The interesting thing about the association of kidney disease and hypertension is that hypertension is both a cause and a consequence of declining renal function, since the kidney plays an important role in maintaining normal blood pressure. So distinguishing cause and effect here can be difficult.
Another factor that people tend to ignore in tracing the genesis of diabetic nephropathy is the considerable role of genetics in determining which diabetics are susceptible to this complication and which are not. (1) So remember, always pick the right family to be born into.
(1) H. Gu and K. Brismar, “Genetic Association Studies in Diabetic Nephropathy,” Current Diabetes Reviews, 8 (5) 336 (2012); A. McKnight, et al., “Genetics of Diabetic Nephropathy,” Current Diabetes Reports, 15 (7) 41 (2015).