I haven't noticed any additional food intake between the times when I commute and when I do not. I save about $10 a day in bus fares, so it took me about 6 months to pay back the expense of my new bike and since then it's just pure profit. Plus it's just so enjoyable on the bike - I'd say it's worth like $20 per day for the joy I get when I ride my bike. So it's like someone pays me a couple of grand a year. AND then there's the nice girls I usually meet now and then, so that's worth something too.