Took them long enough to figure that one out.
Check this out:

After the federal government’s school-lunch standards were overhauled in 2012 in what I’m sure was a very well-intentioned effort to institute healthier habits in America’s children and help stave off of the country’s growing childhood obesity problem, it didn’t take long for the calorie-intake and portion restrictions in the new code to crash and burn spectacularly. Healthy eating habits being the highly individualized needs and preferences that they are, kids and parents quickly began complaining that students were not able to get enough to eat at lunchtime, and in some districts, school-lunch participation began to drop as more and more students started bringing their own lunches to school. The USDA soon implemented a temporary stay on the rules, and they just made the changes permanent — seeing as how the restrictions were never very well thought out in the first place.