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检查单解读 几年前,每当完成一台手术，我就喜欢跑到休息室,咕咚几口冰可乐。瞧见我饥不可耐狂饮可乐的护士们，在一边坏笑起来。连忙探听后，有人对我嘀咕：可乐是杀精的。当时，我就震惊啦！换句话说，她们的潜台词是，你小子现在喝的痛快，以后会没生殖力的。
婚后，我照样喝点可乐。外婆每看见一回，便循循善诱又抹不开嘴似的对我说：“男的喝可乐不好。”我反问道，为什么呢？老人家的回答简洁却掷地有声：“生不了小孩！”当时，我没有被震惊。 复旦大学附属妇产科医院集爱遗传与不育诊疗中心江峰
最近有丹麦大学研究指出，每日饮用约一公升可乐的男士，精子数量较一般人少三成。报导一出令男士们对可乐饮料显得有点顾忌，有女性朋友更笑指，在完成生育大计前都会阻止丈夫饮用可乐饮料！
为了生育而要完全戒掉可乐未免有点夸张。其实有关研究没有确定可乐与精子数量的直接因果关系，亦未能确定是不是与可乐中的咖啡因有关；而研究中的每天饮用量亦是较大，不必太快对号入座。不过，这报导却提醒我们生活习惯也有机会影响生育，值得计划生育中的朋友注意。
很多时有关生育或不育的焦点都放在女性身上，而忽略了男性的角色。其实男性的精子数量及质量也是生育的关键。一些容易被轻视的不良生活习惯，包括酗酒、吸烟等，还有长期让睪丸处于高温环境中，也会减低男性制造精子的能力。而过量饮用如可乐这类高糖分饮料，容易引致 肥胖 及 糖尿病 等问题，也有机会对精子制造构成影响。
此外，若男性原本就有精液质量异常、睪丸功能失调或输精管道梗阻等问题，则更有机会造成不育。所以，若有隐睪症、曾患 腮腺炎 、睾丸附睾炎、输精管或前列腺等曾受感染或接受过手术等，若尝试生育计划一年以上仍未成功，便应尽快接受检查。
Caffeine Intake and Semen Quality in a Population of 2,554 Young Danish Men
Received for publication August 19, 2009. Accepted for publication January 8, 2010.
The authors examined the association between semen quality and caffeine intake among 2,554 young Danish men recruited when they were examined to determine their fitness for military service in 2001–2005. The men delivered a semen sample and answered a questionnaire including information about caffeine intake from various sources, from which total caffeine intake was calculated. Moderate caffeine and cola intakes (101–800 mg/day and 14 0.5-L bottles of cola/week) compared with low intake (100 mg/day, no cola intake) were not associated with semen quality. High cola (>14 0.5-L bottles/week) and/or caffeine (>800 mg/day) intake was associated with reduced sperm concentration and total sperm count, although only significant for cola. High-intake cola drinkers had an adjusted sperm concentration and total sperm count of 40 mill/mL (95% confidence interval (CI): 32, 51) and 121 mill (95% CI: 92, 160), respectively, compared with 56 mill/mL (95% CI: 50, 64) and 181 mill (95% CI: 156, 210) in non-cola-drinkers, which could not be attributed to the caffeine they consumed because it was<140 mg/day. Therefore, the authors cannot exclude the possibility of a threshold above which cola, and possibly caffeine, negatively affects semen quality. Alternatively, the less healthy lifestyle of these men may explain these findings.
caffeine; cola; fertility; reproductive medicine; semen analysis
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