Yeah, there's a lotta truth in that one.

The Happiness Project: Happiness Myth No. 5: A “Treat” Will Cheer You Up.:

"Hapiness Myth No. 5: A “Treat” Will Cheer You Up. Often, not!

It depends on what you choose. Treating yourself to a long walk in the park, say, is a good idea – but the things we choose as “treats” frequently aren’t good for us. When you’re feeling blue or overwhelmed, it’s tempting to try to pick yourself up by indulging in a guilty pleasure, but unfortunately, the pleasure lasts a minute, and then feelings of guilt, loss of control, and other negative consequences just deepen the blues."