Well, our sewage company requests us not to put anything into the toilet except what they politely call no. 1 and no. 2 plus toilet paper.
They are not particularly thrilled when we pour soup, milk, etc. down the kitchen sink either.
Any foodstuffs disposed of into the drains do tend to clog the sewage works' filters.
Personally, I compost the very little food wastage we have. I find it perfectly possible either not to cook larger quantities than I know we will eat in one or at the most two meals, or to freeze the surplus portions,
With rising food prices, plus the rising price of whatever source of energy we use for cooking, I think we all have to try very hard not to make more food that we know we can eat.