"It’s not surprising that with supply decreasing and demand increasing, most people find it difficult to avoid gaining weight with age."

"The demand for calories increases with age, both because one’s income rises and because one’s taste for good, caloric food has been developed over many years of good eating. I didn’t know what an Esterhazy cake was 40 years ago, but now I can’t resist one if it’s on the menu! Sadly, however, the ......"

Link: http://www.freakonomics.com/2011/04/01/obesonomics/