减肥餐里为什么是紫薯不是红薯
为什么减肥时我们要用到紫薯或红薯。
1
番薯蛋白质的含量超过大米的7倍，胡萝卜素的含量是胡萝卜的3.5倍，维生素A的含量是马铃薯的100倍，维生素B1、维生素B2的含量皆高出大米和面粉，所以从营养价值来说番薯的营养素比我们平常吃的大米或者面都要高，所以在减肥的时候避免营养素缺乏就会用到番薯。
2
番薯富含膳食纤维，饱腹感强耐消化，对于容易肚子饿有奇效；同时膳食纤维能够刺激肠道，促进排便，可以避免减肥时容易便秘的情况，还能阻止脂肪和胆固醇在肠内的吸取，又能分解体内的胆固醇，促进脂质的新陈代谢。
3
在相同的重量下番薯的热量比大米要低，大概是大米的三分之一左右，是很好的低脂肪低热量的食物。同时番薯的膳食纤维能够缓解血糖波动，有利于平复血糖帮助减肥。
上面我们说到番薯那么多的好处，其实不管紫薯还是红薯他们都是属于薯类，所以他们的基本的营养素都大同小异，如果需要对比那就是在总热量、碳水化合物、胡萝卜素、花青素之间的差异。
紫薯之所以呈紫色，因为花青素含量很高，花青素有助于抗氧化、缓解视觉疲劳、提高免疫力。
红薯含有较高的胡萝卜素，薯肉颜色越黄，胡萝卜素的含量越高。胡萝卜素还能增强皮肤抵抗力、预防心血管疾病。
总的来讲，红薯紫薯含有的营养元素基本一致，但是红薯的胡萝卜素比紫薯丰富，紫薯的花青素含量高于红薯，可以根据自己的情况来选择。
但在热量和碳水化合物中紫薯会比红薯要低，红薯的热量约102千卡/100g，紫薯的热量约70千卡／100g；红薯的碳水化合物约23.1g/100g，紫薯的碳水化合物约18.9g／100g。同时紫薯还有更高含量的矿物质。矿物质对减肥有什么用？比如钾能帮助去水肿，镁能让你运动更省力，还能降血压，所以，紫薯更适合减肥和三高人群吃。
虽然紫薯在这场比试当中胜出了，但也并不意味着红薯不好，如果你觉得紫薯成本过高，或是其中多余的功效，不会有非常大的作用的话，选择红薯加入到减肥餐当中，也是完全可行的。
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