There is confusion and controversy over what is your ideal weight range. The idea is to focus on a range instead of one specific number. The physiology of the body makes it very difficult to maintain a single body weight. But instead, a weight that fluctuates up and down a few pounds is more normal and easier to maintain.
Extreme fluctuation is extremely unhealthy.
Then follow that column down until you locate the row that identifies your height in feet and inches. If your body weight falls in the green zone you are to be congratulated. You are within your ideal body weight zone based on your height. If your BMI is in the red zone, you have the potential for serious health risk. Note that the red zone applies not only to those individuals who are obese, but also to those who are severely underweight.