I have a generally optimistic temperament and am thrilled by what I see as a rapidly growing food movement, especially among young people who care about how food is produced and what it does to their health and the environment.

I am not a vegetarian. I subscribe to my own mantra: eat less, move more, eat plenty of fruits and vegetables, don't eat too much junk food, and enjoy what you eat. Or, to summarise: eat less, eat better, move more, and get political.

I follow my own advice: eat less, move more, eat lots of fruits, vegetables, and grains, and don't eat too much junk food. It leaves plenty of flexibility for eating an occasional junk food.

How we grow food has enormous effects on the environment - climate change as well as pollution of air, water, and soil.