One of my pet peeves is when people compare the United States, generally unfavorably, with small genetically homogeneous countries. So this post at InsideHook by Tanner Garrity got off on the wrong foot with me. In the article Mr. Garrity writes glowingly of locavorism as a solution to the U. S.’s obesity problem. Here’s the kernel of his post:
The TL;DR version: diets suck. They lead to more abusive eating and make people feel like failures. They’re completely unsustainable, and produce a ping-pong match between days spent with processed crap and days spent with empty stomachs.
There’s exactly one diet that is worth your time and effort, though. While diets typically function as domineering rule books (don’t eat this, don’t eat that much of this, etc.), the “100-mile diet†isn’t in the business of forbidding particular foods. Instead, it encourages consumers to reconsider the sources of those foods, and prioritize ingredients that can be found down the road. The idea is to limit one’s participation in the supersized supply chain, and eat more naturally, similar to communities in famous “Blue Zones†like Sardinia, Ikaria or Okinawa, where families cook the fresh food that’s available to them, live longer, and (surprise, surprise) never seem to experiment with diets.
That’s good enough. Let’s focus on Sardinia.
Sardinia is an island in the Mediterranean, part of Italy, that is roughly the size of Vermont with about three times Vermont’s population. Nowhere in Sardinia is more than about 50km from the sea. About 3% of its population is other than native Sardinian. It is genetically very homogeneous. It has been isolated from the rest of Europe for thousands of years. The median household income is about that of Puerto Rico—lower than in Mississippi. Trying to compare the United States with Sardinia is fatuous.
I think that Mr. Garrity should consider a different explanation for the health of the Sardinians: over time they have adapted to their environment. It’s not the other way around which is what he seems to assume.
Here’s a map showing Chicago and a circle illustrating the 100 mile radius.

I’m quite confident in claiming that what’s grown and caught within 100 miles of Chicago wouldn’t feed the people of Chicago proper let alone all of the people of the area. That’s true of ever major city in the U. S., especially those in the South and West. Consequently, my prediction of what would happen if a 100 mile diet were forced on people would be that
- 90% of the people would starve.
- Those who survived would change the pattern of agriculture as well as their diets.
- They would not be materially healthier than before the Great Diet Change.
What would they be eating? Mostly corn and soybeans as far as I can tell.
Mr. Garrity seems to understand that on a primal level since he launches into a lengthy digression on vertical farming. I think that what he’s proposing is a sort of “underpants gnome” scheme—romantic fantasizing with not practical path to accomplishing his dream.
All of the preceding notwithstanding, we are fatter than we were 50 years ago. You can demonstrate that to yourself by comparing a yearbook picture from 50 years ago and one taken recently. What should be done? If I had a simple, workable answer to that I’d be a gazillionaire. I think we need to
- Change how much we eat.
- Change what we eat.
- Get more exercise.
I think that many of us are not well-adapted not just to the diet that we are eating but to the diet that we can eat. I think there’s a mismatch among genetics, behavior, and life expectancy.






