I dunno, ask the species of small deer that snuck up behind me within a few feet once at a beach camp ground hoping for a handout when they apparently recognized the sound of chip bags as I was packing up the car.

Or any dog that begs for it, for that matter. Or raccoons and bears that get into whatever they can.

One bite of that human stuff and you're hooked. lol

Also eating rats was a big no, no for Splinter throughout City At War. It took him being trapped, nearly starving to death and being emotionally tortured by the Rat King for him to do that so I highly doubt he encouraged his sons to do it.

That's a good point. Though while it would have been looked at as cannibalism for himself... maybe not so for his 4 hungry turtle wards?

C'mon man, you know after being mutated their metabolism had to have sped up closer to something like a mammal's, especially with how active they are. Simple insects just wouldn't cut it. Also explains how pizza could have became a dietary staple, as packed with calories as it is.