The doctor advised him to exercise more as the test showed he was pre-diabetic.

pre-diabetic 是由前缀 pre-（表示“在...之前”）和 diabetic（“糖尿病的”）组成的复合词。diabetic 来自名词 diabetes（糖尿病），加上后缀 -ic 变成形容词。 pre-diabetic 指血糖水平高于正常但尚未达到糖尿病诊断标准的状态，即“糖尿病前期”。