I've edited my comment to reflect the fact that I'm only speculating about specific food items making the poor fat. But make no mistake, the poor are fat - their average BMI is 29, only one point short of obesity. If you ever live in a poor neighborhood, all you need to do is open your eyes to see that everyone has plenty to eat.
Maybe something like that is the case here?
Early on during the recession, NPR, an American radio station did a report on people going hungry as a result of the recesssion. Go look at the picture. http://www.npr.org/templates/story/story.php?storyId=9259254...
No starving person in Africa or anywhere else had a BMI of 29.