India: A recent study published inDiabetologiahas shed light on a unique presentation oftype 2 diabetesamong young adults in Assam, India-one that defies the conventional link betweendiabetesandobesity. Conducted by Dr. Anupam Dutta and colleagues from the Department of Medicine, Assam Medical College and Hospital, Dibrugarh, the PHENOEINDY-2 study highlights a concerning prevalence of non-autoimmune diabetes among undernourished individuals, with beta cell dysfunction emerging as the primary driver. The study involved 240 GADA-negative young adults (diagnosed with type 2 diabetes before the age of 40) and 252 non-diabetic individuals from similar socio-economic backgrounds as controls. Notably, both groups shared a median BMI of 23 kg/m². Many participants came from economically disadvantaged tea garden communities, a setting that offered critical insights into the interplay between poverty, malnutrition, and metabolic disorders. The key findings of the study were as follows: Further classification revealed that around two-thirds of the participants with diabetes belonged to the "severely insulin-deficient diabetes" (SIDD) subgroup based on the Swedish classification system. These findings point toward beta cell deficiency, rather than insulin resistance, as the primary abnormality in this population. The authors suggest that multigenerational undernutrition may play a crucial role in the development of diabetes in this setting. The study underscores the need to broaden the understanding of diabetes phenotypes in low- and middle-income countries and tailor interventions accordingly. "The PHENOEINDY-2 study calls attention to the heterogeneity of young-onset type 2 diabetes in India. In regions like Assam, where undernutrition remains a persistent issue, the conventional obesity-linked model of diabetes may not apply. Instead, chronic nutritional deprivation and associated beta-cell impairment appear to be at the heart of the disease's development," the authors concluded. Dutta, A., Dutta, P.K., Baruah, S.M. et al. Non-autoimmune diabetes in young people from Assam, India: the PHENOEINDY-2 study. Diabetologia (2025). https://doi.org/10.1007/s00125-025-06500-9