What they found was a genetic abnormality.

VOA: special.2009.08.26

Now there are two types of diabetes, as you may know, there's Type I Diabetes which is a genetic abnormality that usually shows up in childhood or adolescents where people are dependent on insulin.

你们可能知道,糖尿病有两种类型,Ⅰ型糖尿病是由基因异常引起的,在儿童和青少年中较为多见,患这种病需要长期依赖胰岛素

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

This abnormality interferes with the brain's ability to process speech.

VOA: standard.2010.02.11