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How much weight will I lose from weight loss surgery?

Weight loss surgery can have a variety of outcomes. The amount of weight you lose will depend on your starting weight, age, gender, general health, lifestyle and exercise routine post-surgery.

In general, expected weight loss is around 50-70% of excess body weight. Excess body weight is the difference between current weight (before surgery) and ideal weight (BMI 25). For example, a patient who is 130kg may have an ideal weight of 85kg, which means they have excess body weight of 45kg. This patient is expected to lose around 22-32kg after surgery. It is common to experience the majority of weight in the first six months after surgery.

The amount of weight lost is largely determined by the level of commitment to your weight loss journey – embracing new goals, routines and lifestyle changes. Weight loss surgery is the first step, but lifelong changes have to go along with this to ensure weight loss, and weight maintenance, occurs in the long term.

If you are struggling with slow weight loss, firstly consider some of the non-scale victories you may have achieved;

  • Improvements to health – decreased risk of developing type 2 diabetes, cardiovascular disease, cancer, fatty liver disease and other related comorbidities. Or better control of these conditions
  • Improve ability to move without pain/discomfort
  • Improvements to self-esteem and confidence

Secondly, seek advice from a healthcare professional working specialised in working weight loss surgery clients, such as your surgeon, dietitian, psychologist or exercise physiologist.