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Body Mass Index (BMI) is a simple index of weight-for-height that is commonly used to classify underweight, normal weight, overweight and obesity in adults. In Australia, BMI is often used as a screening tool for potential eating disorders.
The calculator uses the standard BMI formula:
Where:
Explanation: BMI provides a simple numeric measure of a person's thickness or thinness, allowing health professionals to discuss weight problems objectively with their patients.
Details: In Australia, BMI is used as one indicator of potential eating disorders. A BMI below 18.5 may indicate anorexia nervosa or other eating disorders, though diagnosis requires comprehensive assessment.
Tips: Enter weight in kilograms and height in meters. For accuracy, measure weight in the morning after using the bathroom and before eating. Height should be measured without shoes.
Q1: What BMI indicates an eating disorder in Australia?
A: While BMI <18.5 may indicate risk, eating disorders can occur at any BMI. The Butterfly Foundation recommends seeking help for any concerning eating behaviors regardless of BMI.
Q2: How accurate is BMI for eating disorder assessment?
A: BMI is a screening tool only. Many people with eating disorders have normal BMIs, and low BMI doesn't necessarily mean an eating disorder is present.
Q3: What percentage of Australians have eating disorders?
A: Approximately 9% of Australians will experience an eating disorder in their lifetime, with about 4% having anorexia nervosa, bulimia nervosa or binge eating disorder.
Q4: Are there limitations to BMI?
A: BMI doesn't account for muscle mass, bone density, or fat distribution. Athletes may have high BMI without excess fat, while older people may have normal BMI but reduced muscle.
Q5: Where can Australians get help for eating disorders?
A: Contact the Butterfly Foundation (1800 33 4673), your GP, or visit the National Eating Disorders Collaboration website for resources.