I think if you shop on the edges of the grocery store, keeping away from those foods in the middle, it results in a balanced diet.
God created us and God created the foods for us to eat, they match. Everything man does to change the food interferes with how our bodies are made to digest food. With our population growth, we have to use preserving methods to feed us all, but each one damages the food. Real, unprocessed milk is illegal, oil refinery is unbelievable when God's way is to press, chickens never go near the ground, grains are made into sugary cornflakes, even.
On the edges of our groceries are the least processed foods.