Our stress levels tend to skyrocket around holiday time. And the dark and gloomy weather doesn't help, either. So we often turn to fatty and sugary foods for comfort. But just as our food choices will make it hard to fit those skinny cords, what we eat can also impact our mood—for better and for worse. So Everything She Wants asked Theresa Creamer, a registered dietician at the Montefiore-Einstein Center for Cancer Care in New York City, for advice on how to beat the winter blahs with 5 nutrient-packed foods. Salmon: Fatty fish such as salmon, tuna, herring and sardines are rich in omega-3 fatty acids, which are thought to have a positive effect on mood swings and feelings of depression. They also help reduce inflammation and the risk of developing heart disease. Eggs: During the winter, we tend to hibernate and bundle up. So we make less vitamin D—“the sunshine vitamin”--because we have less exposure to the sun. That's...