To a very great extent, it's the fast-food industry that really industrialized our agriculture - that drove the system to one variety of chicken grown very quickly in confinement, to the feedlot system for beef, to giant monocultures to grow potatoes. All of those thing flow from the desire of fast-food companies for a perfectly consistent product.
The astounding variety of foods on offer in the modern supermarket obscures the fact that the actual number of species in the modern diet is shrinking. For reasons of economics, the food industry prefers to tease its myriad processed offerings from a tiny group of plant species, corn and soybeans chief among them.
A cow out on grass is just an incredible thing to behold... Cows and other ruminants can do things we just can't do. They have the most highly evolved digestive organ on the planet, called the rumen. And the rumen can digest grass. It takes grass, cellulose in grass, and turns it into protein, very nutritious protein. We can't do that.
Simply by starting to cook again, you declare your independence from the culture of fast food. As soon as you cook, you start thinking about ingredients. You start thinking about plants and animals and not the microwave. And you will find that your diet, just by that one simple act, that is greatly improved.