problems responding quickly to specific objects. 圣诞老人要想把工作做好，唯一的办法就是在12月24日晚上开夜车。而熬夜会引发不少严重的健康隐患。睡眠不足会产生累积效应，而圣诞老人又……
the only way for santa to get the job done is to stay up all night on december 24 — and that can lead to some serious health concerns. sleep loss has a cumulative effect， and santa has been working hard， likely cutting back on sleep， for the entire month preceding christmas. as people lose sleep， they have problems responding quickly to specific objects.
圣诞老人要想把工作做好，唯一的办法就是在12月24日晚上开夜车。而熬夜会引发不少严重的健康隐患。睡眠不足会产生累积效应，而圣诞老人又是个勤快人，他要在圣诞节前的一整个月都熬夜工作。如果人们缺少足够的睡眠就会导致对特定问题的反应速度减慢。
that heavy sack of presents
you should never carry something that weighs more than 10 percent of your body weight， especially when one shoulder is taking on most of the burden. in fact， doing so can cause back strains and sprains， muscle pulls， back spasms， difficulty walking and tingling and numbness down the arms and legs.
不要背超过自己体重10的重物，尤其不要单肩背。背重物会导致背部拉伤和扭伤，肌肉拉伤，背部痉挛，行走困难，感觉刺痛，四肢麻木。
excess weight
the health risks linked to obesity are well-known， including， among others， type 2 diabetes， coronary heart disease， stroke， hypertension， certain types of cancer and osteoarthritis. and belly fat， in particular， can cause serious health problems， especially among men. belly fat can increase risk for insulin resistance， high triglycerides， heart disease and metabolic syndrome， among other problems — most increased risk happens with a waist size over 40 inches.
肥胖的安全隐患众所周知，包括ii型糖尿病，冠心病，中风， 高血压，部分癌症和骨关节炎。腹部肥胖，尤其是男性，会引发严重的健康问题。腹部肥胖会增加胰岛素抵抗力下降的风险，引发高血脂，心脏病和代谢综合症。这些健康问题在腰围超过40英寸（2尺95，98厘米）的人中尤其多发。
a vitamin d deficiency
living with the short days in the north pole， not to mention working the night shift in december， can cause a serious deficiency of vitamin d， the sunshine vitamin， which has been linked to several health problems. santa should aim to take a supplement that provides 1，000 iu of the nutrient. in addition， he should consider increasing his consumption of vitamin d-rich foods， such as salmon or fortified milk.
圣诞老人住在日短夜长的北极，在12月还要加夜班，这就会使他严重缺乏维生素d。维生素d可以通过日晒获得，如果缺少维d，就会引起多种健康问题。因此，圣诞老人每天要多补充1000个国际单位的维生素d，还要多吃富含维d的食物，比如鲑鱼和强化奶。
shift work
santa’s not alone here， more than 8 million americans perform shift work， which has been linked with serious health problems， including cardiovascular disease， diabetes， ulcers and depression， among others.
圣诞老人并不是唯一需要倒班工作的人，在美国有超过800万人的工作都是倒班制。倒班工作会引发严重的健康疾病，包括心血管疾病，糖尿病，溃疡，抑郁等。