Obesity is a complex health issue that arises from the combination of multiple factors. While psychological or hormonal factors can contribute, the most significant determinants in the development of the condition are generally a sedentary lifestyle and unhealthy eating habits. The primary causes leading to obesity can be listed as follows:

* Excessive and unbalanced eating habits
* Lack of physical activity
* Genetic predisposition
* Hormonal and metabolic disorders
* Psychological factors
* Age, gender, education level, socio-cultural, and socio-economic factors
* Frequent application of very low-calorie diets
* Smoking and alcohol consumption
* Side effects of some medications (e.g., antidepressants)
* High number of births and short birth intervals
* Insufficient breastfeeding