You cited poverty as a reason but then switched to income inequality as the statistic.

When citing poverty, simply look at poverty rates, not a different statistic. Income inequality is higher in countries with higher incomes, like the United States.

Regardless, obesity is not limited to people in poverty.

Absolutely. The American way of life traps people in a zoo. There is nothing to do other than work (if you are lucky), eat, and consume junk media. For ones who are poor the only difference is the degree to which the food is also junk.

... and that "bad" food in the US is frequently cheaper and easier to find than "good" food.