People generally believe that happiness can increase health, is conducive to longevity, while unhappy is the direct cause of poor health, but recently researchers have found that after the survey of more than 300 people living conditions, happy or not happy does not mean that the risk of death will become lower or higher, accordingly they pointed out that the disease could lead to unhappiness, But unhappiness itself is not detrimental to health.
A person with a low risk of death does not mean good health, and a high risk of death does not mean bad health would challenge the researchers' argument.