The results revealed big differences between each twin. While the more active twins had lower body fat percentage (20.7 versus 24), better endurance levels, and normal insulin sensitivity, the sedentary twins had about seven more pounds of body fat, worse endurance, and insulin sensitivity that showed signs of early metabolic disease. Not only were their bodies different; their brains diverged as well. The athletic twins had more gray matter (the information processing part of the brain), particularly in areas that controlled balance and motor function.

结果揭露了每对双胞胎之间巨大的差异。常运动的双胞胎拥有更低的体脂肪率（20.7:24），更好的耐力，和正常的胰岛素敏感度，少运动的双胞胎脂肪多出7磅多，耐力差，胰岛素敏感度更显示出早期代谢病的症状。不仅身体状况不同，他们的大脑也出现差异。运动双胞胎拥有更多脑灰质（大脑中负责信息处理的部分），尤其是负责平衡和运动功能的部分。

The study was small, but the takeaway is clear: Quitting your fitness routine can trigger body and brain changes that mess with your cardio fitness and strength and set you up for chronic conditions such as di abetes, says Jordan Metzl, M.D., sports medicine physician and author of The Exercise Cure. (Metzl was no t part of the study.) And considering that the less active twins in the study had only recently become co uch potatoes, these changes can sneak up on you a lot sooner than you'd think. "Muscles begin to atroph> after just a few days of being sedentary," says Metzl. "Organ damage and changes in overall functioning w ill follow."

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