A new study points out that firstborn women are 29 percent prone to be overweight, in comparison to their sisters. Moreover, women who were born first are also 40 percent inclined to be obese. So, the study claims that firstborn ladies were more likely to have weight problems during their lifetime, primarily during pregnancy.
Researchers from the University of Auckland had previously studied men’s weight-related issues, according to their birth order, whereas it seemed a similar association existed between sisters as well.
It seems that 206,510 firstborn women have been monitored as their mothers turned 18. When they became pregnant, firstborn future mothers developed a 2.4 percent higher body mass index (BMI) compared to their second-born siblings. Data from the Swedish Born Register was used, involving women born in between 1991-2009, whereas twins were not included in the study.
Moreover, the study analyzed firstborn ladies’ lifestyles, health condition and family history. This happened as scientists monitored them in their antenatal period. Their heights and weights had been recorded as well, as valid information was the core of the study.
However, the issue remained debatable, as this was an observational study and solid proof was yet to be found.
Research pointed out firstborn ladies wouldn’t gain weight from birth, but rather when they had conceived. The scientific team who looked into the issue said the placenta was involved, as the blood vessels were constricted, which affected the uterus. Researchers explained that the nutrient supply was reduced, which implied that fat and glucose levels were irregular, and this meant that the firstborn woman
“in later life […] is at risk of storing more fat and having insulin that works less effectively.”
President of the American College of Lifestyle Medicine, Dr. David Katz, reported that his team’s study proved that a correlation was established in between females’ birth order and the odds of them becoming obese during adulthood.
Moreover, first born sisters were at risk of developing illnesses like diabetes and conditions such as high blood pressure. The study also claimed that they were taller by approximately 1.2 millimeters than their siblings.
According to the study, both firstborn men and women worldwide would develop an increased body mass index due to the family size decline.
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