The growth of the American food industry will always bump up against this troublesome biological fact: Try as we might, each of us can only eat about fifteen hundred pounds of food a year. Unlike many other products - CDs, say, or shoes - there's a natural limit to how much food we each can consume without exploding. What this means for the food industry is that its natural rate of growth is somewhere around 1 percent per year - 1 percent being the annual growth rate of American population. The problem is that [the industry] won't tolerate such an anemic rate of growth.

One of the skills of a journalist, though, is to find people who can teach him what he needs to know. So instead of taking courses, I've been very lucky in that I found teachers - scientists, especially - who were willing to teach me what I needed to know, whether it was about genetically modified crops or how photosynthesis works, and so on. I just find my teachers and don't have to pay for my education.

I mean, we're really making a quantum change in our relationship to the plant world with genetic modification.

People who snack sometimes sometimes eat kind of thoughtlessly and end up eating a lot more. But in principle, it's a really good idea if you can exert the kind of discipline needed.

The issue of snacking is complicated. In principle, "grazing" is probably a good idea. It would even out the insulin spikes and things like that from eating large meals. The problem is it makes it harder for people to control the amount they're eating.

At home I serve the kind of food I know the story behind.

One of the most irresponsible things we can do is eat in ignorance, without any awareness of what our eating is doing to the world or to other species.