1. What is BMI?

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 screening is particularly important for identifying potential eating disorder symptoms.

2. How Does the Calculator Work?

The calculator uses the standard BMI formula:

Where:

• \( weight \) — Body weight in kilograms
• \( height \) — Height in meters

Explanation: The formula divides a person's weight by the square of their height to produce a standardized index.

3. Importance of BMI in Eating Disorders

Details: In Australia, BMI is used as a screening tool for potential eating disorders. A BMI below 18.5 may indicate undernutrition, while extreme fluctuations can signal disorders like anorexia or bulimia.

4. Using the Calculator

Tips: Enter weight in kilograms and height in meters. For accuracy, measure height without shoes and weight in light clothing. BMI should be interpreted cautiously in athletes and certain ethnic groups.

5. Frequently Asked Questions (FAQ)

Q1: What BMI indicates eating disorder risk in Australia?
A: BMI < 18.5 may indicate risk, but eating disorders can occur at any BMI. Psychological and behavioral symptoms are equally important indicators.

Q2: How accurate is BMI for detecting eating disorders?
A: BMI is a screening tool only. Many with eating disorders have normal BMI. Comprehensive assessment by a healthcare professional is needed.

Q3: Are there Australian-specific BMI guidelines?
A: Australia uses standard WHO BMI categories but considers lower cut-offs for Asian populations (23+ = overweight, 27.5+ = obese).

Q4: Can BMI be normal in eating disorders?
A: Yes, conditions like bulimia or atypical anorexia often present with normal BMI despite serious illness.

Q5: Where to get help for eating disorders in Australia?
A: Contact Butterfly Foundation (1800 33 4673) or your GP for assessment and referral to specialist services.