There have been poor people throughout the history of time, why is it that obesity rates have been going up? Shouldn't they stay the same, or decrease, as more

There have been poor people throughout the history of time, why is it that obesity rates have been going up? Shouldn't they stay the same, or decrease, as more people move away from the have not, to the have something? Spent a month in India, tons of poor people, very few fat ones. The majority of overweight people were the affluent, that just didn't care, because they were well fed, and had essentially slaves working for them to do all of the hard physical work.