牛奶缺乏膳食纤维、必需脂肪酸、烟酸、维生素c、铁，而含有过量的卡路里、饱和脂肪酸、环境化学物和疾病病原体(细菌和病毒)。
It is deficient in dietary fiber, essential fats, niacin, vitamin c, and iron, and overloaded with calories, saturated fat, environmental chemicals, and disease pathogens (bacteria and viruses).
尽管这些细菌会释放一些有用的维生素，它会产生硫化物，这也是臭气的罪魁祸首。
Though the bacteria do release some useful vitamins, they also produce chemicals containing sulfur, which is responsible for the smell in flatulence.
肠道内的细菌通常生产维生素k。
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