On the one hand, our social nature is our greatest beauty - it means that we have natural empathy and sympathy. But our social nature also means that we may let ourselves be controlled by the judgments of others, precisely because we care so much about our status in community.

In the late 1960s, there were alarming predictions that worldwide famine was around the corner. I wondered if humans had already lost the race, overrun the Earth's capacity. I let one question lead to the next, and unearthed information that would forever change my life: Not only is there enough food in the world to feed every man, woman, and child on Earth, there is enough to make us all chubby.

Humans need to feel effective - to feel that we can "make a dent," as he puts it. So the art of living is to find expressions appropriate to our own uniqueness in which we can experience effectiveness.

I understand, of course, that grain-fed meat is not the cause of the world hunger problem - and eating some of it doesn't directly take food out of the mouths of starving people - but it is, to me, a symbol and a symptom of the basic irrationality of a food system that's divorced from human needs. Therefore, using less meat can be an important way to take responsibility. Making conscious choices about what we eat, based on what the earth can sustain and what our bodies need, can help remind us that our whole society must begin to balance sustainable production with human need.

We didn't evolve to be passive victims or shoppers.

A life-long mission has been to counter the notion that political engagement is the spinach we must eat in order to have the dessert of freedom.

You have increasing poverty and increasing wealth. Fine food is one way to dispense with a lot of money... It's understanding that our daily choices about food connect us to a worldwide economic system. And that economic system - not scarcity - creates worldwide hunger for millions of people.