糖尿病人到后期全身器官都被累计，吸收不好，营养不良，所以瘦。并发症是细胞长期泡糖水受伤了。

Generally, the injurious effects of hyperglycemia are separated into macrovascular complications (coronary artery disease, peripheral arterial disease, and stroke) and microvascular complications (diabetic nephropathy, neuropathy, and retinopathy).