牛肉的营养牛肉富含优质动物蛋白,且脂肪含量低;铁含量和维生素B_6含量高于猪肉、羊肉及鱼类,对增强免疫力,促进蛋白质的合成及新陈代谢很重要。它还含钾、锌、镁,这些成分与谷氨酸盐和维生素B_6共同作用,能增强免疫系统功能。牛肉虽然好处多,也要注意不能过多 Beef nutrition Beef is rich in high quality animal protein with low fat content. It is more important than pork, mutton and fish in iron content and vitamin B_6 content to enhance immunity and promote protein synthesis and metabolism. It also contains potassium, zinc, magnesium, these ingredients and glutamate and vitamin B_6 together, can enhance the immune system function. Although the benefits of beef, but also pay attention can not be too much