There was a big media splash for this story about how some researchers had looked at depictions of the Last Supper and found that depictions of portion sizes of the food had increased. Some of the reports seemed to take the approach that this wasn't surprising, that as food scarcity decreased that would be reflected in art. Some took a more annoying and superficial approach (pretty much any article that included the phrase "super sized" would fit into this group). But here (found via Making Light) is a look at the article that shoots down the whole idea. Thesis fail. Research fail. Methodology fail.