Adult Obesity Rate Rises by 26.9% Over a Decade in South Korea
South Korea’s adult obesity rate reached 35.4% in 2025, showing a 26.9% increase over the past ten years according to deep-analysis results released by the Korea Disease Control and Prevention Agency (KDCA) on November 9, 2026, using data from the 2025 Community Health Survey.
Plain English: The Clinical Takeaway
One in Three Adults: Approximately 35.4% of South Korean adults now fall into the clinical definition of obese, up 7.5 percentage points over ten years.
Demographic Shifts: Men aged 30 to 40 show the highest prevalence, while women face the steepest rates later in life, peaking at 70 years and older.
Behavioral Drivers: Sedentary habits such as skipping strength training, irregular breakfast habits, short sleep durations of six hours or less, and alcohol consumption correlate heavily with rising rates.
Ten-Year Trends and Demographic Patterns in Obesity
The latest KDCA data indicates that South Korean adult obesity grew from roughly 7.5%p a decade prior to 35.4% in 2025. Over the same ten-year window, the subjective obesity recognition rate climbed to 45.1%, and weight-loss attempts rose to 68.5%, while the national underweight rate declined steadily to 4.2%. Men exhibited an overall obesity rate of 42.5%, nearly 1.9 times higher than the 22.9% recorded among women.
Age-specific patterns revealed that male obesity peaks sharply during the thirties at 52.1% and the forties at 53.1%, before declining with advanced age. Conversely, female obesity starts at its lowest in the twenties at 16.4% and escalates progressively with age, reaching a high of 27.4% among those aged 70 and older.
KDCA noted that over the past decade, men across all age groups saw increased obesity, with twenty-somethings experiencing the largest surge at a 43.4% jump. Women in their twenties also saw the sharpest generational increase at 60.8%.
Regional Disparities and Public Health Policy Challenges
Except for Sejong, every metropolitan and provincial government across South Korea registered an increase in obesity rates between 2016 and 2025. Ulsan recorded the highest provincial obesity rate at 38.2%, followed by South Jeolla Province at 38.0% and Gangwon Province at 37.4%. Conversely, Sejong at 29.4%, Daejeon at 29.8%, and Seoul at 30.2% maintained the lowest overall rates.
| Region / Category | Highest Rates (2025) | Lowest Rates (2025) | Greatest 10-Year Increases |
|---|---|---|---|
| Provincial Level | Ulsan (38.2%), South Jeolla (38.0%) | Sejong (29.4%), Daejeon (29.8%) | Ulsan (12.2%p), South Jeolla (9.7%p) |
| County / District Level | Gangwon Cheorwon (44.2%), Danyang (42.9%) | Gwacheon (23.6%), Seongnam Bundang (24.1%) | Regional health gap verified via community survey |
At the municipal level, Gangwon Cheorwon-gun recorded the highest local obesity rate at 44.2%, while Gyeonggi Gwacheon-si recorded the lowest at 23.6%. Comparing the ten highest-obesity regions with the ten lowest-obesity regions revealed stark socio-economic and behavioral gaps. High-obesity areas demonstrated higher rates of diagnosed chronic conditions like hypertension and diabetes at 40.6%, compared to 24.1% in low-obesity areas, alongside lower household incomes and reduced walking and strength-training rates.
Five Behavioral Factors Increase Clinical Obesity Risk
The KDCA analysis linked five primary behavioral factors to increased clinical risk: omitting strength training (1.3 times higher likelihood), sleeping six hours or less per night (1.2 times), skipping breakfast (1.1 times), lacking regular walking routines (1.1 times), and consuming alcohol (1.1 times).
Kim Seung-kwan, the head of the KDCA, explained how the findings affect other areas. “Obesity is a major health problem that increases the risk of chronic diseases such as hypertension and diabetes, making it important to correctly recognize one’s weight status and practice healthy living habits such as healthy eating and regular physical activity,” Kim stated.
Kim also addressed regional policy requirements based on the survey data. “As the disparity in obesity rates and health behaviors between regions has also been confirmed, local governments and related organizations need to promote customized obesity prevention and management policies that reflect the health behaviors, socioeconomic characteristics, and local environment of local residents,” Kim added.
Obesity Rates Reach a Ten-Year Benchmark in South Korea
The 2025 Community Health Survey findings establish a ten-year benchmark showing that one in three adults now confronts clinical obesity, setting an urgent baseline for municipal public health interventions across South Korea.
References
- Korea Disease Control and Prevention Agency (KDCA) – 2025 Community Health Survey Results
