The Top Food to Eat for Preventing Illness During Cold and Flu Season, According to Experts

When it comes to boosting immunity, most people think of the usual suspects—citrus fruits, leafy greens, and garlic. However, there’s another unsung hero in the produce section that can give your immune system a powerful boost: blueberries. These small, nutrient-packed berries are more than just a tasty snack or a topping for your morning yogurt. Full of antioxidants, vitamins, and essential nutrients, blueberries are a secret weapon in preventing illness.

"Blueberries are a delicious, easy-to-find, incredibly versatile fruit that’s great for boosting your immune system," says Susie Kundrat, RD. "Whether they’re fresh, frozen, dried, or juiced, blueberries pack numerous health benefits in every tiny berry." Here’s how this humble fruit can have a big impact on your overall health, helping you stay healthy and illness-free throughout the year.

Immunity-Boosting Benefits of Blueberries

Packed with Antioxidants

Antioxidants play a vital role in maintaining a healthy immune system by shielding your cells from harmful molecules that can weaken your immunity. This added layer of protection helps your body fight off infections and illnesses, keeping you strong throughout cold and flu season.

“Blueberries are loaded with antioxidants like anthocyanins, which are responsible for the deep purple hue of these berries," says Kundrat. "Antioxidants are often found in the vibrant colors of fruits, so fruits that are bright, dark, and colorful are excellent for boosting your immune system."

Anti-Inflammatory Benefits

Chronic inflammation can gradually weaken the immune system, making it harder to fend off illnesses. “Consuming blueberries can help support your immune system by reducing inflammation and assisting your body in managing oxidative stress,” suggests Kundrat.

Promotes Gut Health

Blueberries are naturally rich in fiber, which helps eliminate toxins and supports overall bowel health, according to Trista Best, RD. “Maintaining gut health is essential for preventing illness, as it aids digestion, protects the body, and keeps harmful pathogens at bay.”

Enhances Immune Cell Function

“Incorporating blueberries into your diet strengthens the effectiveness of immune-boosting cells—such as natural killer cells—in carrying out their functions,” says Kundrat. These cells are crucial to your immune system, as they identify and destroy infected cells that can make you unwell.

“This detoxifying effect contributes to overall health by preventing cellular damage that can lead to chronic conditions like cancer and obesity," says Best.

Packed with Vitamin C

Blueberries are loaded with vitamin C, a vital nutrient that bolsters immune health, aids in collagen production, and helps repair tissues throughout the body. “While the vitamin C content is well-known for supporting immune function, it also acts as an antioxidant to eliminate toxins from the body,” Best says. Just one cup of blueberries provides a significant portion of your daily vitamin C requirements, helping you prepare for the cold and flu season.

Ways to Incorporate More Blueberries into Your Diet

“I recommend incorporating blueberries into your daily routine—whether you add them to your overnight oats, toss a handful into a fresh salad, mix blueberry juice into your afternoon smoothie, or bake them into a delicious berry pie for dessert,” Kundrat suggests. “And don’t forget to enjoy them as a snack anytime for a burst of flavor.”

Here are some recipes that can help you add more blueberries to your daily meals:

• Nutty Superfood Breakfast Bites
• Berry Matcha Smoothie
• Summer Berry Trifle with Elderflower Cream
• Blueberry Sweet Corn Shortcake
• Lemon-Blueberry Cake

Other Fruits that Boost Immunity

• Oranges: Rich in vitamin C, oranges are a go-to option for preventing illness and supporting radiant, healthy skin.
• Strawberries: Packed with vitamin C and antioxidants, strawberries also contain manganese, a key mineral that supports immune function and shields against cellular damage.
• Elderberry: Elderberries are full of anthocyanins, which help promote gut health and reduce the risk of chronic conditions.
• Pomegranate: Brimming with antioxidants, pomegranates aid in reducing inflammation and boosting your body’s ability to fight infections.