There exists no single, precise reference for determining whether an individual is underweight, of average weight, or overweight. Over the course of years, numerous studies and surveys have assessed very large numbers of individuals in the general population in an effort to determine what could be considered average by gender, and for various age groups. Because the data differ, and also because the general population is becoming heavier over time, on average, health care professionals have differing opinions about where to establish limits as to just where normal ends and overweight begins. This accounts for why some individuals are normal on one scale and not on others.
One thing is certain, however, and that is excessive body weight is not good for your health. The most important consideration is that individuals establish a comfortable weight for their gender and age, and use the available data to assist in establishing where on the weight scale that figure lies. In the final analysis, the various charts and tables available do not differ by more than a few pounds, one way or the other.
Weight Assessment
ne of the most common indicators of body mass, including bone and muscle but, more to the point, excess body fat, is the Body Mass Index (BMI). A relatively simple calculation, the BMI is a ratio of body weight to height (kg/m
2). It is a popular index among health care practitioners, and used quite often as an approximation of weight status.
The index tends to be a poor, or unreliable measurement of body fat for children, the elderly, and for selected individuals such as athletes (who often have a large body mass attributable to muscle), the very large-framed (so-called, “big-boned”) individuals, and others whose stature or physical characteristics differ appreciably from the norm. Generally speaking, the BMI provides a good approximation of safe body weight for most adults in the general population.
Another useful indicator is circumference of the waist. This measurement, combined with body mass index, aids in determining the likely risk for a number of common health conditions.