What is the BMI
The body mass index, or BMI, is a measure of how lean someone is and can be used as a guide to measure his or her osteoporosis risk. (See below to determine how to measure BMI). Doctors believe that a BMI of 20 to 25 is ideal. Anyone with a BMI of 25 or higher is considered overweight, and anyone with a BMI over 30 is considered obese. BMI below 19 is considered underweight and a risk factor for osteoporosis. Poor nutrition increases osteoporosis risk and a low BMI is often associated with poor nutrition. Poor nutrition can also affect bone health, particularly when diets are insufficient in calcium. To measure you calcium intake, please go the calcium calculator.
A person who is not at a 'normal' weight according to BMI charts may be healthy if he or she has healthy eating habits and exercises regularly. People who are thin but don't exercise or eat nutritious foods aren't necessarily healthy just because they are thin. BMI is not a perfect measure, because it does not directly assess body fat. Muscle and bone are denser than fat, so a professional athlete or muscular person may have a high BMI, yet not have too much fat. But most people are not professional athletes, and for most people, BMI is a very good gauge of their level of body fat. Body composition for athletes as well as most people is often better calculated using measures of body fat.
How to calculate your BMI (for adults over 20 years old)
Calculating your own BMI is very easy if you know your height and weight:
1. Measure your height (h) in metres and multiply the figure by itself
2. Measure your weight (w) in kilograms
3. Divide your weight by your height squared i.e: BMI = w/(h x h)
This calculator has been reviewed by lactical health professionals and is based on reputable sources of medical research. It is not a diagnostic tool and should not be relied on as a substitute for professional medical or other professional health advice.