6. Not smiling
It may sound cheesy, but a frown can cause more than just wrinkles. Researchers don’t know why, but it seems that when people are in a good mood, they simply have more determination.
Translation: If you know you’re going to require discipline at a certain time of the day—to cook a healthy dinner, hit a Pilates class, go for a jog—then make sure you can tap into something that makes you smile to help you follow through with your goal. Bookmark a funny YouTube video, re-read a funny email, or just play an upbeat song on your iPod.