Why is grassfed better?
You’ll want to check out this primer by Mark’s Daily Apple where he talks about the living condition and nutrition required for a large animal like a cow.
You see, cows are ruminants, meaning that they re-chew their food by regurgitating it from one of their four stomach. These animals have high energy requirements and complex social lives that suffer when you put them in a big lot plant.
These cows are stressed and depressed, in addition to drugged, making their meat toxic for human consumption.
Meanwhile, grassfed beef is leaner and more full of good fats because the animal is processing a diet it has evolved to eat. No cow should have to eat corn. But farmers prefer it because of it’s rich carbohydrate load, one which can even be refined into ethanol.