Diabetic nephropathy is a progressive kidney disease caused by angiopathy of capillaries in the kidney glomeruli. In type 2 diabetes hyperglycaemia starts after the forties, usually when the kidneys have already suffered the long‐term consequences of ageing and of other recognized promoters of chronic renal injury such as arterial hypertension, obesity, dyslipidaemia, and smoking. The disease is EFO_0004997 (type 2 diabetes nephropathy).