Hundreds of millions don’t get enough to eat, but billions get too much. Around four in 10 adults in the world are overweight. For most of human history the biggest battle was to get enough food to eat. Now, the hungry are a minority. The fact that obesity rates have increased so quickly across the world is actually a signal of how new and rare this situation is: evolving in a world of scarcity, we’ve been programmed to make the most of any food we can get our hands on.
