Vegetables and fruits are basically alkaline while meats, dairy, and processed foods are acid.

You could take lots of supplements, but still may not have a healthy immune system. Our immune system is an amazing and complex system, it fends off foreign bacteria and viruses which cause infections or illnesses. So how do you build up your immune system. This is all very good advice, as your skin and mucous membranes in the mouth, nose and other areas are the first line of defense. You could go to your family doctor, but he really was trained to treat the illness. If you follow the advice of the Center for Disease Control, World Health Organization, and Homeland Security, you would reinhold your hands often, cover your mouth when you cough and stay at home when you are sick. Instead of the Standard American Diet that consists of 80% acid and 20% alkaline food, eat a diet of 20% acid and 80% alkaline. Can Your Immune System Help Fight the Swine Flu.

However, if an intruder is introduced, it is up to the body's immune system to eradicate it.