Scientists have figured out how a woman’s age affects the health and the lives of her grandchildren
At the end of the last century in evolutionary anthropology even appeared so-called “grandmother hypothesis” according to which menopause occurred to women were not distracted by their new babies, and had the opportunity to care for grandchildren.
Two new studies published in the journal Current Biology, suggest possible evidence of this hypothesis. Analysis of the duration of life of the people of the communities of the XVII-XIX centuries, have shown that the younger was the grandmother, the more chances you have of her grandchildren to survive in early childhood.
A team of scientists from the University of Turku in Finland found records of Finnish congregation, born 1731 in 1895. The experts noted the following dependence: if the maternal grandmother, who lived close to their families, was 50 to 75 years, then their grandchildren, ages 2 to 5 were 30 percent more likely to survive than children without grandparents in the maternal line.
Interestingly, the presence of grandparents on the paternal side at the age of 75 years and older, by contrast, increased the probability of infant death up to 2 years by 37% in comparison with the child not having grandparents on the paternal side.
David Koll, a biological anthropologist from the Australian Edith Cowan University, who was not involved in the study, suggests that the decline in survival of children with elderly grandparents on the paternal side was caused by a conflict between young parents who had to simultaneously care for and about young children and their elderly parents.
In addition, the researchers found that the presence of grandparents, who lived far from their offspring, has had such a positive influence on their grandchildren. Using information about 3382 the maternal grandmother and 56 767 grandchildren, living somewhere between 1608 and 1799 in the region of the canadian St. Lawrence valley, the team found that increasing the distance between mothers and daughters, the latter had fewer children.
Medical anthropologist from the University of Delaware in Newark Melissa Melby believes that these studies shed light on the lives of communities in North America and Europe in the 1600’s and 1700 years, but their progress is not enough to provide strong evidence in favor of the “grandmother hypothesis”.
We will remind, it became known as body proportions affect the longevity
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