研究人员们从5岁开始对约1000名儿童进行了追踪研究。当孩子们处于5岁、7岁、9岁和11岁时，研究人员询问这些孩子的父母，他们是否会咬指甲或嘬手指。约三分之一的儿童有至少其中一种习惯。

When the kids were 13 and then 32 years old, the researchers performed allergy tests. Sure enough, the group that had habitually bit their nails and/or sucked their thumb as kids were less likely to have developed allergies.

当这些孩子长到13岁和32岁时，研究人员对他们进行过敏测试。结果发现有咬指甲或（和）嘬手指习惯的孩子，更不容易过敏。

At the same time, one of the study authors advised parents not to encourage nail-biting or thumb-sucking in their kids.

与此同时，该论文作者建议父母们不要鼓励孩子们咬指甲或者嘬手指。

While nail-biting doesn't typically cause long-term damage, it can damage the skin around the nail, making you more susceptible to infections. Meanwhile, if thumb-sucking continues past when a kid's permanent teeth come in, it can change how the teeth line up.

虽然咬指甲不会造成长期损伤，但会破坏指甲周围的皮肤，让人更容易感染。此外，在换牙之前嘬手指会影响牙齿的排列。

3. Running late

迟到

Being chronically tardy can interfere with both your personal and professional relationships, making you look disorganized or worse, disrespectful.

【有这10个“坏习惯”，那可能是因为你聪明！】相关文章：

★ 你对生活是否满意 取决于你怎么花钱！

★ 口味变了？流行歌曲变得更加愤怒和悲伤

★ 如何对 “放弃” 说不！

★ 抑郁症是一种什么体验？

★ 2100年的人类什么样？弯腰驼背 手肘弯曲

★ 拥有这8个特点的人都很有魅力

★ 菲利普亲王上交驾驶证！只因不系保险带？

★ 长得不好看？可能是因为你的名字没取好

★ 地球未来很“凄惨”？100万个物种正遭受灭绝威胁

★ 颈椎累了就扭一扭?千万别,可能丧命