The global diabetes epidemic is a major public health issue, affecting millions worldwide, with Asia being the epicenter. Type 2 diabetes is driven by rapid urbanization, nutrition transition, and sedentary lifestyles, leading to increased obesity and diabetes prevalence. Asians develop diabetes at younger ages and lower BMI levels compared to Caucasians, partly due to the "normal-weight metabolically obese" phenotype, high smoking and alcohol use, and high intake of refined carbohydrates. Poor nutrition in utero and early life, combined with overnutrition later, also contributes to the epidemic. Genome-wide association studies have improved understanding of diabetes pathophysiology, but genetic factors alone cannot fully explain ethnic differences in diabetes risk. Interactions between Westernized diets and genetic backgrounds accelerate the epidemic. Epidemiologic studies and clinical trials show that type 2 diabetes is largely preventable through diet and lifestyle changes. However, translating these findings into practice requires policy changes in food, built, and health systems. Prevention through healthy diets and lifestyles should be a global public health priority. Diet quality, particularly high glycemic load and trans fat, increases diabetes risk, while cereal fiber and polyunsaturated fat reduce it. Sugar-sweetened beverages also increase risk. Obesity and fat distribution are major drivers, with Asians showing increased insulin resistance despite lower BMI. Physical inactivity, especially prolonged TV watching, increases diabetes risk. Smoking is an independent risk factor, with current smokers having a 45% higher risk of diabetes. Alcohol consumption in moderation is associated with lower risk, while heavy drinking has adverse effects. Inflammation is linked to diabetes risk, with a proinflammatory dietary pattern increasing risk. Genetic susceptibility and gene-environment interactions play a role, but current genetic loci are insufficient to explain ethnic differences. The thrifty genotype hypothesis suggests that genetic factors may have evolved for survival in times of scarcity, but evidence is limited. The thrifty phenotype hypothesis suggests that fetal undernutrition leads to metabolic changes that increase diabetes risk in adulthood. Prevention through lifestyle changes is effective, with clinical trials showing significant reductions in diabetes risk. Public health strategies must address environmental factors to reduce diabetes prevalence. Global policies should prioritize healthy diets and lifestyles to combat the epidemic.The global diabetes epidemic is a major public health issue, affecting millions worldwide, with Asia being the epicenter. Type 2 diabetes is driven by rapid urbanization, nutrition transition, and sedentary lifestyles, leading to increased obesity and diabetes prevalence. Asians develop diabetes at younger ages and lower BMI levels compared to Caucasians, partly due to the "normal-weight metabolically obese" phenotype, high smoking and alcohol use, and high intake of refined carbohydrates. Poor nutrition in utero and early life, combined with overnutrition later, also contributes to the epidemic. Genome-wide association studies have improved understanding of diabetes pathophysiology, but genetic factors alone cannot fully explain ethnic differences in diabetes risk. Interactions between Westernized diets and genetic backgrounds accelerate the epidemic. Epidemiologic studies and clinical trials show that type 2 diabetes is largely preventable through diet and lifestyle changes. However, translating these findings into practice requires policy changes in food, built, and health systems. Prevention through healthy diets and lifestyles should be a global public health priority. Diet quality, particularly high glycemic load and trans fat, increases diabetes risk, while cereal fiber and polyunsaturated fat reduce it. Sugar-sweetened beverages also increase risk. Obesity and fat distribution are major drivers, with Asians showing increased insulin resistance despite lower BMI. Physical inactivity, especially prolonged TV watching, increases diabetes risk. Smoking is an independent risk factor, with current smokers having a 45% higher risk of diabetes. Alcohol consumption in moderation is associated with lower risk, while heavy drinking has adverse effects. Inflammation is linked to diabetes risk, with a proinflammatory dietary pattern increasing risk. Genetic susceptibility and gene-environment interactions play a role, but current genetic loci are insufficient to explain ethnic differences. The thrifty genotype hypothesis suggests that genetic factors may have evolved for survival in times of scarcity, but evidence is limited. The thrifty phenotype hypothesis suggests that fetal undernutrition leads to metabolic changes that increase diabetes risk in adulthood. Prevention through lifestyle changes is effective, with clinical trials showing significant reductions in diabetes risk. Public health strategies must address environmental factors to reduce diabetes prevalence. Global policies should prioritize healthy diets and lifestyles to combat the epidemic.