Edmonton Obesity Staging System (EOSS)

Stages obesity-related medical, functional, and psychological burden.

Obesity-related medical risk factors*

No obesity-related medical risk factors identified0

Early metabolic abnormalities or borderline risk factors (e.g., borderline hypertension, impaired fasting glucose, mildly abnormal liver enzymes)+1

Established obesity-associated chronic disease (e.g., hypertension, type 2 diabetes, sleep apnea, osteoarthritis, reflux disease, PCOS)+2

Advanced obesity-related complications or evidence of end-organ injury+3

Severe or end-stage obesity-related disease burden+4

Physical symptoms or functional limitations*

No physical symptoms or activity limitations0

Mild symptoms with minimal impact on daily activities+1

Moderate limitations affecting routine activities or well-being+2

Marked functional impairment affecting work or daily tasks+3

Severe disabling functional limitation+4

Psychological symptoms*

No obesity-related psychological symptoms0

Mild psychological impact or reduced well-being+1

Moderate psychological symptoms affecting quality of life+2

Significant psychological burden with major impact on well-being+3

Severe disabling psychological symptoms+4