Study: Firstborn women greater risk for obesity than younger sister

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HOUSTON -- Can birth order affect obesity? Some researchers from Sweden and New Zealand think so. And you might, too, when you hear about their recent study. It gives a new meaning to the phrase, 'big sister!'

The pair of researchers just completed a study comparing sisters` weights, and published their findings in the Journal of Epidemiology & Community Health. They found firstborn sisters were 29 percent more likely to be overweight and 40 percent more likely to be obese than their younger sister.

In fact, their findings support something called the 'resource dilution hypothesis.' Which means....as families grow in size, apparently, parents have less food...less money....and less attention to go around. That can affect kids` physical and mental growth.

This might make sense....but it is just a study, not an actual experiment. No one can say for sure whether being the older sister means you will be the more full-figured one. And that`s the fat truth!