From the Consumerist:
This is also why you're fat. A graph of inflation-adjusted data from the Bureau of Labor Statistics shows how the prices of different food and beverages has changed over the past three decades. The price of crap food over the past 30 years has dropped. At the same time, the food you used to try to hide in your glass of milk has gotten steadily more expensive.
Obviously Coke is better for you than oranges—we’re all rational actors, aren’t we?