To help your immune system fight off the common cold virus, you will want to stock up on foods and beverages that are known to contain antioxidants which can help defend your body and protect your cells from free radicals produced while you’re sick. Some examples of such foods are dark leafy greens such as kale and spinach, blueberries, cranberries, strawberries, blackberries, red grapes, watermelons, pomegranates, goji berries, oranges, carrots, mangoes, nuts, sunflower seeds, legumes, and bell peppers.