No joke: Laughter may really be the best medicine. Medical experts have found that laughing and an active sense of humor can stimulate your heart, lungs and muscles; lower blood pressure; improve the immune system and even help protect you against a heart attack:

A study by cardiologists at the University of Maryland Medical Center concluded that laughter and an active sense of humor can help protect you against a heart attack. It found that people with heart disease were 40 percent less likely to laugh than people of the same age without heart disease.

Researchers at the University of California-Los Angeles and other medical institutions that are part of Rx Laughter, a project to measure the effect of entertainment on trauma patients, found that children undergoing a medical procedure had less anxiety and handled pain better "when they watched a funny, enjoyable, engaging film or television show."

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If you’re a smoker you may want to start drinking green tea. A new study has shown that drinking a cup or more a day could decrease the risk of developing lung cancer. Scientists say the antioxidants in the tea may inhibit tumor growth:

Drinking a cup or more a day of green tea may counteract the effect of smoking on lung cancer, especially in smokers who may not be genetically susceptible to the cancer, according to a Taiwanese researcher.

''The antioxidants may inhibit tumor growth," I-Hsin Lin, a master's degree student at Chung Shan Medical University in Taiwan, tells WebMD. She presented her findings today at the American Association of Cancer Research -- International Association for the Study of Lung Cancer meeting in Coronado, Calif.

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New research shows that telling your boss what you really think of them is good for you! It allows you to let off steam and reduce stress that could cause anxiety, depression or even raised blood pressure. Also, the feedback could help your boss to improve their management style:

Employees benefit as it allows them to let off steam, said expert Emma Donaldson-Feilder, presenting the research at a conference in Brighton:

"The consequences of stress are pervasive; those under stress may experience psychological symptoms, such as anxiety or depression, physiological symptoms, such as palpitations or raised blood pressure and/or cognitive symptoms such as reduced mental capacity."

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