If you're a girl then you know that having a younger sister is a lot of fun even though she keeps borrowing clothes from your wardrobe. But would you believe she can influence your life in a much more serious way? Researchers from Sweden and New Zeland teamed up to find out if there is any connection between the birth order and weight. Their results turned out to be quite surprising!

According to the study, at birth first-born women actually weighed less than their siblings, but when they grew up they were 29% more likely to be overweight and 40% more likely to be obese in comparison with their second-born sisters. So you'd better put away that bag of chips if you have a younger sister!

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