Some of the reason for obesity might be fast food but some of it is just rising incomes along with unique cultural things. For example, in the Philippines, you

Some of the reason for obesity might be fast food but some of it is just rising incomes along with unique cultural things. For example, in the Philippines, you look healthy if you are chubby and people show concern if you are skinny. People encourage you to eat until you feel full. The food is generally fattening, but poor Filipino's can only afford enough that they won't get fat. Much of the fattening dishes are reserved for special events. Back in the day, a bottle of coke was a special thing. Now people can afford to keep the fridge always stocked. ETA: Fast food restaurants are relatively high-end. Even then, the food is relatively expensive. I see a lot of Filipino's ordering drinks and then sharing the biggest order of fries on the menu.