Oscillo Contest Healthy Habits #3: Eat a healthy diet rich in vitamins C and E. Foods containing these vitamins are believed to be helpful in supporting the immune system. Foods rich in vitamin E include sunflower and corn oils, sunflower seeds as well as nuts like almonds and peanuts. You can get your daily dose of vitamin C from foods like oranges, strawberries, broccoli and peppers. Additionally, make an effort to reduce your intake of refined sugars (e.g. soda, candy) because excessive sugar consumption impairs the immune response.