During cold and flu season, do you find yourself shirking from your coughing co-worker or avoiding the sneezer behind you in the checkout line? Are you the one who’s constantly washing their hands, then slathering on hand sanitizer? Staying healthy is hard this time of year, and it doesn’t help that illnesses can last longer and be more intense. So it’s understandable that you’d try every measure to avoid getting sick.

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If you don’t want to mess around with your immune health, and instead focus on making your immune system as strong as you can, follow these tips. Stay healthy, naturally.

1. Add more citrus into your diet.
Citrus fruits, high in vitamin C, help your body produce those antibodies it needs to ward off illnesses. But, citrus isn’t the only source of high vitamin C levels you can obtain through food. Try chili peppers, kale and kiwis!

2. Get more sleep.
It’s easier said than done, what with our busy lives and the need for some relaxation time before bed, but sleep does wonders for the body. Skimping on sleep increasing the amount of cortisol in your body, which is known to suppress healthy immune function. If you feel a cold coming on, or if you’ve been exposed to someone that has a particularly bad case of the flu, make sure to prioritize your sleep and get quality shuteye.

3. Get out in the sun.
Temperatures continue to drop as we progress through flu season, but even when wrapped in layers, you can still reap the benefits from immune-boosting vitamin D. As always, remember to practice sun safety tips, especially if you plan to play outside in the freshly fallen snow.

4. Wash your hands.
This would normally go without saying, except that the U.S. Department of Agriculture recently found that 97% of the time hand washing is performed incorrectly. Always wash your hands with hot water for 20 seconds, then dry completely with paper towels.

It is possible to work for your immune system and prevent some illness with basic updates to your diet and lifestyle. Support your immune system this flu season so you can stay at your optimal health.