推荐回答(2个)
羊奶被称为「奶中之王」,那羊奶真得比牛奶营养价值高吗?对于不同需求的人群,牛奶和羊奶又该如何选择呢?
从能量、碳水、蛋白和脂肪的含量上来说,两者差不多。所以对于控制体重的朋友们来说,喝哪个都一样。
牛奶和羊奶也不是所有的营养素含量都差不多,两者的烟酸和维生素 B12 含量差异就很大,羊奶的烟酸含量是牛奶的 3.1 倍,而牛奶的维生素 B12 含量却是羊奶的 6.4 倍。
但是烟酸和维生素 B12 都广泛地存在于动物性食品中,只要不是只吃素,基本不会缺这两种营养素,不必刻意喝奶补充。
另外,考虑到喝奶的一个重要目的是补钙,所以我们重点分析一下牛奶和羊奶的钙含量差异。
中国居民膳食指南建议每天吃 300 克奶制品,虽然喝 300 克羊奶比喝 300 克牛奶能多摄入 63 毫克的钙,可却要为此多花 9.9 元,用这 9.9 元买纯牛奶喝,能多摄入 951 毫克的钙。
所以,从补钙的角度考虑,牛奶的性价比远远高于羊奶。
有人选择羊奶,是因为对牛奶中的乳糖不耐受。
实际上,牛奶和羊奶中的碳水化合物主要都是乳糖,羊奶虽然碳水化合物含量比牛奶低,但是每 100 克奶仅低 0.35 克,对改善乳糖不耐受的贡献实在太小了。
所以,对于乳糖不耐受的人群来说,喝酸奶才是更好的选择。
还有的人喝羊奶是因为对牛奶蛋白过敏,实际上,羊奶和牛奶的蛋白在氨基酸组成上高度类似,对牛奶蛋白过敏的人往往也会对羊奶蛋白过敏,所以并不存在「喝羊奶不容易过敏」的说法。
总而言之,羊奶和牛奶营养价值差不多,羊奶并没有宣传的各种神奇功效,考虑性价比的话,还是喝牛奶吧。
其实各有各的好。
1、牛奶中的钙含量略胜一筹,两种奶的钙吸收率大致相同。因此,补钙方面,牛奶效果更好。
2、牛奶蛋白质含量最高,不过从蛋白质吸收率来说,羊奶比牛奶更易消化吸收,而且羊奶蛋白微粒小,对牛奶过敏和体质较弱人群可选用羊奶。
3、饱和脂肪酸和不饱和脂肪酸的比例约为:牛奶2.48,羊奶2.37,牛奶和羊奶中的不饱和脂肪酸含量相对较高,更符合人类需求。另外,羊奶中脂肪颗粒小、分布匀,对肠胃功能不好的人来说,更易消化吸收。
4、牛奶中富含维生素A和维生素B2,但羊奶中尼克酸含量较其他奶类高很多,铁的含量也远远高于其他奶类。
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