Question

How is bmi used to determine the undernourishment of a person explain?

Answer 1

The BMI is defined as the body mass divided by the square of the body height, and is universally expressed in units of kg/m2, resulting from mass in kilograms and height in metres.
Commonly accepted BMI ranges are underweight: under 18.5 kg/m2, normal weight: 18.5 to 25, overweight: 25 to 30, obese: over 30.
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Answer 2

BMI stand for Body Mass Index 
it can be calculated by 
BMI=weight/square of height
it it is more than 25 than the person is obese and if the value is less than 18.5 then the person is under nurished