- Youths who lived in counties with expensive calories were less obese than those who lived in counties with inexpensive calories. This applied to both calories associated with foods purchased to be consumed at home and calories purchased at fast-food restaurants (McDonald's, Pizza Hut and KFC, to be precise).
- Obesity was lower in counties with inexpensive prices of fruits and vegetables than in those where fruits and vegetables were more expensive.
Over the centuries, falling food prices have proven to be a blessing, freeing much of the world's population from the most fundamental concerns about subsistence. This may no longer be true as our society adopts more sedentary lifestyles. Expect to see more discussion of calorie taxes in the future, along with exercise credits.