Because breakfast is not an «offer vs. serve» meal (i.e., students must take all parts of the meal for it to be reimbursable by the federal government), there's a huge amount of waste, and one of the most valuable aspects of Lisa's blog has been her photos of the untouched
food routinely
discarded by the students from the breakfast — tables full of sealed milk and juice cartons,
uneaten whole fruit and unopened packaged
foods all headed for the trash (see, e.g., here and here).
The problems they chose included students throwing away
uneaten food, using plastic water bottles instead of reusable bottles, and
discarding paper instead of erasing mistakes.