Body mass index (BMI) and waist circumference
Learn how to calculate your body mass index (BMI) and measure your waist circumference. These measurements tell you if you are a healthy weight.
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BMI calculator
Do you know how being overweight can affect your wellbeing? Estimate whether your weight is healthy by using the healthdirect BMI calculator to work out your BMI.
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What to do if you are underweight
Being underweight could lead to health problems such as a weak immune system and bone fractures. Discover the causes, symptoms and when to get help.
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Obesity
Obesity is a term used to describe being overweight. Obesity can lead to symptoms that affect your life. Learn about BMI, prevention and treatment options.
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Obesity in children
Childhood obesity is when a child has too much body fat for their age. There are simple steps to take to help your child move towards a healthy weight.
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Gastric bypass surgery
Gastric bypass surgery helps you lose weight by changing how your stomach and small intestine absorb food. It is usually very effective.
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Gastric sleeve surgery
Gastric sleeve surgery involves the removal of a large part of your stomach. It helps you to feel full after eating only a small amount of food.
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Lap band surgery
Lap band, also called gastric banding, is a type of weight loss that helps you to feel full after eating only a small amount of food.
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Guide to bariatric surgery
Bariatric surgery is the most effective way to lose weight and keep it off long-term. Learn about the different types of bariatric surgery.
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Reducing your risk of developing a blood clot
Blood clots occur to prevent you from losing too much blood. They can form inside a vein and move to your lungs, causing pain or serious complications.
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