Ramadan is a month centred on discipline, reflection and health leading experts are warning that millions of South Asian, Arab and Black Britons are being clinically overlooked due to outdated obesity measurements that fail to reflect biological reality. 

New scientific evidence presented at the House of Lords has exposed what researchers are calling an “Invisible Obesity” crisis where individuals are classified as healthy under current BMI standards despite carrying dangerously high levels of metabolic disease.

The findings coincided with the official launch of the Global Muslim Weight Management Group Ltd, a pioneering initiative calling for urgent reform in how obesity and metabolic health are defined and treated across diverse communities.

Groundbreaking data from the GlasVEGAS study, published in Nature Metabolism, confirms that the standard obesity threshold of BMI 30 is biologically inaccurate for non-Caucasian populations.

Researchers identified a stark “physiological chasm”:

• A modest weight gain of just 5kg results in a 38% reduction in insulin sensitivity in South Asian men
• This represents almost six times the metabolic damage seen in White European men with the same weight gain

Public health experts warn that this misclassification is quietly driving disproportionate rates of Type 2 diabetes, cardiovascular disease and early mortality within ethnic minority communities.

The study confirms the existence of “Invisible Obesity”, a condition where individuals may appear slim yet carry dangerous levels of internal fat around vital organs.

This phenomenon, known as “lipid overspill,” is rooted in evolutionary genetics that once protected populations during famine but now creates serious metabolic risk in a Western, ultra-processed, high-calorie food environment.

Crucially, obesity is a biological condition not a visible size. Individuals with a BMI between 23 and 30 often labelled “healthy” may already be living with significant metabolic disease.

Ramadan is traditionally a time when Muslim communities reassess lifestyle habits, nutrition and wellbeing. However, experts warn that fasting alone cannot address a systemic failure in how health risk is measured.

With millions engaging in health conversations this month, campaigners say Ramadan presents a critical opportunity to call for reform.

While NICE guidelines acknowledge lower BMI thresholds for some ethnic groups, reliance on outdated BMI visuals and uniform standards continues to create clinical barriers to diagnosis and treatment.

Key findings include:

• The Risk Gap: A South Asian individual with a BMI of 22.6 carries the same risk of Type 2 diabetes as a White European individual with a BMI of 30.
• The 5kg Trigger: Non-Caucasian populations have a lower “fat storage buffer,” meaning metabolic dysfunction begins far earlier than current BMI thresholds predict.

The crisis is most acute among women and children.

When assessed using biologically accurate metrics:

• 74% of Pakistani women are classified as living with obesity
• By Year 6, 38% of Bangladeshi boys are clinically obese by age 11

Researchers describe this as an “aggressive metabolic gain profile” that, if left unaddressed, will accelerate preventable chronic disease across communities.

Nathan Nagel (pictured above), Muslim business leader and CEO of PLORVO said: “A weight management approach aligned with biology, faith and culture is urgently needed to save lives. We are all equal as humans, yet we are different. To ignore these differences is to deny millions of people the right to health equality.”

The newly formed Global Muslim Weight Management Group Ltd is calling for:

• Immediate reform of national obesity metrics
• Earlier intervention thresholds
• Equitable access to diagnosis and treatment
• Biologically accurate clinical guidelines

Campaigners warn that failure to act will allow the Invisible Obesity crisis to escalate unchecked particularly within Muslim communities already facing disproportionate metabolic disease.

As Ramadan calls for reflection and renewal, health leaders say it must also become a turning point for health equity.