流眼泪能排出毒素？假的！经常流泪对眼睛有害
人民网>>社会>>人民网“求真”栏目人民网“求真”栏目流眼泪能排出毒素？假的！经常流泪对眼睛有害
2018年04月04日10:08 来源：人民网
当我们眼中落入异物或者伤心难过的时候会流出眼泪。网上有说法称：流眼泪可以排出人体内的毒素。这是真的吗？央视“是真的吗”栏目记者咨询了医生。
首都医科大学附属北京同仁医院主任医师王海燕表示，“眼泪的主要功能是输送代谢的产物，比如说氧、二氧化碳等，和一般意义上说的排出毒素、排出有害物质不是一个概念。”
北京中医药大学第三附属医院副主任医师吴鲁华指出，“目前临床实验数据证明，眼泪并没有排毒作用。眼泪的作用可分为以下4种：首先，眼泪可以润滑眼表，保持眼睛舒适；其次，眼泪可以清除眼表的病原微生物，使眼表保持健康的环境；再者，眼泪可以为眼角膜提供一些营养物质和氧气；最后，眼泪可以为清晰的视力提供一个有强大作用的屈光界面。”
原来的眼泪的主要作用是输送代谢物，提供营养。但是人流眼泪有多种原因，有开心的泪、悲伤的泪、也有恐惧的泪，那么在不同情况下流出的眼泪成分都相同吗？是否会对健康产生影响呢？
王海燕表示:“人在伤心时流出的眼泪，和高兴时喜极而泣或切洋葱时反射刺激流泪成分是一样的，并不会因为伤心流出的眼泪就含有毒素或者别的特殊化学物质。另一方面，哭是缓解情绪的一种方式，就像跑步、咆哮一声或大吃一顿的作用一样，能达到疏肝解郁，缓解精神压力的目的，它只是一种宣泄的方式。眼泪是哭的一种代谢产物，本身并没有毒素成分，所以人们所说的情绪眼泪应该是带引号的。”
另外，专家指出，流眼泪非但不能排毒，经常流泪还会对身体产生危害。
吴鲁华称：“经常流泪会增加泪腺的负担，引起眼部干涩甚至视物模糊，所以经常流泪对眼睛是非常有害的。临床上经常会碰到一些患者由于抑郁或情绪问题经常流泪，导致眼部病变。尤其是女性，在产褥期如果经常流眼泪，会导致眼部气血不足，长久如此会引起眼部干涩酸胀、疼痛等不适症状。”
由此看来，眼泪是我们眼部代谢不可或缺的一个物质，对我们人体来讲非常重要。那么，当眼睛出现什么样的状况是需要引起我们注意的呢？
王海燕表示：“平时常见症状一种是干眼，即泪液少。出现这种情况，应该到医院去检查干眼到什么程度，由什么原因引起，然后针对不同的原因和程度，有不同的治疗方式。还有一种是泪道堵塞，就是泪液排不出去，平时总感觉眼泪汪汪的。出现这种情况，也应该到医院检查泪道，看看堵塞的原因以及是否存在发炎，再做相应的处理。预防干眼，首先，要避免长时间吹空调，减少泪液的挥发；其次，要避免长时间盯电脑，然后可以适量的眨眼睛，使泪液能够均匀的涂布于眼表；还可以适量的做眼部的热敷，改善睑板腺的功能，减少眼泪的蒸发。最重要的是要经常休息眼睛，多做一些眼睛保健操改善眼部的循环，增加眼睛的血供，这对我们舒适眼睛，保健眼睛会有很好的作用。”
除此之外，专家还告诉我们，在日常生活中一定要注意用眼卫生，在饮食上，多吃含有维生素C的水果对角膜上皮和泪液营养吸收有促进作用。如果感到眼睛不适，应立即去医院就诊，寻求医生帮忙。（孝金波 王亚静整理）
往期精彩:
用花椒水泡脚能祛寒湿？专家：因人而异吃鱼眼能明目？专家：鱼眼太小营养有限 应合理搭配膳食“红豆杉泡水能防癌”系谣言 多食小心中毒压力过大睡觉易被“鬼压床”？专家释疑
(责编：王亚静(实习)、孝金波)
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「心理專家研究發現，人悲傷時掉出眼淚中，蛋白質含量很高。這種蛋白質是由於精神壓抑而產生的有害物質，壓抑物質積聚於體內，對健康不利。」真相是什麼？
人的淚腺隨時都在分泌眼淚，眼淚可以滋潤角膜，潤滑眼球。不過如果受到了刺激，比如被洋蔥熏到眼睛，或者被男朋友放了鴿子，淚腺分泌眼淚的速度就會大大地增加。如果眼眶容納不下，眼淚就會流出來。
不同原因產生的眼淚成分是否不同？網上流傳了一則新聞說，因為悲傷而產生的眼淚中含有對身體有毒的化學物質，所以如果強行忍住眼淚對身體不利。
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', '', '', ].join(''); var price = 0.01 * bid.bid_price_cents; bauc({ size: p.sizes[0], ad: ad, adid: bidId, price: price, bidder: 'fan', pb: pm(price), }); } catch (err) { console.error('Failed to parse bp_1 response: ' + r); } } function bp_2(p, r) { try { var br = JSON.parse(r); if (!br.seatbid || br.seatbid.length === 0) { return; } var cur = br.cur; var seatbid = br.seatbid; for (var sbi in seatbid) { if (!seatbid[sbi].bid) continue; var bids = seatbid[sbi].bid; for (var bi in bids) { var bid = bids[bi]; var price = 0.01 * bid.price; bauc({ size: { width: bid.w, height: bid.h, }, ad: bid.adm, adid: bid.impid, price: price, bidder: 'ix', pb: pm(price), }); } } } catch (err) { console.log(err); } } function bp_1_5() { var p = {"placement_id":"544720725938753_641132752964216","sizes":[{"width":300,"height":250}],"testmode":false}; var format = p.sizes[0].width + 'x' + p.sizes[0].height; var testmode = (p.testmode === true) ? 'true' : 'false'; var url = 'https://an.facebook.com/v2/placementbid.json?placementids[]=' + p.placement_id + '&adformats[]=' + format + '&testmode=' + testmode + '&pageurl=' + encodeURIComponent('https://www.chinatimes.com/hottopic/20160731001583-260804') + '&sdk[]=6.0.web&adapterver=1.3.0&platform=241394079772386&platver=2.17.0' + '&cb=1254389297-bp_1_5'; hg( url, function (r) { bp_1(p, r); }, function () { console.log('Failed to bid bp_1_5'); } ); } function bp_2_6() { try { var p = {"site_id":"386215","bid_floor":0.2,"bid_floor_cur":"USD"}; var _w = 300; var _h = 250; if (p.sizes) { _w = p.sizes[0].width; _h = p.sizes[0].height; } var r = { id: '1254389297-bp_2_6', imp: [{ id: '1254389297-bp_2_6', banner: { w: _w, h: _h, topframe: 0, }, ext: { siteID: p.site_id, sid: (_w + 'x' + _h), }, }], site: { page: 'https://www.chinatimes.com/hottopic/20160731001583-260804', }, ext: { source: 'prebid', }, }; if (p.bid_floor !== undefined && p.bid_floor_cur !== undefined) { r.imp[0].bidfloor = p.bid_floor; r.imp[0].bidfloorcur = p.bid_floor_cur; } var referrer = gr(); if (referrer) r.site.ref = referrer; var _t = ''; if (p.bidding_timeout !== undefined) { _t = ('&t=' + p.bidding_timeout); } var url = 'https://as-sec.casalemedia.com/cygnus?' + 's=' + p.site_id + _t + '&v=7.2' + '&r=' + encodeURIComponent(JSON.stringify(r)) + '&ac=j' + '&sd=1'; hg( url, function (r) { bp_2(p, r); }, function () { console.log('Failed to bid bp_2_6'); } ); } catch (err) {} } var bs = [bp_1_5,bp_2_6]; for (var b in bs) { try { bs[b](); } catch (e) { console.error(e); } } })(window, in2wKey5); googletag.pubads().definePassback('/81206261/Chinatimes_AMP/Chinatimes_AMP_MiddleBanner',[[1,1],[300,250]]).updateTargetingFromMap(null).setTargeting('in2w_key', in2wKey).setTargeting('in2w_key2', in2wKey2).setTargeting('in2w_key3', in2wKey3).setTargeting('in2w_key4', in2wKey4).setTargeting('in2w_key5', in2wKey5).setTargeting('in2w_key6', in2wKey6).setTargeting('in2w_key7', in2wKey7).setTargeting('in2w_key8', in2wKey8).setTargeting('in2w_key9', in2wKey9).set('page_url', 'https://www.chinatimes.com/hottopic/20160731001583-260804').display(); {"transport": {"beacon": true, "xhrpost": false},"requests": {"ampeos": "https://pagead2.googlesyndication.com/pcs/activeview?xai=AKAOjsthqHFPNpZMD7p_EnLkGIX1UqSL7swbY6EzpIsnqsXdD_npqoU-e0czHzr9LYbtdG78twjcDBJuLHwDkQ5cXZ0hIsTYgI_wfDKJNkcs0q0&sig=Cg0ArKJSzHi2oinJ9KMBEAE&id=ampeos&o=${elementX},${elementY}&d=${elementWidth},${elementHeight}&ss=${screenWidth},${screenHeight}&bs=${viewportWidth},${viewportHeight}&mcvt=${maxContinuousVisibleTime}&mtos=0,0,${maxContinuousVisibleTime},${maxContinuousVisibleTime},${maxContinuousVisibleTime}&tos=0,0,${totalVisibleTime},0,0&tfs=${firstSeenTime}&tls=${lastSeenTime}&g=${minVisiblePercentage}&h=${maxVisiblePercentage}&pt=${pageLoadTime}&tt=${totalTime}&rpt=${navTiming(navigationStart,loadEventStart)}&rst=${navTiming(navigationStart)}&r=de&isd=${initialScrollDepth}&msd=${maxScrollDepth}"},"triggers": {"endOfSession": {"on": "visible","request": "ampeos","visibilitySpec": {"reportWhen": "documentExit","selector": ":root","visiblePercentageMin": 50}}}}
網上流傳了一則新聞說，因為悲傷而產生的眼淚中含有對身體有毒的化學物質，所以如果強行忍住眼淚對身體不利。(圖片取自果殼網)
一直以來，科學家也對這個問題很感興趣。斯坦福大學的William Frey II就是其中的一位。他收集了一些眼淚，然後檢測其中的蛋白質含量。他用來實驗的眼淚有兩種：一種是由洋蔥刺激而來的眼淚，另一種則是看了悲劇電影以後而流出的眼淚，也就是在感情波動之後留下的淚水。
在分析了兩種眼淚的化學成分之後，Frey II發現，因為情感原因而流的淚中蛋白質含量更高一些。研究發現，眼淚中的這些蛋白質主要是一些殺菌的溶菌酶，乳鐵蛋白和調節滲透壓的白蛋白，以及一些免疫蛋白。這些蛋白質佔了眼淚中總蛋白的95%，並且基本是無害的。
因為情感而流的淚中會多含有一些蛋白質激素，例如促腎上腺皮質激素和催乳素。這些蛋白質激素和人體壓力有一定的關聯。
科學家還發現，淚水中的錳含量很高，比血漿中的錳的濃度多了幾百到幾千倍。(圖片取自youmatter)
根據FreyII的研究，因情感原因流出的眼淚中蛋白質的濃度，僅僅比洋蔥刺激產生的眼淚多了大約1mg/ml。其中，蛋白質激素的濃度更低。每哭一次充其量也只能流幾十毫升眼淚。所以，分解和排出「有毒物質」的工作，主要還得靠肝臟和腎臟來做。
科學家還發現，淚水中的錳含量很高，比血漿中的錳的濃度多了幾百到幾千倍。不過，無論淚水是否因感情而流，錳含量都很高。一般來說，淚水中的錳含量只有20-40ng/ml，而人體通過尿液，汗液和糞便都可以排除錳。
如果一個人一天排出200g糞便，那麼他通過腸腔排出的錳可以抵得上流400千克眼淚。所以，眼淚中確實有些「不太好」的東西，不過含量實在太低，無法作為正常的排毒管道。憋著眼淚不流也許確實對身體不好，但肯定不是因為「眼淚有毒」。
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