When it comes to eating animals, I feel that we should not make animals suffer, and we should provide for their needs. As for the sin of killing them, I feel that domesticated animals are only alive because we provided a way for them to live. They would not have a life were it not for our efforts. So what little life we give them is more than what they would have had.
More than 90% of the animals in the wild die at the hands of predators.
I am sure that there are health issues with eating too much of the wrong kind of meat, so we should avoid that.