Oysters

It also assists your immune system with tasks such as healing wounds.

Watermelon

it's also got plenty of an antioxidant called glutathione. It strengthens the immune system so it can fight infection.

Wheat Germ

It's the part of a wheat seed that feeds a baby wheat plant, and it's rich in nutrients. It's a great way to get zinc, antioxidants, and B vitamins.

Low-Fat Yogurt

Also look for added vitamin D. Studies show that people with low vitamin D levels may be more likely to get colds or the flu.

Acai Berry

There isn't any research that shows acai is good for any specific condition. But in general, antioxidants from foods are a key part of a healthy lifestyle.

Button Mushrooms

If you're low on selenium, you may be more likely to get a more severe flu. Riboflavin and niacin play a role in a healthy immune system.

Elderberry

berries appears to block flu viruses. But scientists caution that more study is needed. You definitely still need to get a yearly flu vaccination!

Spinach

It also boasts fiber, antioxidants such as vitamin C, and more. Eat spinach raw or lightly cooked to get the most benefit.

Tea

These antioxidants seek out cell-damaging free radicals and destroy them. Caffeinated and decaf work equally well.

Sweet Potato

In your body that turns into vitamin A, which mops up damaging free radicals. This helps bolster the immune system and may even improve the aging process.