By Kris Gunnars
People are fatter and sicker than ever before.
Obesity rates have tripled since 1980 and have increased particularly fast in children.
The reason why this has happened is still debated among scientists, but it must be due to changes in the environment because our genes don’t change this quickly.
This article contains graphs with historical trends and results from obesity studies, showing some of the main reasons why obesity has become such a massive problem.
Here are 12 graphs that show why people get fat.