before the advent of insulin, the scientific community did not understand most of the complications of diabetes , .u know why?
many patients did not survive beyond 20 years and in most people diabetes is silent for about 10 years
thats why a screening is compulsory after age 40-45, ie, any one above 45 should measure sugar level weather he has a symptom or not.
4 or 5 organs are generally the MOST affected as a COMPLICATION In diabetes
heart ,big blood vessels
small blood vessels
eye, retina ,lens- cataract
finally nerve system
apart from the immediate symptoms long term damages are those arriving after 10 to 20 years