Breastfeeding mommies, are you equally concerned with what your babe eats once they no longer have breastmilk?

I've been watching tons of food and health conscious stuff like the movie Food, Inc. and Jaime olivers food revolution. They've inspired me to research into matters further about what we eat, what's done to our food ect. I'm just disgusted. Here I was thinking that if i go to the store and buy lean chicken and fruits and veggies that I'm doing a good job, but with all the chemicals, pesticides, hormones, antibiodics, ect......it's not natural at all!! That got me thinking about breastfeeding mothers who judge formula mothers (of course not everyone does it). Are you equally concerned? Are you making the steps to eat natural? Obviously natural would be better for our children.