Abstract
Diabetes mellitus is a chronic condition characterized by high blood sugar levels, either due to insufficient insulin production or may be disturbances in immunity. Apparentaly either these two conditions or some others may be added and called as- Life style disorders are responsible to ensue the situation. Thereby if all these are compiled and different text books of great repute on the subject are concerned such as - According to Harrison's Manual of Medicine (17th edition), "Diabetes mellitus (DM) comprises a group of metabolic disorders that share the common phenotype of hyperglycemia" and according to Davidson's principle and practice of medicine (24th edition) , "Diabetes mellitus is a clinical syndrome with many causes , which is characterised by the presence of hyperglycaemia, then all these may be summarised in the form of Definition in my words as- It is an iatrogenic complex metabolic disorder, which may be considered as Syndrome, characterised by increased blood sugar levels.

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