registered dietician, nutrition expert and nutrition-book author. They're sugary, too, and don't even have the protein, calcium and vitamin D found in milk, flavored or unflavored.
Oliver's campaign has spurred a national conversation on the pitfalls of school lunches, Dulan says. But milk isn't the main culprit in her eyes. She's more concerned with choices in the cafeteria line that provide minimal nutrition, such as highly processed foods.
Muffins, corn dogs and hot dogs are among foods that should get the boot, Dulan says.
Curious about what your kids are eating at school?
"When you come and eat with your child (at school), go through the line and see what your kids eat every day," Domokos-Bays says.
If you're interested in speaking with the schools food service director or cafeteria manager, School Nutrition Association suggests asking questions like these:
Lunches brought from home need the same critical eye.
Dulan, whose daughters are 7 and 10 years old, says to bring your children to the grocery store and help them decide what they'd like to see in their brown bag. Start in the produce section and ask open ended questions.
"Say, 'What healthy snacks would you like to pack in your school lunch?' Using that verbiage with your kids puts them in control," Dulan says.
Here are Dulan's tips for packing a healthy school lunch:
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