Energetic, happy and relaxed people are less likely to catch colds than depressed, nervous, and irritable people. When the brain is "relaxed and happy," it sends signals to various organs that help keep it healthy. Maintaining a healthy mood can effectively reduce the likelihood of colds, pneumonia and even cancer. In addition, people who are relaxed and happy tend to have better health habits than people with negative stress. They were more likely to get enough sleep, exercise regularly, and have lower levels of certain stress hormones in their bodies.
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