Get between 7 and 9 hours of sleep nightly. This will improve your ability to fight off viral infections, such as the common cold, says Robert McLean, M.D., a rheumatologist at Yale New Haven Hospital and president of the American College of Physicians.
Increase your intake of nutrient-dense foods. These include fatty fish (sardines and salmon), which provide vitamin D, key for immune-system function, says Julie Stefanski, a registered dietitian nutritionist and spokesperson for the Academy of Nutrition and Dietetics.
Rehab your diet with superfoods. These include dark leafy greens, raspberries and blackberries, and citrus and broccoli, all good sources of vitamin C, which supports the immune system and healing. Pumpkin and sweet potatoes provide vitamin A for a strong immune system. And foods such as olive oil, chia seeds, and avocado provide vital nutrients that help to fight infection.
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