1. Spinach
Spinach is loaded with vitamins C and E, antioxidants, and beta carotene that will boost your immune system. Keep in mind that it is best to cook as little as possible in order to retain the nutrients.
2. Blueberries
Blueberries contain a flavonoid called anthocyanin, which is an antioxidant that helps improve the immune system. Based on research, it is concluded that those who ate foods with flavonoids were less likely to get an upper respiratory tract infection or common cold in comparison to people who did not consume foods with flavonoids.
3. Almonds
Almonds are a source of vitamin E, manganese, magnesium, and fiber. Vitamin E acts as an antioxidant and therefore helps the immune system.
4. Kale
Kale is said to be one of the healthiest foods in the world. Not only does its nutrients help with cardiovascular issues, but it also has so many nutrients that can keep you healthy by boosting the immune system.
5. Citrus fruits
Citrus fruits are rich in vitamin C, which promotes the production of white blood cells. White blood cells fight infections. Moreover, Vitamin C can help reduce the duration of the cold. This includes fruits such as oranges, lemons, grapefruits, etc.
6. Green tea
Green tea has the ability to increase the number of regular T cells that contribute to the immune system function.
7. Yogurt
Yogurt contains live cultures that function as a probiotic which helps the immune system. Probiotics are the good bacteria that help the digestive system.