Good grief.
1:00pm?????
This sounds really, messed up.
Even for an adult, eating at 1:00, can really be late... and even me, I am STARVING by 1:00pm, even if I had a GOOD breakfast.
Call the school, or go there yourself and speak to the Principal.
Some kids, get HYPOGLYCEMIC... if they do not eat, for a certain period of time... or, they get HUNGRY, and can't concentrate or get irritable and their attentions spans and behavior is affected, by not eating in a reasonable amount of time.
For, example.
Don't the kids, get recess???
At recess, can't the kids have snacks?
At my kids' school, the kids bring their own snacks, and at recess, they can eat it. It is up to the parents & their responsibility, to send their kids to school, with DAILY water (in a water bottle), and snacks for their kids. AND as well, snacks for their child... IF their child is in after-school care- because kids in after school care are not picked up by their parents until about 5:00pm, or later. A kid, cannot go that long without a snack... from lunch time to evening.
At my kids school, the latest lunch per grade is, 12:15.
You said that at school "they do not get a snack or anything before that..."
BUT... can't the kids bring their OWN snacks? And if so, when do they get to have it? Again, at my kids' school, it is at Recess periods, that they can have their snacks.