It really depends on where you make the diagnosis during the course of the disease. In the early stages, lifestyle management could significantly control the progression of the disease and even reverse the process. However, you would not expect the same outcome in a patient already afflicted with DM complications. Overall, the goals in the treatment of a patient with DM are to eliminate the symptoms related to hyperglycemia; reduction or elimination of DM micro- and macrovascular complications. In the same time it is important to notice that our interventions should not interfere with the patients normal life.
It will be an interesting research question to further explore! Epigenetic biomarkers would be a suitable platform to test the hypotheses; whether over time, type 2 diabetes could further progress, regress or remain static. Of course, these pathways would definitely depend on the influence of covariates like genetic, environmental or lifestyle attributes.