It's widely known that the poorer you are, the more likely you are to be obese. The chart below jumps off of the obesity research of Adam Drewnowski who found that a single dollar could buy more calories of junk food rather than healthy food. He found that a dollar can get someone 1,200 calories of cookies or potato chips, but only 250 calories of carrots.
The Ration put 30 common supermarket items on a scatterplot and the results pretty much supported Drewnowski's findings. Explore the chart below to learn what foods are highest in calories, sodium and sugar but lowest in price.