Because we [north american] eat way too much of it. Once a day is too much.
I could produce you studies concluding to this fact. Or send you to youtube to watch horrible videos of animal being butchered. I could start explain you how the meat industries ruins slam farmers.... But most of you already know all of that.
I didn't take lots of pictures, because I had a 2yr old playing in tomato sauce...
But here's how we do our pizza now:
250g (1 cup + 1 tablespoon) warm water
17 g active yeast
500 g (3 1/3 cup) Flour
2 table spoon salt
Around 50 ml olive oil
Blue together for 3min. Than add Green.
You let the dough double (takes about 1h) and knead it for 10 min
1 can of tomato paste
Some water (to reach the consistency you want)