India is experiencing a swift transition in its health trends, shifting from a population struggling with undernutrition to one increasingly affected by overweight and obesity. Being overweight significantly increases the risk of developing type 2 diabetic population. The article presented the dynamics of males and females based on weight class relative to their BMI. Systems of nonlinear ordinary differential equations govern the equations. This work uses a differential equation model to examine obesity and overweight conditions, as well as their impacts on Diabetes mellitus. The model allows for the analysis of behaviors exhibited by individuals who are of normal weight, overweight, and obese, and it also explores how social influences and other external elements shape these behaviors. This work conducted computational simulations utilizing literature data alongside extra presumptive data validated by experts to confirm the model. Obesity is strongly linked to diabetes in the Indian population. The significant issue of obesity needs to be tackled to avert diabetes.