In Australia, a weight is considered obese if you have a Body Mass Index (BMI) of 30 or higher, calculated from your weight in kilograms and height in meters (weight/height²), with categories for Class I (30-34.9), Class II (35-39.9), and Class III/severe obesity (40+). This standard applies to most adults, but BMI isn't perfect and can be less accurate for athletes, the elderly, or pregnant women, who might need waist measurement for risk assessment.
under 18.5kg/m2 – you are considered underweight and possibly malnourished. 18.5 to 24.9kg/m2 – you are within a healthy weight range for young and middle-aged adults. 25.0 to 29.9kg/m2– you are considered overweight. over 30kg/m2 – you are considered obese.
In adults, a BMI of 25kg/m² to 29.9kg/m² means that person is considered to be overweight, a BMI of 30kg/m² or higher means that person is considered to be obese. A BMI of 40kg/m² or higher means that person is considered to be morbidly obese.
In Australia, a size 12 is generally considered a "straight" or "missy" size, falling within average ranges, but due to vanity sizing and inconsistent measurements across brands, it can represent different body sizes; health-wise, a larger waist (over 88cm for women) is a risk factor, and the actual average Australian woman is now closer to a size 16-18, meaning a size 12 is smaller than average, though "fat" is a subjective term related to body image and health metrics like BMI, not just a single number.
Whether 80kg (176 lbs) is "heavy" for a woman depends on her height, body composition (muscle vs. fat), and frame, as Body Mass Index (BMI) can categorize it as overweight or obese for shorter women but might be healthy for taller individuals with significant muscle mass, though a BMI over 30 (obesity) is generally considered unhealthy for most. A single number doesn't define health; factors like fitness level, strength, and body shape matter more than just weight.
BMI Categories – What Your Results Mean
If you're 165 cm tall, a healthy weight is between 54 kg and 68 kg. If you weigh over 81 kg, your BMI is above 30, placing you in the obesity range.
Australian size 14 is generally a Large (L), equivalent to a US size 10, a UK size 14, and a European size 42, corresponding to bust measurements around 91-103cm (38-40 inches) and waist around 78-83cm (30.5-32.5 inches), but always check the brand's specific size chart for accuracy.
70kg isn't inherently heavy for a woman; it depends heavily on height, body composition, and build, but it often falls into a healthy range for taller women, while for shorter women, it could lean towards overweight. For example, a 175cm (5'9") woman at 70kg has a healthy BMI, but a 163cm (5'4") woman at the same weight might be considered borderline overweight, according to this article from The Daily Telegraph.
Sleep deprivation has long been linked to an increased risk of becoming overweight or obese. Researchers found that getting less than seven hours of sleep resulted in weight changes and may lead to weight gain, either by increasing food intake or decreasing energy burned.
The term of adiposopathy clearly defines the pathogenic role of adipose tissue. Four phenotypes of obesity have been described, based on body fat composition and distribution: (1) normal weight obese; (2) metabolically obese normal weight; (3) metabolically healthy obese; and (4) metabolically unhealthy obese.
Ozempic is typically recommended for individuals who have a BMI of 30 or higher, which falls into the obese category, or for those with a BMI of 27 or higher who have additional health concerns such as high blood pressure, type 2 diabetes, or high cholesterol.
Tasmania had the highest rate of obesity with 37% of adults reporting a BMI of 30 or higher, while the ACT had the lowest rate with just under 30% of adults reporting a BMI of 30 or higher.
A clear definition of morbid obesity is very important because this definition is used to guide doctors in the selection of treatment options for people who are overweight. Individuals are usually considered morbidly obese if their weight is more than 80 to 100 pounds above their ideal body weight.
The evidence: A dramatic reduction in calorie intake by substituting water for higher-calorie beverages could certainly lead to long-term weight loss. While it's hard to design a study to prove this, indirect evidence suggests a link between substituting water for high-cal beverages and weight loss.
Measuring Body Mass Index
Normal weight: BMI of 18.5 to 24.9. Overweight: BMI of 25 to 29.9. Obese: BMI of 30 or higher.
If you did actually drop a dress size in two weeks, I'd have to ask if you'd been ill, or if you'd cut out major food groups (fat, carbohydrates and protein perhaps?). To drop a dress size we're looking at a weight loss of approximately 5 to 8 kilograms (kg), which is around 1 stone.
It depends on height and muscle mass. A 175 cm woman at 75 kg with good muscle looks athletic and healthy. A 160 cm woman at 75 kg with high body fat might need to lose fat and build muscle. Check your body fat percentage, not just weight.
Whether 80 kg is overweight for a woman depends entirely on her height, as weight is relative to body size; using Body Mass Index (BMI) or height charts shows that for shorter women (e.g., under 160cm/5'3"), 80kg is likely obese, while for taller women (e.g., over 175cm/5'9"), it might fall within the healthy to overweight range, but always use a calculator for accuracy as BMI doesn't account for muscle.
How to get your BMI down
You should step on the scale first thing in the morning. That's when you'll get your most accurate weight because your body has had the overnight hours to digest and process whatever you ate and drank the day before.