WELLINGTON, Feb. 10 (Xinhua) -- First-born children are more inclined to become overweight adults than their younger siblings, according to a New Zealand study published Monday. Researchers at the University of Auckland studied 50 overweight, but otherwise healthy men between the ages of 35 and 55. They found that first-borns were on average 6.9 kg heavier than second-borns and had a greater body mass index (BMI), while insulin sensitivity was also 33 percent lower in first-born men. Both BMI...
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