[corobo]

I understand it's an absurd argument but children are sentient and has far more potential than a chicken by being allowed to live out their natural life.

If a child grows up and does nothing more than put together a single shoddy chicken coop that lets water in and falls over in a mild breeze it has infinitely out-performed the chicken. People with disabilities are still infinitely more capable than chickens, cows, most any animal we eat.

There's also the problem of disease transmission too if you really want to hash out the idea. Most diseases don't transfer between species (at least not in catastrophic ways), if we were eating other humans there would be a lot of new diseases we'd need to fight or die from. See also BSE [1] and CJD [2] as examples of problems that occur through cannibalism.

[1] Bovine spongiform encephalopathy https://en.wikipedia.org/wiki/Bovine_spongiform_encephalopat...

[2] Creutzfeldt–Jakob disease https://en.wikipedia.org/wiki/Creutzfeldt%E2%80%93Jakob_dise... - particularly the "Cannibalism" section of Transmission.