Maybe I should give the documentary a watch. Thanks for sharing @Kirn . Personally I think that as long as animals have enough space to move around relatively freely, and they're healthy, then I don't see any problems. I know that some (if not most) of the meat I eat, even over here, does not fit what I mentioned before, but then again considering the overpopulation of our world, then it's not like we have a lot of better options.
I don't think cutting out meat from our diet is going to benefit us in the long run. If we move over to the topic of what's a healthy diet for people then there are some ground rules, but it's also clear that for example one person reacts differently to eating rice than another person. There's still too much we don't know about our diets and how our diets affect us.