It really depends on what you mean by nutrition. You aren’t getting a ton of mongrels minerals and vitamins compared to a lot of things, but it’s not devoid of such. It’s not horribly calorie dense, but has a decent balance of fats and carbs overall. It’ll fill bellies and keep you going.

As far as taste, it wasn’t even about income levels of the district/school. It’s about the combination of supplies and cooks. For real, school cafeteria staff don’t get the credit they deserve. They turn institutional food into something that feeds a ton of kids. But if the contract for supplies is to a shitty company, even the best can only do so much. And not every cook is equally skilled at making the best of the supplies.

I wouldn’t go as far as to say inedible, but it could be something you just choke down as quick as possible, or it could actually be yummy.