10 E 66. ICD - 9 278 OMIM 601665 DiseasesDB 9099 MedlinePlus 003101 eMedicine med/1653 MeSH C23.888.144.699.500 Obesity is a medical condition in which excess body fat has accumulated to the extent that it may have an adverse effect on health, leading to reduced life expectancy . [1] [2] Body mass index