Everything from lack of sleep and a poor diet to chronic rubbing from allergies, to loss of fat or thinning of skin caused by sun exposure and aging can contribute to the puffiness and dark circles that make your eyes look and feel more ghoulish than human. If sufficient beauty sleep won’t help, try watching what you eat. Salty foods and alcohol cause water retention, resulting in puffy, baggy eyes. If you have allergies, take an antihistamine to minimize your allergic reaction, and the itching, rubbing and redness that come with it.