There are four basic ways to change the food system. I talk about three of them a lot: The first is to eat differently, focusing on good food and especially plants; the second is to bring change to your work, whether that means becoming a farmer or helping other people eat better through your role as a teacher, doctor, artist, techie, lawyer or journalist. The third is to work locally to effect change in, for example, school systems or municipal politics.
The fourth is the toughest: Change the system that governs everything, including food. This means changing dominant economic theories and practices, and indeed the nature of capitalism itself. That isn’t happening anytime soon.