High school students are grumbling over their school lunches–and so are their stomachs, U.S. News reports. Their complaints aren’t about mystery meat or inedible entrees. Instead, students are staging brown-bag protests and filming YouTube videos to voice their frustrations over portion sizes. New federal guidelines cap school lunches at 750 to 850 calories for high school [1] students, down from the previous 825-calorie minimum requirement, and double the amount of fruits and vegetables teens get when they go through the cafeteria line. Teachers and students say the guidelines, which rolled out nationwide this school year, don’t give students enough fuel to get through the school day [2], much less sports and after-school activities…