[kqr2]

It's also interesting to consider this calculation from a carbon emission perspective. From Climate impacts of biking vs. driving :

http://www.keith.seas.harvard.edu/blog/climate-impacts-of-bi...

If you eat a lot of meat and bike, you could potentially have a bigger carbon footprint than a very fuel efficient vehicle.

[adt2bt]

That's what I hoped this article was about when I saw the headline. I was disappointed it was only about the $ cost of food and not the externalities.

Thanks for sharing. It's interesting to see though that a biking paleo dieter is still 2x as efficient from a passenger-mile standpoint as a roughly average 25 mpg vehicle, and the average US diet is still better than a double occupancy Prius.

[dllthomas]

... assuming the biking does not displace other exercise.

[galdosdi]

This is a really important point. For many people, bike commuting is partly a way to avoid having to schedule an extra hour a day dedicated solely for exercise, so the calories are indeed "free"