Cortisol is the body's primary stress signal, and it has a huge range of functions.

皮质醇是身体的主要压力信号，具有广泛的功能。

The frontal lobes are so sensitive to drops in glucose, in fact, that a change in mental function is one of the primary signals of nutrient deficiency.

事实上，大脑额叶对于葡萄糖降低非常敏感，心智机能的改变是营养素缺乏的主要征候之一。