Eating fruits in healthy amounts can help boost your immune system and many other benefits. If you are looking for ways to prevent flu, colds, and other infections, you must include fruits in your regular meal. Most fruits are low in sodium, calories, and fat; fruits are a great source of essential nutrients such as vitamin C, potassium, folate, and dietary fiber.
Best fruits for the immune system    
Here are the best fruits for the immune system.
Blueberries
Blueberries are the best fruits that boost immunity, containing a kind of flavonoids called anthocyanin, which shows antioxidants properties and can help boost the immune system. Flavonoids play a vital role in the immune protection system of the respiratory tract. One cup of blueberries has about 15 grams of carbohydrates and 4 grams of fiber. You also get 36% of the approved dose of vitamin K and 24% of your routine recommended vitamin C.
Citrus fruit
Many people immediately return to vitamin C after catching a cold. Because it helps boost your immune system. Vitamin C aggravates the production of white blood cells, which are the frontline of protection against fighting infections.
All citrus fruit is a high source of vitamin C. Some famous citrus fruits include
1.    Tangerines
2.    Lemons
3.    Oranges
4.    Grapefruits
5.    Clementines
6.    Limes
Papaya
Papaya is still another fruit that strengthens the immune system and contains vitamin C. In a single medium fruit, you can get about double the routine recommended amount of vitamin C. Papayas has a digestive immune system called papain that has anti-inflammatory effects. Papaya also has the actual amount of magnesium, folate, and potassium, supporting your overall well-being.
Kiwi
Kiwis are naturally packed with essential nutrients such as vitamin K, folate, vitamin C, and potassium. Vitamin C strengthens the production of white blood cells to fight against infections.
Pineapple
Pineapple is high in manganese and vitamin C and contains an enzyme called bromelain and is also high in manganese and vitamin C. Bromelain helps control diarrhea, absorb antibiotics and even fight heart disease cancer, and diabetes.
Watermelon
Watermelon helps you stay hydrated and strengthen many other health benefits, such as assisting with muscles soreness, regulating the immune system, and lowering blood pressure. Watermelon contains vitamin C, potassium, copper, vitamin A, and B5.
Apples
Apples are sweet, cheap, healthy, and readily obtainable. They help boost the immunity system and reduce your weight, which can help defend against several diseases linked to obesity. Apples flesh and peels contain polyphenols and antioxidants that can help lower the risk of heart disease and strokes by significantly boosting immunity.
Grapefruit
Grapefruit is full of vitamin C and a small amount of vitamin A, manganese, folate, protein, magnesium, and thiamine. They may lower the risk of cancer. Grapefruit also contains flavones that show anti-inflammatory properties.
Avocado
Avocado contains an essential amount of potassium, iron, and vitamin E and is rich in monounsaturated fat, promoting a healthy immune system and lowering cholesterol.
Pomegranate
Pomegranates contain two unique compounds: punicic acid and punicalagin, which may help fight cancer. Pomegranate also lowers blood pressure, fights inflammation, and lowers the risk of heart disease.
@Maddys FoodFun @Healthy blog.. By steef @Healthy Qi 

Best fruits for the immune system