The data comes from Massive Health’s iPhone app, Eatery, which had users snap 7.68 million pictures of everything they ate over the course of five months. The crowd-sourced data looks to be a reliable snapshot of how people eat: Their data on food consumption for each American city, for example, predict its obesity level. Individual users’ habits lined up with scientific research. They saw that those who eat breakfast tend to eat smaller portion sizes throughout the day, just as many previous studies have found.
In Massive Health’s global rankings, New York came in as the healthiest eaters in the United States. Click through for the full graphic, which shows how cities around the world - including Tokyo, Copenhagen and Sao Paulo - stack up.