All it takes is choosing to be conscientious, then pick the path you like. The American Heart Association publishes a diet that I like. My daughter is a veggie, and is very healthy. My son does a diet he got from an athletic trainer, and is healthy as hell. Paleo diet folks seem pretty happy, and it's what Crossfit
recommends. Just pick something besides eating what America appears to want to serve you. Stick to the outside aisles at the supermarket, and try not to eat anything your great grandmother wouldn't recognize as food.