人们喝牛奶都习惯于早上,这似乎已是不成文的规定。其实,早上喝牛奶是不科学的。据国外科学家研究,牛奶里含有一种制造5—羟色胺的原料—L色氨酸。5—羟色胺有催眠作用,一杯温牛奶就可以促使人入睡。牛奶里还有微量的起镇静作用的吗啡类物质。如果早上就镇静、催眠,必然要影响白天的活动或学习。 It seems unwritten rules that people are accustomed to drinking milk in the morning. In fact, drinking milk in the morning is unscientific. According to foreign scientists, milk contains a raw material for the manufacture of serotonin-L tryptophan. Serotonin hypnotic effect, a cup of warm milk can make people fall asleep. There is also a trace of calming morphine in milk. If morning calm, hypnosis, will inevitably affect the daytime activities or learning.