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Sekar, P.; Ventura, E.F.; Dhanapal, A.C.T.A.; Cheah, E.S.G.; Loganathan, A.; Quen, P.L.; Appukutty, M.; Taslim, N.A.; Hardinsyah, H.; Md Noh, M.F.; et al. Gene–Diet Interactions on Metabolic Disease-Related Outcomes. Encyclopedia. Available online: (accessed on 16 April 2024).
Sekar P, Ventura EF, Dhanapal ACTA, Cheah ESG, Loganathan A, Quen PL, et al. Gene–Diet Interactions on Metabolic Disease-Related Outcomes. Encyclopedia. Available at: Accessed April 16, 2024.
Sekar, Padmini, Eduard Flores Ventura, Anto Cordelia T. A. Dhanapal, Eddy Seong Guan Cheah, Annaletchumy Loganathan, Phoon Lee Quen, Mahenderan Appukutty, Nurpudji Astuti Taslim, Hardinsyah Hardinsyah, Mohd Fairulnizal Md Noh, et al. "Gene–Diet Interactions on Metabolic Disease-Related Outcomes" Encyclopedia, (accessed April 16, 2024).
Sekar, P., Ventura, E.F., Dhanapal, A.C.T.A., Cheah, E.S.G., Loganathan, A., Quen, P.L., Appukutty, M., Taslim, N.A., Hardinsyah, H., Md Noh, M.F., Lovegrove, J.A., Givens, I., & Vimaleswaran, K.S. (2023, July 13). Gene–Diet Interactions on Metabolic Disease-Related Outcomes. In Encyclopedia.
Sekar, Padmini, et al. "Gene–Diet Interactions on Metabolic Disease-Related Outcomes." Encyclopedia. Web. 13 July, 2023.
Gene–Diet Interactions on Metabolic Disease-Related Outcomes

Diabetes and obesity are chronic diseases that are a burden to low- and middle-income countries.

systematic review nutrigenetics Southeast Asia genetics gene–diet interaction

1. Introduction

Metabolic diseases such as obesity and diabetes are now considered epidemics rapidly spreading across developed and developing countries affecting both sexes, age, ethnicities, and socioeconomic groups [1]. This, in turn, has shown to compromise the quality of life that leads to potentially life-threatening conditions such as cancers, cardiovascular diseases, musculoskeletal disorders, and hypertension [2]. According to the 2021 reports from the World Health Organisation (WHO), worldwide obesity has tripled since 1975, with over 650 million obese adults and more than 340 million children and adolescents who are either overweight or obese [3]. By 2022, diabetes reports from WHO indicate that more than 422 million people are diabetic with rising prevalence in low-middle income group countries (LMIC) compared to developed countries [4]. Projected trends also show that diabetes and obesity are rapidly growing and will affect nearly two-thirds of the Southeast (SE) Asian population by the end of 2030, placing a burden on rural and low socioeconomic groups [5][6]. Recent reports from the Association of Southeast Asian Nations (ASEAN) show that the tripling rate of undernutrition has not improved and that obesity and diabetes are now a double burden for these countries [7][8].
Understanding gene–nutrient interactions provide insights regarding nutritional, genetic, and biochemical determinants to better understand complex interactions between environmental factors (including diet) and genes relevant to metabolic health and dis-eases [9][10]. Several studies have also reported the importance of physical activity and nutrient intake which potentially interact with genetic predispositions of a disease that promote the progression and pathogenesis of metabolic diseases [11]. Many studies have also reported the influence of certain gene–diet interactions on metabolic disease-related traits and emphasized the importance of a healthy lifestyle that may modify the outcome of the disease or its related parameters [10][11][12][13][14][15]. A better comprehension of the relationship between genes and diet is key to making correlations between nutrition and wellness, thereby allowing for specific nutritional suggestions that are tailored to individuals or genetic subgroups. This strategy presents an appropriate public health approach [9].
The increasing prevalence of diabetes and obesity in SE Asia can be understood by the nutrition transition phenomenon, environment multiplier theory, and the thrifty gene hypothesis [16][17]. These theories provide an understanding of the dietary shift from traditional high-carbohydrate, low-fat diets towards high-energy diets (high saturated fat, sugars, and salt), and the role of inherited genetic predispositions in over-nutrition-related diseases. Dietary factors can affect the outcome of a disease and there are ethnic-specific genetic variations that influence the mechanism of these nutrient interactions [2]. Furthermore, lifestyle/dietary factors could influence genetic predispositions of metabolic disorders, especially obesity, and diabetes [18][19][20][21], making nutrigenetics research a necessity in ethnically diverse populations such as SE Asia. Nutrition science along with a better understanding of nutrigenetics in different ethnic groups is important to improvise personal and societal health [2][20]. This would ultimately add to the efforts of implementing precision nutrition specific to the populations [22][23].

2. Nutrigenetics Studies in Southeast Asia

Using PubMed and Google Scholar search engines, researchers found 19,031 articles matching the search strings. After the full-text screening, researchers included a total of 20 nutrigenetic studies related to obesity- and diabetes-related parameters carried out in SE Asia. Out of this, 16 studies examined obesity-related outcomes, 13 examined diabetes-related outcomes, and 9 studies observed both obesity, and diabetes-related outcomes. Figure 1 shows the selection of the 20 studies included. From the included studies, only three ASEAN countries (Malaysia, Indonesia, and Singapore) conducted studies to understand gene–diet interactions on metabolic disease-related traits.
Figure 1. PRISMA flowchart showing the selection of articles based on inclusion and exclusion criteria.

3. Gene–Diet Interactions on Obesity-Related Outcomes in the Southeast Asian Population

Gene–diet interactions on obesity-related traits were observed in five Malaysian, seven Indonesian, and four Singaporean studies (Figure 2, Table 1).
Figure 2. Gene–diet interactions on obesity-related traits. The figure shows the significant gene–diet interactions (p < 0.05) on obesity traits and the dietary factors that have influenced the risk of obesity in individuals carrying specific genetic variations in the Malaysian [24], Indonesian [12][21][25][26][27][28] and Singaporean [29][30] populations. GRS, genetic risk score; BMI, body mass index; EPA + DHA, eicosapentaenoic acid + docosahexaenoic; TEI, total energy intake; plus-minus symbol (±) indicates Standard deviation.

4. Gene–Diet Interactions on Diabetes-Related Outcomes in the Southeast Asian Population

Gene–diet interactions on diabetes-related traits were observed in six Malaysian, three Indonesian, and four Singaporean studies (Figure 3, Table 2).
Figure 3. Gene–diet interactions on diabetes-related traits. The figure shows the significant gene–diet interactions (p < 0.05) on diabetes traits and the dietary factors that influenced the risk of diabetes in individuals carrying specific genetic variations in the Malysian [31], Indonesian [32] and Singaporean [33][34] populations. GRS, genetic risk score; BMI, body mass index; SFA, saturated fatty acids; PUFA, polyunsaturated fatty acids; HOMA-IR, homeostatic model assessment—insulin resistance; TE, total energy.

5. Precision Nutrition Approach for the Southeast Asian Population

The understanding of genetic diversity between individuals and among different ethnic groups should be established before designing dietary and nutritional requirements because different individuals respond differently to lifestyle interventions. Human genome sequencing plays a pivotal role in understanding genetic variations among different ethnic groups and has paved the way for the concept of personalized nutrition to frame effective lifestyle intervention strategies [35]. Developments in omics technology provide a better understanding of the whole genome of individuals as well as different ethnic groups along with the transcriptome, proteome, metabolome, and metagenome [36]. Integration of Artificial Intelligence along with gene nutrient analysis, especially in populations such as SE Asia will be useful to develop public health strategies and personalized nutrition plans for cardiometabolic diseases such as obesity and diabetes.
A high-throughput genetic screening has been developed to understand the role of SNPs in cardiometabolic diseases. However, molecular and pathophysiological mechanisms to understand gene–nutrient interactions and its influence on cardiometabolic diseases remain unexplored. In LMIC such as in SE Asia, nutrigenetics is still in its infancy and requires an evidence-based approach before framing precision nutrition strategies for the population. Further, such studies on larger populations and ethnic groups as well as on different levels of nutrition transition, are crucial for the development of accurate and population-specific precision nutrition strategies effective to combat chronic, yet preventable diseases such as obesity and diabetes [2]. While the Western countries have shifted their approach towards nutrigenetics, developing countries like SE Asia still favor traditional methods for evaluating, categorizing, and managing obesity and diabetes. Costly gene testing, lack of knowledge, and experts in this field are the primary impediments of nutrigenetics implementation, particularly in LMIC. Even though this field is expanding globally, there are not many researchers in this discipline in SE Asia. Moving forward, the nutrigenetics approach should be considered for government health programs, particularly those aimed at noncommunicable diseases (NCDs). Currently, lifestyle diseases are a major burden to all countries, and long-term investments in accelerating nutrigenetics research and generating scientific evidence may provide a solution to obesity and its comorbidities through precision nutrition.


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