Finally, science has revealed why my youngest sister is slimmer than me. Maybe it’s not that extra portion of dessert after all.
Oldest sisters often moan that their youngest counterparts have all the luck. Potentially, in this case they do.
One of the largest studies of its kind, led by a Kiwi academic, was conducted to reveal whether birth order played a factor in weight.
The findings: The oldest sister is 40 percent more likely to be obese than their second-born sister.
From data of 13,4000 pairs of sisters, Professor Cutfield found that first-born women were 29 per cent more likely to be overweight and 40 percent more likely to be obese than their second-born sister.
Men aren’t safe either with these findings supporting previous research that concluded the same results for brothers.
The researchers from the University of Auckland and Uppsala University in Sweden said they were unsure why older sisters were the heaviest.
As the size of families decrease, researchers believe this study might be explain the rising obesity.
A lot of parents are having no more than two children which means there is more firstborns than there were in the past.
Although not every first-born is going to be overweight, the researchers suggest this information can help people make wise choices about diet and exercise.