Outside Pittsburgh, they are proclaiming a strike, taking to Twitter and Facebook to spread the word. In a village near Milwaukee, hundreds staged a boycott. In a small farming and ranching community in western Kansas, they have produced a parody video. And in Parsippany, N.J., the protest is six days old and counting.

They are high school students, and their complaint is about lunch — healthier, smaller and more expensive than ever.

The Healthy, Hunger-Free Kids Act of 2010, which required public schools to follow new nutritional guidelines this academic year to receive extra federal lunch aid, has created a nationwide version of the age-old parental challenge: persuading children to eat what is good for them.

Because the lunches must now include fruits and vegetables, those who clamor for more cheese-laden nachos may find string beans and a peach cup instead. Because of limits on fat and sodium, some of those who crave French fries get baked sweet-potato wedges. Because of calorie restrictions, meat and carbohydrate portions are smaller. Gone is 2-percent chocolate milk, replaced by skim.