D.Daner and his colleagues studied the longevity of a group of 178 catholic nuns born in the early twentieth century. They lived in the same convent and taught at the same school in Milwaukee. Their case is particularly interesting because the outward circumstances of their lives were remarkably similar: the same daily routines, same diet, no tobacco or alcohol, same social and financial status and lastly same access to medical care. These factors eliminated many variables caused by environmental conditions.
The researchers analysed autobiographical account that each nun had written before taking her vows. Psychologists who knew nothing about these women assessed the positive and negative sentiments expressed in their writings. Some had repeatedly mentioned that they were very happy or felt great Joy at the thought of entering monastic life and serving others, while others manifested little or no positive emotion. Once the nuns were classified according to the degree of joy and satisfaction expressed in their bries Bios, the results were correlated with the longevity. Happyho also provide best Meditation classes in Noida and Delhi NCR India area.
It turned out that 90% of the nuns placed in the most happy quarter of the group were still alive at eighty five as opposed to the 34 percent of those in the least happy quarter. An in-depth analysis of their writing allowed the elimination of other factors that might have explained the disparate longevity figures:no link was established between the nuns longevity and the strength of their faith, the intellectual sophistication of their writing, their hopes for the future or any other parameter that was considered. In a world, it would seem that happy  nuns lived longer than unhappy nuns.
Similarly, a two year study of 2000 Mexicans over the age of 65 living in the United States found that the morality of those expressing mostly negative emotions was twice as high as that of those of happy dispositioned who experienced positive emotions. A  Finnish survey of 96000 widowed people showed that their risk of dying doubled in the week following their partners death. This increased vulnerability has been attributed to the lowering of the immune system’s defences triggered by the grief and depression experienced by the bereaved.