Food companies have sold convenience, which means less cooking, microwave meals, etc. Wives used to spend an hour or more making dinner, using "real food". Now, often as not, they just heat something up. I was a single parent, I certainly get it. I'd get home and the first job was to figure our dinner. We ate a lot of spaghetti.
My kids of course didn't like broccoli etc. so there was not much point in fixing it. I fixed green beans once fresh, they wouldn't eat them, but they'd eat canned green beans.
I used hamburger helper at times, I knew it had a lot of salt, but the kids would eat it. A single parent starts to value time and convenience and what kids will eat over better nutrition. The food companies oblige.
I still like spaghetti.