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It is a scientific fact that if you go through life in a negative frame of mind, always stressed out, worried and full of fear, your immune system will waken, making you more susceptible to sickness and disease. Scientists have discovered that every person develops cancerous cells in his or her body every week. But in the tremendous immune system God has given us, we have cells called the natural killer cells. These cells are designed specifically to attack and destroy abnormal cells. Studies have shown that fear, worry, anxiety, stress and other negative emotions actually weaken those natural killer cells. In other words, if you go through life uptight and stressed out, you will weaken your own immune system, making yourself more susceptible to sickness and disease.
On the other hand, people who are happy and have a positive outlook, people who laugh on a regular basis, develop more of these natural killer cells than the average person. Think of it. When you stay full of joy, your immune system functions at its peak performance level, just as God intended. A cheerful mind works healing and that Scripture continues to be confirmed by modern science.