The body is very picky about what kind of tissue it will accept as-its-own, entirely different level of quality required. Our digestive system is not at all as

The body is very picky about what kind of tissue it will accept as-its-own, entirely different level of quality required. Our digestive system is not at all as sensitive. We will probably get to lab-grown organs (it is actively researched), but creating artifical meat for eating is easier to do first.