https://consumerist.com/2017/10/25/butter-is-so-popular-right-now-its-causing-a-croissant-shortage-in-france/

If you’re traveling to France in the near future and have dreams of picking apart the delicate, flaky layers of authentic croissant, be warned that these beloved pastries may be in short supply when you get there. Why? Apparently because people are eating more butter.

Reuters reports that the increased consumer demand for butter — coupled with a shortage in milk production — in France has resulted in butter prices doubling in just the past year.