"The upside -- if there is an upside -- to having a highly concentrated food economy where a very small number of corporations exert tremendous power is that when they move, everything changes," he said. He pointed to McDonald's decision, following years of complaints from customers and animal rights groups, to stop tolerating inhumane livestock slaughter. "The way the whole industry slaughtered animals changed overnight," he said. "You don't have to love McDonald's to see that engaging with them might actually produce some positive results."

Of course, the downside -- and there is a downside -- to engaging in conversations with representatives of powerful corporations is that they will spend the bulk of the time telling you what their company is doing right. And later, if they do make changes based on external pressure, they'll frame it as if they've simply discovered a new way to be right.

via Is Walmart allergic to Pollan?.