How is obesity measured scientifically?
Your bathroom scale may give you a measure of your weight and help you follow changes in your weight, but it is not the best way to determine if you are overweight or obese, or at risk for developing obesity and its related health conditions. Other measurements can help you find out more about your body composition.
Obesity is often expressed in terms of Body Mass Index(BMI). A BMI of 30 or more in males and 28.6 or more in females indicates obesity [Body Mass Index = weight (kg)/height2(m)].

Body Mass Index(BMI):-
BMI is a number based on both your height and weight. It can help you determine the degree to which you may be overweight and gives a reasonable assessment of total body fat for the general population.
Knowing your BMI is important for you and your family because it correlates better with health conditions like heart disease and types 2 diabetes than does weight itself. BMI is not perfect. Some people, like athletes, may measure a high BMI but have more muscle than fat.
Healthy than fat.22to25
Overweight 25to29.9
Obesity(Class 1) 30to34.9
Obesity(Class 2) 35 to 39.9
Severe Obesity(class 3) 40 or more

Methods to Assess Obesity.
1. Body weight- If a person is more than 10% (15% for women) standard weight he is obese.
2. Broca indies: Ht (cm) minus 100. For example, if a person’s height is 160 cm then the ideal weight is 60kg.
3. Body Mass Index
BMI = Weight(kg)/Height2(m)
4. Measurement of body fat: skinfold callipers are used to measure total body subcutaneous tissue.
5. Waist to hip ratio:> 0.35 (females) and 1.0 (males) is associated with obesity.

What is the ideal height weight chart for adults?
For Indians, the Life Insurance Corporation, which is supposed to be the largest insurer of human life in India, has formulated a chart based on their findings of longevity and lack of disease in people. The ideal weight of the people is rated according to the weight height chart given below. Remember, the height is the main determinant of weight, not age.

What is the difference between BMI and height/weight tables?
Difference between BMI and height/weight tables:
Height/weight tables identify an ideal weight range for each height, and BMI uses cut points (Table 1) for you to identify if you are at a healthy weight, overweight, obese or severely obese, based on your height.
– Unlike the tables, BMI corresponds generally to measurements of body fat.
– Height/weight tables are not designed to predict disease risk, but BMI can. The higher the BMI, the higher your risk of developing certain diseases associated with obesity.
– Medical researchers often use BMI, not height/weight tables, when studying the effects of body weight on health.
There is not BMI chart used for adult men, women who are not pregnant and generally for all racial/ethnic groups. There are separate height/ weight tables for men and women.

How do I determine my waist-hip ratio?
Waist-to-hip ratio (WHR) looks at the proportion of fat stored on your body around your waist and hip. It is a simple but useful measure of fat distribution. Most people store their body fat in two distinct ways: around their middle (apple shape) and around their hips (pear shape).

How to calculate the waist-hip ratio?
Waist-hip-ratio is calculated by dividing your waist measurement by your hip measurement. (Hips are the widest part of your butt)
The best waist-hip ratio for men and women
Ideally, women should have a waist-to-hip ratio of 0.8 or less. Ideally, men should have a waist-to-hip ratio of 0.95 or less.