Probiotics are good bacteria that strengthen the immune system and keeps bacteria that can make you sick in check. Some research shows probiotics may reduce respiratory infections. Your best sources include yogurt that contains live, active cultures, Buttermilk, soy milk, olives, sauerkraut, Kombucha Tea (fermented tea), Kefir, Miso soup (an Asian soup) and tempeh (a soy protein).
Liquids are key to keeping your body hydrated, which helps your immune system keep viruses at bay. If you drink juice, limit it to 4-6 ounces of 100 percent fruit juice per day so that you don’t get excessive calories and sugar. Also include black and green tea that contains many antioxidants. Water, which is pure, simple and inexpensive, is a must. Keep a cup or water bottle with you and drink it throughout the day. Squeeze in a lemon or lime wedge for an extra antioxidant boost.
Overall good nutrition is also important, so be sure to eat a variety of fruits and vegetables every day. There is scientific evidence that what you eat and drink can affect your immune system.