什么时候喝牛奶最好

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$ D  f" M8 N. d1 b* i& l很多人都不知道什么时候喝牛奶最好，这样的话很有可能会导致牛奶中的营养白白浪费，甚至还有可能会影响到人体健康。对于什么时候喝牛奶最好的问题，专家提醒所有人都应该尽量多了解，因为只有这样我们才能更好的充分吸收牛奶营养。很多人都认为早上是喝牛奶的最佳时间，那么事实真是这样吗？

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1、忌空腹

$ ]; J# \! P6 N: H! z8 y7 z专家特别提醒，喝牛奶的时间的确是在早上8-9点为最好，这个时候正是人体需要大量营养的时候。但是同时要注意，一定要避免空腹食用，很多人在早上8-9点吃早餐的时候经常是空腹喝一杯牛奶就好，这是非常不科学以及错误的饮食习惯。因为牛奶有催眠镇静作用，如果在早上空腹饮用的话就会导致我们出现昏昏欲睡的感觉，这对工作以及学习是非常不利的。
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因此要注意，在喝牛奶的时候最好是搭配主食，比如像面包、馒头、坚果等，这些食物与牛奶中的营养相辅相成，对人体健康更加有利。
2、晚上喝牛奶
其实最好的喝牛奶时间应该是在晚上，这是由于在牛奶中含有一种能使人产生疲倦欲睡的生化物l色氨酸，除此之外还有丰富的微量吗啡类物质。这些物质都具有很好的镇静催眠作用，对睡眠具有很好的促进作用。尤其是牛奶中的l色氨酸，它更是大脑合成羟色的主要原料，而五羟色胺对大脑睡眠起着关键的作用。
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很多老年人经常会有失眠的情况，这个时候更应该在晚上多喝些牛奶，其中的钙可以清除紧张情绪。因此牛奶对老年人的睡眠更有益，什么时候喝牛奶最好的最佳答案应该是在晚上。
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- n+ u6 H/ v, w; r5 Y& b9 J3、睡前
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3 \. b& I' p  M0 V- \  Y" _晚上睡觉前同样非常适合喝牛奶，不仅有利于提高睡眠质量，同时还具有很好的补钙作用。这是因为睡觉后血液中钙的水平会逐渐降低，而血钙的下降会促进甲状旁腺分泌亢进。在激素作用下骨组织中的一部分钙盐会溶解入血液中，以此来维持血钙的稳定平衡。而睡觉前喝牛奶其中的钙可缓慢的被血液吸收，并且整个晚上血钙都能得到充分的补充。

3 o3 p. s7 |* o  T- p5 W( k3 L在这种情况下就不必再溶解骨中的钙，从而帮助我们有效的起到预防骨流失、骨质疏松症等常见症状。因此在平时生活中，不妨在晚上睡觉前喝杯热牛奶。

2 z+ m( i' E. `* f! R" M7 \0 q7 D4、营养浪费

1 i( a! j+ G6 p0 x) X空腹状态下喝牛奶不仅会让人昏昏欲睡，同时对牛奶中各种丰富的营养也会造成极大的浪费。因为牛奶中的蛋白质将会从胃中很快排出，而且宝贵的蛋白质还会被人体分解作为热量被消耗掉，从而难以起到本身应有的作用。而牛奶中的氨基酸在小肠内没有来得及吸收就被排入大肠，甚至还会产生一些有害物质。
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