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Being a First Born May Put You at Higher Risk for Obesity

The Los Angeles Times reports on a new study published in Nature that has found that being a firstborn male may put you at greater risk of obesity. The study recruited men between the ages of 35 and 55 who were either first or second borns. Researchers observed that “the average weight for the older brothers was just over 200 pounds, while the younger brothers averaged 185 pounds” and that their BMIs also differed by about 2 points. Results also showed that first borns were also 33% less sensitive to insulin even when controlled for exercise and body fat. Experts suggest that one explanation may be that “a first pregnancy causes changes in certain arteries in the uterus…firstborns don’t get the benefit of these changes from the moment of conception, but second children do.”

Read it in the Los Angeles Times.

Read the study published in Nature.