Enjoy Your Menopause!

May 4, 2009

A Baby Can Add Years to Your Life

Filed under: Uncategorized — Beverly Mahone @ 5:52 pm

Women who have babies naturally in their 40s or 50s tend to live longer than other women. Now, a new study shows their brothers also live longer.   

In a study involving participants from Utah and Quebec, it was learned that brothers who had at least three sisters, including at least one sister who gave birth at age 45 or later, were 20 percent to 22 percent less likely to die during any year after age 50 than brothers who had no “late fertile” sisters.

The study didn’t address how much longevity is due to genetics, but scientists believe genes account for up to 25 percent of differences in longevity. “The new thing here is what most evolutionary biologists long have argued: that survival and reproduction are intrinsically linked to one another.

 
Late Babies Linked to Longer Life for Moms and Blood Uncles

— The study confirmed earlier research showing that women who have babies late tend to live longer.

By looking at the brothers of women who had children late, the study suggests the same age-slowing genes may be responsible for both prolonged fertility in women and longer lifespan in both sexes. The effects of late fertility were strongest for brothers with at least three sisters because the larger the number of sisters, the more likely it is at least one will give birth in middle age.

In the Utah group, brothers with three or more sisters – at least one of whom gave birth at age 45 or older – were 20 percent less likely to die during any given year after age 50 than men without late-fertile sisters.

In Quebec, brothers with three or more sisters – at least one of whom gave birth at age 44½ or older – were almost 23 percent less likely to die during any single year after age 50 than men without sisters who gave birth late.

It is possible social and environmental reasons – good water, good nutrition, a healthy environment – could explain why the brothers and their late-birthing sisters had longer lives. So the researchers also examined the longevity of the brothers’ wives.

They found no increase in lifespan, indicating that heredity – far more than environmental factors played a role in the prolonged fertility and longer lives of the women, and the longer lives of their brothers.

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1 Comment »

  1. Very interesting data.

    Comment by Karen O'Bannon — May 13, 2009 @ 2:43 am | Reply


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