Is Obesity a Disease?
Obesity is often viewed as a matter of personal choice or lack of willpower—but science tells a different story. According to major medical organisations around the world, obesity is classified as a chronic disease, not just a lifestyle issue. Understanding this can be an important step toward reducing shame and seeking the right kind of support.
Obesity Defined
The World Health Organization (WHO) defines obesity as abnormal or excessive fat accumulation that presents a risk to health. It’s typically diagnosed using Body Mass Index (BMI), where a BMI of 30 or more is considered obese. While BMI has its limitations, it remains a useful screening tool in clinical settings.
Is Obesity Officially a Disease?
Yes. In fact, several leading medical bodies classify obesity as a chronic, relapsing, and progressive disease:
The World Health Organization (WHO)
The American Medical Association (AMA) (since 2013)
The European Association for the Study of Obesity (EASO)
The Irish Society for Clinical Nutrition and Metabolism (IrSPEN) supports this classification within the Irish context
This classification is based on a growing body of evidence showing that obesity involves complex interactions between genetics, hormones, environment, psychology, and behaviour—many of which are beyond a person’s control.
Why This Matters
If you live with obesity, you might have been told to "just eat less and move more." But research shows it’s rarely that simple.
Obesity is associated with real physiological changes, including:
Hormonal shifts (like leptin resistance) that affect appetite and metabolism
Inflammation that can impact cardiovascular health
Insulin resistance, which can lead to type 2 diabetes
Calling obesity a disease doesn't remove personal responsibility—but it recognises that biology plays a role, and that long-term success often requires medical and behavioural support.
Obesity and Chronic Conditions
Obesity significantly increases the risk of developing conditions such as:
High blood pressure
Type 2 diabetes
Sleep apnoea
Certain cancers
Joint pain and mobility issues
Depression and low self-esteem
Studies show that losing just 5–10% of your body weight can significantly improve many of these conditions (Ryan & Yockey, 2017).
What This Means for You
Recognising obesity as a disease helps shift the conversation from blame to care. It means that if you’re struggling with your weight, you deserve evidence-based, non-judgemental support—just like with any other chronic condition.
At our virtual clinic, we use a clinical, compassionate approach that focuses on:
Nutrition counselling tailored to your health profile
Habit-based behavioural change
Managing emotional eating and mindset
Supporting 5–15% weight loss, which is clinically significant and sustainable
Need support with your weight management journey?
At Wellth, our registered dietitians offer personalised nutrition for people living with overweight and obesity.
📝 Take our free patient assessment today and see if our service is right for you.
References:
World Health Organization. Obesity and Overweight. Link
American Medical Association. AMA Adopts Policy Recognizing Obesity as a Disease. (2013)
Ryan, D., & Yockey, S. R. (2017). Weight loss and improvements in comorbidity: differences at 5%, 10%, 15%, and over. Current Obesity Reports, 6(2), 187–194.
