Obesity is a word used in common language to mean the quality of being excessively fat. But in medicine it is also considered a medical disorder as a condition in which body fat increases to such an extent it can cause some obesity related diseases and shorten the life span.
Obesity has been recognized as a health disorders for more than 2500 years. Sushrut, a surgeon who lived in India in sixth century B.C., recognized obesity as a cause of diabetes and heart disorders. Greek physician, Hippocrates (460 B.C.-360 B.C.) described obesity as a disease itself as a harbinger of other diseases.
Because of the poverty and shortage of food for common people throughout the recorded history, obesity has always been a disease associated with the rich and wealthy. However, in twenty-first century, increasing prosperity and things like junk food has made it quite common among ordinary people also.
it happen 1984 in UK and discovered by UK researchee, and it was discovered by seeing the mice get fat.