身材匀称的儿童才会保持健康

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Physically1 fit kids stay physically

healthy

Kids who are less physically active and have excess2 body fat have more sick days, new research reports.

Eating right and getting exercise affect more than just kids' waistlines3. Scientists found that fifth graders who were physically fit and spent more time participating in sports activities reported fewer days of cold or flu symptoms4 than inactive kids did. In contrast,kids who had more than 25 percent body fat reported more sick days than kids carrying around less extra fat.

During the study, scientists asked 29 boys and 32 girls between the ages of 10 and 11 how often they exercised, tested their body fat, and gave them logs5 to record how many days per month they spent with cold and flu symptoms. Children also completed running tests to measure their physical fitness. Exercise may keep kids healthy by providing a constant source of moderate6 stress,strengthening their bodysystemsandenablingthemtoward offbacteria7 and viruses. If youdon'tchallengethesystems,theygetsloppy8.

Excess body fat, may weaken the body because fat requires resources that get diverted9 from the body's infection fighting machinery. Parents try to encourage kids to be active every day, eat a healthy diet, and lose weight if they are obese.

一项新的研究报告称，那些缺乏运动，体内脂肪过多的儿童，生病的时间也更多。

对于孩子们来说，正确的饮食和参加运动并不仅仅是帮助他们避免发胖这么简单。科学家发现，在上5年级的孩子们当中，那些身材匀称，运动时间更多的学生，患感冒或出现流感症状的天数比那些不爱运动的孩子们少。那些体内脂肪含量超过标准值25％的孩子较之脂肪少的孩子们，其生病的时间更多。

在研究过程中，科学家调查了年龄为10岁到11岁的29名男孩和 32名女孩的运动频率，并为他们检测了身体脂肪含量，给他们日志记录下每月他们各有多少天会出现感冒和流感症状。同时，孩子们还进行了用于检查身体状况的跑步测试。运动能够产生一种持续的、适当的压力，使孩子们身体健康，增强体质，从而驱除细菌和病毒。如果你不经常刺激一下你的身体系统，它就会变得脆弱。

过多的脂肪会使身体愈发虚弱，因为原本用于抵抗身体感染的机制，由于脂肪消耗能量而转移。父母应鼓励孩子每天运动，吃健康的食品，如果发胖就要减肥。

注释：

1．physically adv．身体上

2．excess adj．过量的，过多的

3．waistline n．腰围

4．symptomn．[医]症状

5．logn．(一般活动的)工作记录薄

6．moderateadj．适度的，有节制的

7．bacteria[复]n．细菌

8．sloppy adj[口]脆弱的

9．divertvi．转向，转移