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Standard body mass index (BMI) cut points for obesity may not apply to all ethnic groups. This study found lower BMI thresholds for metabolic risk in South Asians, Chinese, and Aboriginals compared to Europeans.

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Area of Science:

  • Cardiology
  • Endocrinology
  • Population Health

Background:

  • Body mass index (BMI) is a common metric for assessing cardiovascular disease and type 2 diabetes risk.
  • Current obesity cut points (BMI >30 kg/m2) are based on European populations.
  • The applicability of these BMI cut points to non-European populations is uncertain.

Purpose of the Study:

  • To evaluate the metabolic risks associated with BMI across diverse ethnic groups.
  • To determine if ethnic-specific BMI cut points are necessary for accurate obesity classification.

Main Methods:

  • A study involving 1078 participants from South Asian, Chinese, Aboriginal, and European ethnic groups in Canada.
  • Principal components factor analysis applied to 14 cardiometabolic markers.
  • Derivation of ethnic-specific BMI cut points based on latent factors.

Main Results:

  • Three latent factors explained 56% of the variation in glucose, lipid, and blood pressure markers.
  • South Asians, Chinese, and Aboriginals showed higher cardiometabolic risk at lower BMIs compared to Europeans.
  • Obesity cut points based on glucose and lipid factors were approximately 6 kg/m2 lower for non-European groups.

Conclusions:

  • Existing BMI cut points for obesity may require revision for South Asian, Chinese, and Aboriginal populations.
  • Implementing revised cut points could reveal a higher prevalence of obesity-related metabolic disorders in these groups.