A new study reveals that siblings may have something to do with your weight gain!

A report published in the Journal of Epidemiology & Community Health reveals that first-born sisters often put on more weight than younger ones.

The research – which studied 13,000 pairs of sisters over 20 years – found that older sisters are 40% more likely to be obese and 29% more likely to be overweight than their younger sisters.

They also had higher BMIs when they were pregnant, and have a higher risk of diseases such as diabetes and high blood pressure.

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The study – which was conducted by researchers from Sweden and New Zealand – doesn’t elaborate on exactly why this happens.

Research has previously been conducted on first and second-born males which produced similar findings.

Professor Wayne Cutfield from the University of Auckland believes that the blood supply to the placenta during a woman’s first pregnancy is less, and that a lack of nutrients as a result could lead to a greater risk of fat storage and less effective insulin regulation later in life.

Not convinced tbh! I am the youngest and my sister is much smaller than me.

Is this true for your family?

Share your comments below

  • I don’t have a sister but I have a younger brother. Can I blame him for my weight struggles all my life? haha


  • Great news :( Not! I am the first born girl. To be honest, I don’t think there’s too much between us Weight wise


  • your weight is up to you, no one else..


  • If his theory was correct wouldn’t this also be true for brothers and mixed gendered families. I think they need to do more research to work out what’s going on.


  • I have a brother, can I blame him?..lol


  • I don’t know about all these ‘studies’.


  • Is your sibling also to blame for a lower weight ?


  • true but then we swapped and I am now the bigger sister


  • Oddly, this is true for me family. I would be interested to know more about this.


  • Not the study… but my siblings constantly telling me I was fat didn’t help. It made me think I was, even though I now look at photos and realise that I wasn’t.


  • Well this is an interesting study. I don’t think I’m convinced and it wouldn’t hold true for my family.


  • I don’t know if I believe this study.


  • My older sister is about 20kg lighter than me. But I’m a taller and a bigger frame than her – she’s tiny.


  • I’m the oldest and even though I’m not fat, my sisters got blessed with having the perfect bod!


  • I’m the middle child and also the biggest.


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