Background: The physiological changes associated with obesity may impair the ability to withstand the stress of critical illness, and particularly in surgical postoperative patients, the effects on cardiovascular and respiratory systems may translate into prolonged time on a ventilator or intensive care unit survival. Objectives: This review aiming at evaluation of the effect of obesity in patients admitted to intensive care unit. Materials and Methods: An electronic search was conducted in Medline using this built search strategy. The search was limited to the human studies conducted in the last 10 years. The search resulted in 368 articles and after exclusion of irrelevant, duplicated, and review articles only 26 articles were included in this review. The information about general characteristics and outcomes of these studies were collected using data sheets. Results: The predominance of weight has been consistently expanding around the world, and obesity itself is viewed as an interminable illness and additionally a noteworthy general medical issue. However, not very many information is accessible on the relationship amongst BMI and basic care result. Additionally, examine is expected to recognize vital associates of basic care in relationship to BMI with the goal that this data can be utilized to nurture patients and enhance results. Conclusion: BMI demonstrated no noteworthy effect on bleakness or mortality in basically sick patients. Mortality in basic care was related with seriousness of sickness at affirmation and ICU-related intricacies.