*Certain community characteristics may affect life expectancyAn international team of scientists studying lifespans of wild mammals have found that, just like humans, females tend to live significantly longer than their male counterparts.
Prof. Tamás Székely, from the Milner Centre for Evolution at the University of Bath, was one of the authors of the study. He said: ‘We’ve known for a long time that women generally live longer than men, but were surprised to find that the differences in lifespan between the sexes were even more pronounced in wild mammals than in humans.
“Another possible explanation for the sex difference is that female survival increases when males provide some or all of the parental care. This is also true in birds. Giving birth and caring for young becomes a significant health cost for females and so this cost is reduced if both parents work together to bring up their offspring.”
Meanwhile, in a new study, higher daily step counts were associated with lower mortality risk from all causes. The research team, which included investigators from the National Cancer Institute and the National Institute on Ageing , both parts of the National Institutes of Health, as well as from the Centers for Disease Control and Prevention , also found that the number of steps a person takes each day, but not the intensity of stepping, had a strong association with mortality.
In analyses by subgroups of participants, the authors found that higher step counts were associated with lower all-cause death rates among both men and women; among both younger and older adults; and among white, black, and Mexican-American adults. In secondary outcomes of the study, higher step counts were also associated with lower rates of death from cardiovascular disease and cancer.
“Being physically active has many benefits, including reducing a person’s risk of obesity, heart disease, type 2 diabetes, and some cancers. And on a daily basis, it can help people feel better and sleep better,” said Janet Fulton, Ph.D., of CDC’s Division of Nutrition, Physical Activity, and Obesity.
If predictions are accurate, the U.S. will drop 21 spots in global life expectancy rankings from its current position of 43rd to 64th, meaning there will be a relative decline in life expectancy.
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