Obesity & Metabolic Disorders
Obesity
Introduction
Obesity is a chronic medical condition characterised by an excess accumulation of body fat due to dysregulation of energy balance and metabolism. It is a major contributor to preventable illness and premature death and is strongly associated with serious health conditions including Metabolic Disorders such as cardiovascular disease, type 2 diabetes, elevated cholesterol and high blood pressure. Obesity also significantly reduces physical function, mental wellbeing, and overall quality of life.
Causes and Risk Factors
Obesity is now recognised as a complex medical disease with strong genetic and biological drivers. While dietary choices and physical activity play a role, they typically account for only a minority of long-term weight outcomes. For most individuals, body weight is largely influenced by factors beyond conscious control, including genetics, hormonal regulation, and metabolic adaptation. This explains why diets alone don't achieve long term success.
Key risk factors include increasing age and a family history of obesity. Multiple genes have been identified that are strongly associated with increased body mass index (BMI), including FTO, MC4R, LEPR, PPARG, and BDNF, many of which influence appetite regulation and satiety. There is also growing evidence supporting the role of leptin resistance and impaired hormonal signalling in the development and persistence of obesity.
Complications
Obesity is one of the leading causes of preventable morbidity and mortality worldwide. It is a major underlying contributor to a wide range of chronic medical and metabolic conditions, including:
- Heart disease
- Type 2 diabetes
- Elevated cholesterol
- Fatty liver disease
- High blood pressure
- Certain cancers such as breast, bowel, and pancreatic
Obesity is also commonly associated with:
- Breathing disorders (e.g. obstructive sleep apnoea)
- Joint and mobility problems (e.g. arthritis, lumbar back degeneration)
- Gastrointestinal conditions (e.g. gallstones and reflux)
- Psychological effects (e.g. depression and reduced self-esteem)
- Reduced Fertility, PCOS and pregnancy-related complications
Diagnosis
Body mass index (BMI) is a commonly used screening tool that relates weight to height and helps classify overweight and obesity in adults. Check your BMI
BMI alone, however, does not provide a complete assessment. Other important factors include ethnic background (for example, people of Asian descent may develop metabolic complications at lower BMIs), personal and family medical history, and body fat distribution, including waist and neck measurements.
Treatment
The primary goal of obesity treatment is to improve regulation of appetite and energy balance. Effective treatment aims to help patients feel full with smaller meals, reduce hunger signals, improve gut-hormone function, and reset the body’s metabolic “set point” to achieve and maintain a healthier weight.
Lifestyle measures, including improved nutrition, reduced snacking behaviours, and increased physical activity remain important components of long-term success. However, for many patients, lifestyle modification alone is insufficient due to underlying biological drivers of weight regain.
A/Prof Taylor is one of Australia’s leading Bariatric and Metabolic surgeons, with over 20 years’ experience and more than 8,000 weight loss procedures performed. He leads OClinic, a dedicated weight management clinic with a team of dietitians, bariatric physicians, and psychologists offering both medical treatments (including GLP-1 based therapies) and surgical options such as sleeve gastrectomy, gastric bypass, and complex revisional surgery. These treatments are delivered within a comprehensive multidisciplinary weight management program. Click here to be redirected to the OClinic website.
