7 superfoods experts swear by to keep colds and flu away this winter

As cold and flu season settles in, keeping your immune system strong becomes more than just a good idea, it becomes a daily priority. Nutrition experts say one of the easiest ways to support your immunity is through the foods you eat. From leafy greens to green tea, certain ingredients offer powerful benefits that can help your body stay prepared. And the best part? These foods are simple to add to everyday meals.

ALSO READ: Widespread power outages affecting thousands in Wyoming and South Dakota- here's the latest update

With sniffles and seasonal bugs lingering well into winter, and sometimes early spring, many people are looking for simple, sustainable ways to support their immune systems. One of the most effective strategies, experts say, is paying attention to what you eat every day. The right foods can fuel the cells that protect your body, and adding immune-boosting ingredients is much easier than most people think.


For many, nutrition becomes the first line of defense. And according to health experts, incorporating certain whole foods can help strengthen your natural protection while making meals more colorful, flavorful, and satisfying. From leafy greens to probiotic-rich dishes, these seven superfoods are the ones nutritionists turn to most during cold and flu season.

ALSO READ: Mixing these 5 common foods with Diabetes meds could be a big mistake, experts say avoid these

Why does nutrition play such a big role in immunity?

If your goal is to keep your immune system functioning at its best, your diet is a smart place to start. Nutrition plays a major role in how effectively the body can protect itself from harmful germs. Immune cells rely on specific nutrients to trigger essential reactions, generate energy, and neutralize damaging molecules. As Gary E. Deng, MD, PhD, director of the Integrative Oncology Program at UCI Health, explains, immune cells “require certain nutrients to function properly.” These nutrients provide critical support behind the scenes, ensuring the body can respond when needed.

ALSO READ: 5 whole grains dietitians swear by to improve Insulin resistance and balance blood sugar


Researchers have long known that vitamins, minerals, antioxidants, fiber, and beneficial bacteria all influence how strong your immune defenses are. And according to the Academy of Nutrition and Dietetics, the ideal diet for immune health mirrors familiar, long-standing nutrition advice: eat plenty of whole plant foods, choose lean proteins, and include probiotic-rich ingredients that support a healthy gut, as per a report by Real Simple.

Just as important as what you should eat is what you should cut back on. Experts note that ultra-processed and heavily refined foods often lack the vitamins and antioxidants your immune system depends on. In fact, these foods can create inflammation and oxidative stress, forcing the body to divert its resources away from immune protection. As registered dietitian Rhyan Geiger, RDN, explains, these foods may cause the body to use up its “supply of antioxidants to fight those processes,” leaving fewer defenses for genuine threats. It doesn’t mean you can never enjoy treats like French fries or ice cream, it simply means they shouldn’t dominate your daily meals.

ALSO READ: Essential tips to prevent fatty liver: Foods to avoid and lifestyle changes for better liver health



Of course, food is just one part of the larger immune-health picture. Managing stress, getting seven to eight hours of sleep, and staying physically active all support the body as well. Nutrition, however, remains a foundational piece that you can strengthen every single day, as per a report by Real Simple.

Which everyday foods strengthen the immune system?

When you want to support your immune system through your meals, these seven expert-recommended foods deliver powerful benefits.

1. Leafy Greens
Leafy greens like kale, spinach, Swiss chard, and arugula offer some of the most concentrated immune-supporting nutrients of any food group. “Leafy greens are rich in micronutrients, especially vitamin C and vitamin K, which [are essential for promoting] a healthy immune system,” Geiger says. They’re also packed with beta-carotene and folate, two nutrients that further support immune function, as per a report by Real Simple.

Eating at least two cups a day is a simple goal to aim for. And greens can be added to far more than salads: blend them into smoothies, stir them into soups and stews, toss them into pasta, or layer them in grain bowls.

2. Probiotic Foods
Foods containing probiotics — such as yogurt, kefir, kimchi, sauerkraut, tempeh, and naturally fermented pickles — are essential for gut health, which is deeply connected to immunity. The “good” bacteria in these foods help strengthen the immune cells lining the intestines. Dr. Deng explains that these microbes even help metabolize foods to create nutrients “that otherwise wouldn’t be available to the body.”

ALSO READ: Stop guessing! Dietitians agree this is the healthiest cooking oil on the planet

Experts recommend incorporating probiotic foods two to three times per week. Whether you prefer starting your morning with Greek yogurt, adding sauerkraut to tacos, or enjoying kimchi with rice, these foods can be easily woven into your meals, as per a report by Real Simple.

3. Citrus Fruits
Citrus fruits like oranges and grapefruit are packed with vitamin C, one of the most well-known immune-supporting nutrients. Vitamin C promotes the production of white blood cells, which help defend the body from germs. Geiger suggests adding citrus slices to water, tossing them into salads, or blending them into smoothies for a refreshing, nutrient-rich boost.

4. Berries
Strawberries, blueberries, and raspberries are loaded with antioxidants that protect healthy cells from damage. According to Dr. Deng, berries provide vitamin C and fiber as well — both essential for immune function and gut health. Aim for two half-cup servings per week. Enjoy them in oatmeal, smoothies, baked dishes, or simply grab a handful straight from the fridge, as per a report by Real Simple.

5. Lean Protein
Protein doesn’t always get as much attention in immune-health conversations, but it plays a major role. “Protein [helps] the body repair tissues and muscle, build antibodies, and promote the synthesis of amino acids needed for immune function,” Geiger says. Lean protein sources — such as tofu, beans, lentils, skinless chicken, turkey, and white-fleshed fish like tilapia, offer the benefits without the saturated fat associated with red meat, as per a report by Real Simple.

6. Sweet Potatoes
Sweet potatoes are rich in beta carotene, which the body converts into vitamin A. This vitamin supports vision, regulates immune responses, and may have anti-inflammatory effects. One medium sweet potato provides more than the daily recommended intake of vitamin A. Baking one for dinner is an easy, comforting way to add this nutrient to your routine, as per a report by Real Simple.

7. Green Tea
Green tea is a soothing, antioxidant-rich drink that supports immune health. Geiger explains that it contains “a variety of antioxidants, including [a] plant compound called epigallocatechin gallate.” This compound may reduce inflammation and support overall immune function. Enjoy it hot, iced, or blended into smoothies.

How can you add more immune-boosting ingredients to meals?

The best part of these seven superfoods is how easy they are to incorporate. Add leafy greens to your eggs, toss berries into breakfast bowls, pair lunches with yogurt or fermented vegetables, choose lean proteins for dinner, and unwind in the evening with a warm cup of green tea. Each small choice adds up, strengthening your body’s natural defenses throughout the cold and flu season and beyond, as per a report by Real Simple.

FAQs

Which foods best support immunity?
Experts recommend leafy greens, berries, probiotic foods, citrus fruits, lean protein, sweet potatoes, and green tea.

Why does nutrition matter for immune health?
Immune cells need nutrients like vitamins, antioxidants, fiber, and probiotics to function properly.