不知道各位朋友还记不记得前段日子新闻里，微博里，微信里满天飞的消息，说是不要吃红肉！今天我们在这里不说为啥不能吃，我们只来了解下为啥牛啊猪啊的肉是红色的，而那些鱼啊，鸡啊的肉是白色的！
牛肉主要由慢肌（slow-twitch muscle）组成，其收缩的反应速度较慢，且持续时间相对比较长。相反，快肌（fast-twitch muscle）为了给快速运动提供支撑，其收缩的反应比较快。也就是说，花更多时间站立和慢慢踱步的动物相较于运动频繁且激烈的动物拥有更多的慢肌，它们的肉色也就更深一点。这就是为啥奶牛的肉如此深红，而农场的散养鸡和水里游不停的鱼拥有更多白色的肉。
慢肌依赖于肌红蛋白（myoglobin）的存在，肌红蛋白是一种红色的蛋白质，用来储存氧气并使得肌肉运动；而快肌中则用较轻的糖元（glycogen）来替代能量。
当氧气与肌红蛋白中的铁原子结合后，肉会呈现出鲜艳的红色，过了几天后，肌红蛋白会慢慢失去结合的能力，肉也会慢慢变成棕色。这也是为什么大家可以用肉的红色程度来判断肉质新鲜与否的缘由。当然有的时候，由于保存在密封的塑料袋中，使肉无法接触氧气，从而导致新鲜的肉也会呈现出棕色的状态。这时候，肉商们会在包装袋中加入一氧化碳使肉看起来更红艳、更多汁一点！
在烹调红肉的时候，当肉中的肌红蛋白被加温超过60摄氏度，肉的颜色开始慢慢变深，从红色最终转换成棕色。
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