**Do you want to know whether you are over weight or not?**You must keep in mind there is a scientific method to know whether you are over-weight or underweight. Many people are concerned about their weight and sometimes many individuals especially girls, start thinking that they are over-weight but actually they aren’t. Such girls stop eating, and become very thin and weak. This condition is called anorexia nervosa.

The scientific method used to find out about weight is called Body-Mass Index.

*Factors on which Weight Depends:*

Body Mass Index depends on two factors: *Body Mass**Height of the body.*

*1. Body Mass:*Mass is the weight of the body. (Mass and weight are mostly considered same biologically but are physically different quantities) The Mass of the body is measured in Kilograms or pounds. Most of the Asian countries use Kilogram as a unit to measure mass while most of the western countries use pound to measure mass.

*2. Height of Body:*Only mass can’t be used to declare some one over or under weight. One can’t tell another person’s weight status without knowing his height. For-example, if your height is 5 feet and your weight is 70 kg and there is another person whose height is 6 ft and his weight is 70 kg then you are over weight but the other person has normal weight as his height is more.

*How to calculate Body Mass Index:*

Let us consider the above example. We will calculate the BMI of a person **(PERSON A)**whose height is 5 feet and his weight is 70 kg.

the formula of BMI is given below

BMI =

__weight in kilogram__

[ height in meters ]

^{2}

To calculate BMI, we use height in meter and weight in kilograms. So we have to convert 5 feet into meters.

1 feet = 12 inches

5 feet = 12 x 5 = 60 inches

39 inches = 1 meter

60 inches = 60/39 meters

60 inches = 1.53 meters.

look at the formula, the height is used in square. So we will take square the height.

1.53m x 1.53m = 2.35m

^{2}

We already have weight in kilograms. (if you have measure weight in pounds then multiply the weight in pounds with 0.45 to convert it into kilograms)

Now use the formula.

**BMI = 70/2.35 = 29.78**

So the BMI of this person is 29.78.

let us consider the BMI of other person with height of 6 feet and weight of 70 kg

**(PERSON B)**

6 feet = 72 inches

72 inches = 1.84 meters

Now by using the formula the BMI will be:

**BMI = 70/3.39 = 20.64**

Now you have noticed a clear difference in BMI of two persons with different heights.

*Interpretation of BMI result:*

*Interpretation of BMI result:*

Category | BMI range – kg/m^{2} | BMI Prime | Comments: |

Very severely underweight | <15 | <0.60 | Consult Doctor |

Severely underweight | 15.0 to 16.0 | 0.60 to 0.64 | Consult Doctor |

Underweight | 16.0 to 18.5 | f0.64 to 0.74 | Consult Doctor |

Normal (healthy weight) | 18.5 to 25 | 0.74 to 1.0 | Eat healthy |

Overweight | 25 to 30 | 1.0 to 1.2 | Do Regular Exercise and Modify your diet |

Obese Class I (Moderately obese) | 30 to 35 | 1.2 to 1.4 | Consult Doctor |

Obese Class II (Severely obese) | 35 to 40 | 1.4 to 1.6 | Consult Doctor |

Obese Class III (Very severely obese) | >40 | >1.6 | Consult Doctor |

Now from above result we can say that PERSON A is Overweight but not obese. He should do regular exercise, he should modify his dietary habits. He should add vegetable and fruits in his diet and skip beef, fried foods and foods high in fat and cholesterol. The PERSON B has BMI of 20.6 and it is in healthy range.

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