Eighty percent of your immune system is in its gut, so when it's healthy, we tend to be able to fight off infections faster and better. Focus on eating a diet rich in fruits, vegetables, whole grains, and healthy fats, found in foods such as nuts and olive oil. Eating these will provide nutrients such as vitamin C, zinc, and other antioxidants shown to fight infection. An easy way to consume it all? Make a delish juice or smoothie!