I’ve heard multiple times that it’s not okay to allow any food to go down the drain even with a garbage disposal, I guess because solids shouldn’t go down the drain. But we put a shit ton of solids down the drain through the toilet and that seems to be fine. Does the toilet go to a different sewage pipe then the sink? Or does shit have different properties that make it dissolve better?
It depends on your plumbing. If your sink’s waste pipe is large enough, and has enough slope, and you put enough water down the drain to wash all the solids through the pipe, then you can certainly put food down the sink drain.
In my house the kitchen sink’s waste pipe is smaller than what the toilets use. And it makes a long, minimally-sloped run to the main sewer connection. That pipe will clog in a hurry if I put food down the kitchen sink drain.