The numbers behind the review are stark. The latest National Health and Morbidity Survey, conducted in 2023, recorded an adult overweight and obesity prevalence of 54.4 percent, placing Malaysia second highest among Association of Southeast Asian Nations members. When the threshold is lowered to a body mass index of 23 kilograms per square metre, the cut-off increasingly considered appropriate for Asian populations, the proportion of adults at risk climbs to roughly 70 percent. Globally, obesity affected 38 percent of adults in 2020 and is projected to exceed half the world’s population by 2035, making Malaysia a case study in how rapidly middle-income nations are absorbing the metabolic consequences of nutritional transition.

The research team, led by Quan-Hziung Lim and colleagues, conducted a structured search across Web of Science, PubMed and Google Scholar, screening 3626 articles before settling on the final 179. The majority of these studies, nearly 70 percent, addressed the epidemiology of obesity, while fewer than 9 percent focused on developing new treatment modalities. Most relied on community-sampled data rather than nationally representative surveys, and the overwhelming majority were cross-sectional in design. Although randomised controlled trials increased from just three in the previous decade to 25 in the current one, most lasted less than a year, and longitudinal cohorts and pragmatic real-world trials remain scarce. This pattern, the authors note, closely mirrors the findings of an earlier scoping review covering 2008 to 2017, suggesting that the methodological profile of Malaysian obesity research has shifted only modestly over time.

One of the most consequential themes to emerge concerns how obesity itself should be measured. Malaysian studies consistently demonstrate that metabolic risk emerges well below conventional body mass index thresholds. Women with normal BMI but elevated body fat percentage, so-called normal-weight obese individuals, showed substantially higher odds of abdominal obesity, hypertriglyceridemia and hypertension. From a BMI of 23 onward, associations with undiagnosed diabetes, high blood pressure and elevated cholesterol become firmly established, and refined analyses suggest optimal hypertension prediction thresholds of around 23 kilograms per square metre for men and 24 for women. Meanwhile, waist-to-height ratio above approximately 0.5 repeatedly outperformed BMI in predicting excess adiposity and cardiometabolic disease, leading the authors to argue that a dual measurement strategy combining BMI with abdominal measures offers a pragmatic, low-cost route to earlier detection.

The review also documents a paradox familiar from international literature: in a large retrospective cohort, overweight individuals had lower all-cause mortality than those in the normal range, yet overweight and obesity contributed 7 percent of the national cancer burden, second only to tobacco smoking. Above a BMI of 30, more than three-quarters of Malaysians with obesity already carry at least one metabolic complication, and the probability of transitioning from metabolically healthy to unhealthy obesity rises by 4.4 percent with each passing year. Severe obesity at or above 35 kilograms per square metre conferred excess cardiovascular mortality for the population overall. Psychosocial evidence, though thinner, points to elevated rates of depression among people with obesity, with healthcare workers who reported depression showing double the odds of obesity, and pandemic-era surveys linking overweight status to mild-to-severe depressive symptoms.

Predisposition patterns are equally revealing. Malaysian women consistently show higher rates and risks of obesity than men, with 33 to 64 percent greater odds, and steeper increases in BMI and waist circumference with age. Prevalence peaks in middle age and declines in older adults, though the authors caution this may reflect survivorship bias rather than genuine protection. Ethnic disparities are pronounced, with Malay, Indian and other Bumiputera groups showing consistently higher odds of overweight and obesity compared with Chinese Malaysians, a pattern echoed in neighbouring Singapore. Genetic research remains exploratory, identifying variants in genes such as LEPR, ADIPOQ and FTO among local populations, but with limited immediate clinical applicability. More actionable are occupational findings: night-shift work doubled the risk of metabolic syndrome among manufacturing workers, and nurses showed particularly elevated obesity rates.

Dietary drivers form a third major thread. A quasi-historical analysis linked Malaysia’s rising obesity to a 30 percent caloric oversupply, with shifts toward wheat, sugar, meat and animal-based protein. Across multiple studies, excess intake of protein, meat, sugar, sodium and ultra-processed foods, combined with inadequate consumption of fruits, vegetables and fibre, was consistently associated with higher obesity risk. Emerging chrononutrition research suggests that meal timing matters, with late-day energy and carbohydrate intake increasing metabolic risk among people with obesity. On the policy front, the picture is sobering: four years after its introduction, nearly 80 percent of Malaysians remained unaware of the Malaysian Healthy Plate messaging concept, healthy diets remain costly, and food insecurity among rural women was paradoxically linked with higher obesity rates.

Interventional research offers cautious grounds for optimism. Twenty-two community-based lifestyle studies were reviewed, ranging from pedometer-based walking programmes to combined diet and exercise packages. The government-initiated MyBFF@home programme for urban housewives produced modest but significant reductions in weight, BMI and visceral fat at six months, though sustainability at twelve months was variable. A structured face-to-face workplace programme achieved 7 percent weight loss, substantially outperforming an online equivalent, while group-based approaches were more effective than individual counselling. Notably, 91 percent of interventions operated at the micro level, targeting individual behaviour, with almost no macro-level policy interventions tested. Modelling work suggests that meaningful weight loss through physical activity alone requires roughly 1500 MET-minutes per week, equivalent to six to seven hours of moderate activity, a bar that nearly half of sedentary Malaysians are unlikely to clear without dietary change.

Clinical treatment presents a mixed frontier. Most approved obesity medications, including newer incretin-based therapies such as semaglutide and tirzepatide, are available in Malaysia, but monthly out-of-pocket costs of 800 to 1800 ringgit are prohibitive against a median monthly income of roughly 2800 ringgit, and only about 10 percent of people with obesity are ever offered pharmacotherapy. Metabolic and bariatric surgery has expanded rapidly since 1996, with procedures more than doubling between 2010 and 2016, delivering substantial weight loss and metabolic improvement at costs between 11,000 and 30,000 ringgit. Barriers persist on both sides of the consultation: patients report weight stigma, self-blame and misperception of their own weight status, while clinicians cite time constraints and limited training. The authors conclude that Malaysia stands at a critical inflection point, requiring coordinated, whole-of-society action, stronger longitudinal and policy research, and equitable access to effective therapies to prevent the deepening of a Stage 3 obesity profile in which the burden concentrates among the poorest.

Subject of Research: Mapping and narrative review of adult overweight and obesity research in Malaysia from 2015 to 2024

Article Title: The landscape of adult obesity in Malaysia: a mapping of evidence and contemporary narrative review

Article References: Lim, Q.-H., Khoo, J.-K., Ooi, Y.-G., Ramachandaram, A., & Ratnasingam, J. (2026). The landscape of adult obesity in Malaysia: a mapping of evidence and contemporary narrative review. The Lancet Regional Health – Western Pacific, 74, Article 101963. https://doi.org/10.1016/j.lanwpc.2026.101963

Image Credits: AI Generated

DOI: 10.1016/j.lanwpc.2026.101963

Keywords: obesity, Malaysia, overweight, body mass index, waist-to-height ratio, public health, nutrition transition, lifestyle intervention, bariatric surgery, GLP-1 receptor agonists, National Health and Morbidity Survey, noncommunicable diseases