In fact India does have a lot of obesity. The rates are not yet as high as they are in the US because they are even more oppressed by poverty, meaning that 1. even inexpensive food is in limited supply, and 2. many Indians still rely on manual labor which keeps obesity rates down.

It is noteworthy that India has a massive problem with diabetes and also has the lowest life expectancy in the world.

It seems it has more to do with the "empty calories" that are in processed foods. Sugar (in its many names: corn syrup, etc.) is put in everything, even in things that do not need it such as bread and yogurt. I would be in favor of taxing producers that put sugar in everything just to get people hooked. It's immoral and corrupt to say the least.

Not to mention that of the "blue-zones", the most long-lived populations in the world, none are following a carnivore diet.