I have spent much of my adulthood overweight, often obese and fruitlessly following all sorts of diet programs. Last year, however, I decided to try a new approach. I purposely didn’t apply the latest in nutritional science. (Over the years, many experts have told me that we still don’t have enough data to know definitively which diets work best.) Instead, I used economics to pick a diet that would work best for me. More specifically, I used the game theory that economists applied during the cold war.