Some microorganisms living in the human body are probiotic (helpful) while others are not. It is a healthy immune system that helps the body fight against the microorganisms that are not healthy. For many people, it is the immune system response that helps prevent infection and ensures that they are healthy. However, for some people, a compromised, impaired or weakened immune system causes a low or weak immune response, thereby increasing their chances of infection or chronic diseases. Some of the weak immune system causes are an overdose of sugar, consuming excessive alcohol, food allergens, lack of sleep, and Obesity. A healthy immune system can also be damaged by certain medication, dehydration, exposure to radiation, an unhealthy lifestyle, inactivity, and stress. A healthy immune system can be maintained by following tips such as eating the right foods and following a proper diet. Some of the best foods to improve the immune system naturally include the following.

Blueberries:
The strong anti-oxidants that are present in the pigments and flesh of these berries help improve the immune system. These anti-oxidants also boost your nerve response, mental acuity, colon health, and macular degeneration.

Pistachios

Fish Oil:
Fish oil contains omega 6 and omega 3 fatty acids that are essential for boosting the immune system. Fish oil can be obtained by consuming fish such as salmon, taking cod liver oil supplements, or by cooking with fish oil. Vitamin E oil which is found in fish such as salmon has strong anti-antioxidant properties.

Figs:
Figs contain essential nutrients such as manganese and potassium in addition to antioxidants that help improve the immune system. Figs can be consumed fresh or you can opt for the dry fruit variety.

Pistachios:
Pistachios are extremely rich in anti-oxidants and are considered to be an important food that helps increase your immunity. It is recommended that you eat these nuts at least thrice a week.

Ginger:
The anti-bacterial properties of ginger can be used in the cure of infections such as stomach ailments, running nose, and sore throat. Regularly drinking ginger tea is one of the best natural immune system boosters that provide protection against colds, flu, or sore throats.

Kiwi:
The phytonutrients present in kiwi help protect the DNA that is present in the human cell's nucleus. Kiwi is also packed with vitamin C that helps neutralize free radicals that are responsible for cancer formation or inflammation.

Pomegranate:
This fruit features among the top immunity boosting foods. Its anti-microbial properties help kill disease causing bacteria such as E Coli. The antioxidants present in pomegranate are effective enough to shrink existing tumors and also help fight inflammations.

Raw carrots:
The beta carotene present in carrots helps strengthen the immune system. Cooking the carrots destroys the beta carotene and it is best you eat them raw.