This article describes some of what they do with lab primates for obesity: https://www.nytimes.com/2011/02/20/health/20monkey.html https://www.nytimes.com/2011/

This article describes some of what they do with lab primates for obesity: https://www.nytimes.com/2011/02/20/health/20monkey.html https://www.nytimes.com/2011/02/20/health/20monkey.html Essentially: put them in small cages for years, give them a nearly unlimited supply of food, and give them nothing to do. Terrible.