To lead a healthy and active life, the weight of the human body must be normal. It should not be over or underweight. BMI or body mass index is a term used scientifically to measure weight of an individual relative to the height. Thus, assessing if the person is overweight or underweight or normal. BMI also is an indicator of total body fat content. According to the National Institute of Health, if the BMI of a person is less than 18.5, the person is underweight. The BMI of a healthy weighing human ranges from 18.5 to 24.9. But if the BMI of a person is above 30, the person is regarded as obese.
Definition: The drop in the total mass of a human body is termed weight loss. It may also be defined in terms of reduction in BMI value of an individual. Weight loss may be an objective for overweight individuals, it is physiological loss of weight. However, in some medical conditions weight loss may be a pathological side effect.