Aim:

To describe the theory of mid-range (TRM) "Ecological risk to develop Type 2 Diabetes Mellitus".

Methodology:

The "theoretical derivation" strategy proposed by Walker y Avant was applied starting from the Ecological Model for the Promotion of Health.

Results:

The theory explains the individual and environmental factors involved in the risk of developing Type 2 Diabetes Mellitus (DMT2).

Conclusion:

There are factors in the literature beyond the individual scope that influence risk behaviors to develop DMT2. These factors can be structured through the development of a TRM to facilitate the theoretical understanding of the phenomenon. In this case, the TRM was derived from the Ecological Model for Health Promotion and allowed addressing the risk of developing DMT2 from an ecological perspective.