Obesity in Singapore
One in eight Singaporean adults is obese by HPB standards. Obesity in Singapore is defined at a lower BMI threshold than global standards due to the elevated metabolic risks faced by Asian populations at lower body weight.
12.7%
Adults obese by HPB standards (NPHS 2022)
BMI 27.5
HPB obesity threshold for Asians
20–25%
Adults with metabolic syndrome
70%
Diabetics who are overweight or obese
Singapore's HPB Obesity Definition
Singapore's HPB defines obesity as BMI ≥27.5, divided into two classes:
| Category | HPB BMI Range | Risk Level |
|---|---|---|
| Obese I | 27.5 – 32.4 | High |
| Obese II | ≥ 32.5 | Very high |
For comparison, the WHO global obesity threshold is BMI ≥30. This means that a Singaporean at BMI 28 — medically obese by local HPB standards — would be classified as merely “overweight” by WHO global standards. Always use HPB Asian standards when assessing health risk for Singaporeans.
Waist Circumference: The Abdominal Obesity Measure
BMI alone does not distinguish between fat distributed throughout the body and fat concentrated in the abdomen. Visceral (abdominal) fat is metabolically far more dangerous than subcutaneous fat stored elsewhere. The HPB recommends measuring waist circumference alongside BMI for a more complete obesity risk assessment.
Singapore HPB Waist Circumference Thresholds
Men
Low risk: <90 cm
Moderate risk: 90–94 cm
High risk: ≥95 cm
Women
Low risk: <80 cm
Moderate risk: 80–84 cm
High risk: ≥85 cm
Many Singaporeans with a “normal” BMI of 22 may still have abdominal obesity with waist circumference above these thresholds. This pattern — normal BMI with high visceral fat — is sometimes called “metabolically obese normal weight” and carries real health risks.
Metabolic Complications of Obesity
- Type 2 diabetes — risk increases exponentially above BMI 27.5
- Hypertension — each 10 kg of excess weight adds approximately 5 mmHg to systolic BP
- Dyslipidaemia — high LDL, low HDL, elevated triglycerides
- Non-alcoholic fatty liver disease (NAFLD) — prevalent in ~30% of obese Singaporeans
- Obstructive sleep apnoea — disrupted sleep worsens obesity via hunger hormone dysregulation
- Metabolic syndrome — cluster of abdominal obesity, high blood sugar, high BP, abnormal cholesterol
- Increased cancer risk — colorectal, endometrial, breast, kidney
- Osteoarthritis — excess load on knee and hip joints accelerates cartilage damage
HPB Treatment Pathway
The HPB and Singapore's polyclinic and hospital systems offer a structured pathway for managing obesity:
Step 1 — Lifestyle Modification
Diet counselling, exercise prescription, and behavioural support. Available at polyclinics, subsidised under CHAS for eligible residents. First-line for all BMI 27.5+ patients.
Step 2 — Structured Weight Management
HPB-affiliated and hospital weight management programmes offering multi-disciplinary support (dietitian, physiotherapist, psychologist). Recommended for BMI ≥27.5 with comorbidities.
Step 3 — Medical Pharmacotherapy
Prescription weight loss medication for select patients with BMI ≥27.5 and obesity-related conditions, under physician supervision. Not first-line; requires prior lifestyle intervention.
Step 4 — Bariatric Surgery
Available at SGH, NUH, and private hospitals for patients with BMI ≥37.5, or BMI ≥32.5 with serious comorbidities (T2D, severe sleep apnoea). Sleeve gastrectomy and gastric bypass are most common.
Frequently Asked Questions
What is the obesity rate in Singapore?
According to the HPB National Population Health Survey 2022, approximately 12.7% of Singaporean adults aged 18–69 are classified as obese (BMI ≥27.5 by HPB Asian standards). Using the WHO global threshold of BMI ≥30, the rate would be lower at approximately 6–7%. The HPB uses the lower threshold because Asians develop serious metabolic complications at lower BMI values. Obesity rates are highest in older adults and have increased significantly over the past two decades.
At what BMI is a person considered obese in Singapore?
In Singapore, the HPB classifies obesity as BMI ≥27.5 (Obese I: 27.5–32.4; Obese II: ≥32.5). This is significantly lower than the WHO global obesity threshold of BMI ≥30. The difference means that a Singaporean at BMI 28 would be classified as obese by local standards but only overweight by WHO standards. Medical assessment and possible clinical weight management are recommended for Singaporeans with BMI ≥27.5, especially when combined with other risk factors.
What are the metabolic complications of obesity in Singapore?
Obesity (BMI ≥27.5 in Singaporeans) significantly elevates the risk of Type 2 diabetes, hypertension, dyslipidaemia (abnormal cholesterol), non-alcoholic fatty liver disease (NAFLD), obstructive sleep apnoea, and certain cancers. At the population level, approximately 70% of Singaporeans with Type 2 diabetes are overweight or obese. The metabolic syndrome — a cluster of abdominal obesity, high blood sugar, high blood pressure, and abnormal cholesterol — affects an estimated 20–25% of adult Singaporeans.
What treatment options are available for obesity in Singapore?
Singapore offers a tiered approach to obesity treatment: (1) Lifestyle modification — diet counselling and exercise programmes, available through polyclinics and subsidised under CHAS; (2) Medical weight management — physician-supervised programmes, including medication in some cases; (3) Surgical options — bariatric surgery (sleeve gastrectomy, gastric bypass) for severe obesity (BMI ≥37.5, or ≥32.5 with serious comorbidities) at public hospitals like SGH and NUH; (4) Structured programmes — the HPB and SingHealth run evidence-based weight management programmes. Early intervention at BMI 27.5 is more effective than waiting until BMI exceeds 32.5.