Eating too much salt
Do you look exhausted no matter how much sleep you get? If you're plagued by persistent dark circles under the eyes, watch your sodium intake. In many cases, the discoloration appears when puffy eyelids and under-eye bags cast shadows on your face [source: Bailly]. Chances are you're retaining water thanks to last night's pizza or your morning side of bacon. In fact, a salt-heavy meal can make your entire face swell, just like it does to your fingers. Plus, iodized salt has been linked to breakouts, giving you another good reason to set aside the shaker [source: Jimenez].