If the liver fails to function, it can't break down proteins, so you have to limit the rate at which protein is absorbed in order to avoid further damage.
但當病人肝功能嚴重衰竭，已無法分解外來蛋白、合成組織蛋白時，卻必須限制其蛋白質攝取量，以免導致病情的惡化。