Classification of obesity: Body Mass Index BMI is a simple indicator of weight-to-height ratio that is commonly used to classify obesity and overweight in adults. This index is obtained by dividing the weight by the height square. According to the World Health Organization definition for obesity and overweight, people with a body mass index of less than 18.5 are underweight, between 18.5 and 25 are normal weight, between 25 and 30 are overweight and more than 30 are obese. Overweight and Obesity Classification (NIH)  
Based on BMI : Less than 18/5: Low weight Between 5/18 to 9/24: Normal Between 25 and 9/29: Overweight Between 30 and 9/34: Grade 1 obesity Between 35 and 9/39: Grade 2 obesity Between 40 and 50: Grade 3 obesity More than 50: Fatal obesity  
Of course, it should be noted that this index does not apply to all people. In other words, BMI can not be used for pregnant and lactating women and professional athletes or bodybuilders with high muscle mass.  
Waist circumference is the distance between the lowest rib and the iliac spine in a person who is standing in light clothing and has completely emptied his breath. Waist size more than 102 cm in men, and more than 88 cm in women are used to define abdominal obesity. Waist size is now accepted by the WHO as an indicator of health and mortality. BMI-independent waistline provides more information on mortality and health risk, but the NIH uses a combination of both.   
Topical treatments for obesity of the trunk and limbs:  
For the treatment of localized obesity and regional removal of fats, several topical treatments have been introduced. It should be noted that the patients who are suitable for these methods are as follows:  
1.Patients with a BMI <30 and a constant weight for at least one year. 2.Patients who need these methods after bariatric surgery to prevent wrinkles and body lines. 3.Patients who, despite their ideal weight, have an abnormal accumulation of brown fat in the buttocks or limbs that do not respond to any non-intervention method such as diet.