There are plenty of natural ways to help you boost your immune system and stay healthy all year long: 1. Focus on Vitamin D. Did you know that most people have low vitamin D levels? Even dangerously low, within a range that could severely limit your immune system. 2. Eat More Garlic. Garlic is one of the most potent of all superfoods that goes back thousands of years for treatment of illness. 3. Get Your Probiotics. 70% of your immune system lies in your gut flora and the health of the friendly organisms in there to protect you against pathogens and sickness. 4. Avoid ALL processed foods and sweetened soft drinks. This is no time to bombard your body with processed foods, fried foods, high-fructose corn syrup, refined sugars or chemical additives.