BMI, meaning Body Mass Index was devised in 1830s by Belgian Mathematician Lambert AJ Quetelet (Quetelet Index), is a method to measure obesity. It is a 100% non-invasive method of measuring body fat and is derived from the weight and height of an individual and helps indicate whether the individual is healthy weight, overweight, underweight or Obese.
BMI is defined as body weight in kilograms divided by the square of body height in meters.
The following categorization is used for adults (Over 20 years of age) -
Underweight = BMI < 18.50
Healthy Weight = BMI 18.50 to 24.9
Overweight = BMI 25.00 to 29.90
Obese = BMI > 30.00
For children and teens (2 to 20 years of age), BMI is calculated the exact same way as it is for adults, but it is also compared to the percentile BMI for age. This is a gender specific method of measuring BMI for children and teens as the amount of body fat differs in boys and girls from 2 to 20 years of age.
Underweight = BMI for age < 5th percentile
Healthy Weight = BMI for age 5th to 85th percentile
Overweight = BMI for age 85th to 95th percentile
Obese = BMI for age > 95th percentile
BMI is a widely used tool to gauge body mass and curb weight issues by amending the lifestyle and eating habits. It helps doctors to diagnose underlying conditions and prescribe medication & diet plans.
Patients with a healthy BMI experience increased energy, improvement or resolution in co-morbid condition and increased blood circulation. This reduces the risks of diabetes, high blood pressure, heart diseases and cancer and helps them lead a mentally and physically healthier life.
Bariatric Surgery is offered if BMI exceeds 32.5 in presence of associated diseases or beyond 37.5 when no co morbidity is present.
Body Composition Analysis
Body fat and composition analysis is done using bioelectrical impedance analysis that calculates the amount of fat, muscle, bone and water content of the patient. As different tissues have variable resistance to passage of current, these parameters are calculated and documented.
Authored By Dr.Nikhil Agnihotri