For a long time humans did not breed animals for the sake of eating them, they used to hunt (just like a lion). No one was guilt-tripping anyone in those days (I hope), as we had to survive (not thrive).
The situation has changed completely in the modern world. We have created meat factories, forcefully torturing millions of animals daily, and have somehow agreed upon what animals to kill and not to kill.
A lion will kill anything that moves (as long as it is not poisonous), are you willing to kill (and eat) any animal under the sky?
What about pets? Do you think they suffer any kind of pain and suffering ? If yes, that's the same way any other animal you eat (regardless of intelligence) feels when being slaughtered.
One more question to think about:
A young child (in a modern urban world) will be more comfortable plucking and eating fruits from a tree ?
OR
killing a pig -> draining blood -> cutting it into pieces -> cooking it to eat it ?