Weight gain i.e. overweight is common in urban population & it is equally common in child, adult, male & female. Obesity is defined when body mass index. If there is excess fat in abdominal area i.e. visceral adiposity also known as central adiposity as more dangerous.

Harmful consequences due to obesity: In long run it may lead to diabetes, heart problem, blood pressure, joint pain, fatigue, psychological consequences as depression, anxiety, social avoidance behavior & many more consequences.

CAUSES OF OBESITY

The various causes of obesity are: 

Thyroid Disorder: Primary and secondary Hypothyroidism
Pituitary Disorder: Pan-hypopituitarism
Growth hormone deficiency
Laron Dwarf
Kallman’s syndrome
Cushing’s disease 
Leptin Deficiency: is a important cause of obesity

Cushing’s syndrome

Polycystic ovarian syndrome 
Chromosomal Syndrome: Turner’s syndrome

Hypogonadism, klienfelter’s syndrome, noonan’s syndrome
1)Hyerinsulinemia
2) Insulin Resistance syndrome
3) Syndrome X Disease
4) Idiopathic obesity 
5) Hypoythalamic Obesity : Beckwith-Wiedemann syndrome, Trauma, Inflamation – meningitis, encephalitis, Tuberculosis, syphilis, Infilitration, Sarcoidosis, histiocytosis X, Tumours – craniopharyngioma, astrocyome, astrocytome, Leukaemic leucodystrophy 
6) Drug Induced : Sulphonylurea, Insulin, Oestrogen, Contraceptive pill, Corticosteroid, Cyproheptadine, Sodium valproate, Nonselective beta adrenergic blockade, Phenothiazines, Psychotropic Drugs & many more drugs when taken for sufficient period of time.
7) Increased Fat Forming Tendency:
8) Chronic Alcohol Use
9) Gene Disorder Leading to Obesity: Prader-Willi Syndrome, Laurance – Moon Biedl Syndrome, Astrom Syndrome, DIDMOND Syndrome, Cohen Syndrome, Carpenter Syndrome, Morgagni-Stewart-Morel Syndrome.
10) Lifestyle Disorders