【晨讀美文四級篇】做一個樂觀者（3/3）

Many studies suggest that the pessimist's feeling of helplessness undermines the body's natural defenses, the immune system. Research has found that the pessimist doesn't take good care of himself. Feeling passive and unable to dodge life's blows,he expects ill health and other misfortunes, no matter what he does. He munches on junk food, avoids exercise, ignores the doctor, has another drink. Most people are a mix of optimism and pessimism, but are inclined in one direction or the other. It is a pattern of thinking learned at our mothers' knees. It grows out of thousands of cautions or encouragements, negative statements or positive ones .Too many" don'ts" and warning of danger can make a child feel incompetent, fearful and pessimistic. Pessimism is a hard habit to break, but it can be done.