Kathy Freston

I missed a tuna-fish sandwich with mayo on toasted wheat bread more than anything. Six months after I went vegan, I snuck into a deli and took one home. And, of course, it wasn't nearly as good as I fantasized. It tasted, well, fishy.

Whole foods like grains and beans release their sugar very, very slowly because of the fiber in them, and they don't give you a sugar rush. They feed your cells as needed, and as a result, you have loads of stable energy that powers you through the day.

If I had a magic wand, I would live in a building in New York, big enough so my friends, my family could all have apartments in it. We'd raise our kids in the same space and have backyard barbecues and get old and fat together.