Every day we are exposed to millions of germs. Oftentimes we neglect to wash our hands before preparing food or when near someone who has a cold or cough. These are times when we become exposed to bacteria and viruses that can make us sick, but most of the time we don't become ill and can fight off illness because of our incredible immune system.

Cancer is a disease that manages to defeat the immune systems of some people. The body's immune system is a very complicated system made up of many different kinds of cells. Your immune system is a network of cells, tissues, and organs that has a job to defend you against infectious invasions or bacteria. Even though we possess this amazingly designed immune system, sometimes things go wrong and we still get sick.

Most cancer risk factors are lifestyle related or come from our environment, and therefore cancer is a preventable disease. More than 30% of all cancer is preventable by avoiding risk factors such as smoking, obesity, low fruit and vegetable intake, physical inactivity, alcohol, sexually transmitted infection, and air pollution.

Good nutrition is necessary to build up the immune system while poor nutrition tends to cripple the immune system. Researchers believe that eating large amounts of protein such as found in animal products can contribute to a weakened immune system. Fresh fruits, vegetables, grains, mushrooms, freshwater fish such as salmon and mackerel tend to increase the production of antibodies that protect the body. Paying attention to good nutrition is important and sensible.

For a long time researchers have observed the positive effects of exercise on the immune system. On the other hand, it is well known that high levels of stress suppress the immune system and reduce the body's ability to defend or repair itself. Meditation, relaxation techniques, and yoga along with other exercises are believed to strengthen the immune system.