New terminology proposed
Dr. Khunti outlined a recent large, systematic review that concluded that the definition of T2D remission encompassed substantial heterogeneity. This heterogeneity complicates the interpretation of previous research on T2D remission and complicates the implementation of remission pathways into routine clinical practice. Furthermore, Dr. Khunti highlighted a recent consensus report on the definition and interpretation of remission in T2D that explicitly stated that the underlying pathophysiology of T2D is rarely normalized completely by interventions, thus reducing the possibility of lasting remission.
Dr. Khunti also challenged the cardiovascular benefits seen after T2D remission. Recent Danish registry data were presented, demonstrating a twofold increased risk for major adverse cardiovascular events over 5 years in individuals who achieved remission of T2D, but not on glucose-lowering drug therapy.
Adherence to strict dietary interventions in the longer term was also addressed. Diet-induced weight loss causes changes in circulating hormones such as ghrelin, glucose-dependent insulinotropic polypeptide (GIP), and leptin, which mediate appetite and drive hunger and an increased preference for energy-dense foods (that is, high-fat or sugary foods), all of which encourage weight regain. Dr. Khunti suggested that other interventions, such as glucagon-like peptide 1 (GLP-1) receptor agonists or bariatric surgery, specifically target some of these hormonal responses.
The challenges in recruitment and retention for lifestyle studies were also discussed; they reflect the challenges of behavioral programs in primary care. The DiRECT study had 20% participation of screened candidates and an attrition rate approaching 30%. The seminal Diabetes Prevention Program study and Finnish Diabetes Prevention Study had similar results. At a population level, individuals do not appear to want to participate in behavioral programs.
Dr. Khunti also warned that the review of annual care processes for diabetes is declining for patients who had achieved remission, possibly because of a false sense of reassurance among health care professionals. It is essential that all those in remission remain under at least annual follow-up, because there is still a risk for future microvascular and macrovascular complications, especially in the event of weight regain.
Dr. Khunti concluded by proposing new terminology for remission: remission of hyperglycemia or euglycemia, aiming for A1c < 48 mmol/mol with or without glucose-lowering therapy. I do agree with this; it reflects the zeitgeist of cardiorenal protective diabetes therapies and is analogous to rheumatoid arthritis, where remission is defined as no disease activity while on therapy. But one size does not fit all.
Sir William Osler’s words provide a fitting conclusion: “If it were not for the great variability among individuals, medicine might as well be a science and not an art.”
Dr. Fernando has disclosed that he has received speakers’ fees from Eli Lilly and Novo Nordisk.
Dr. Fernando is a general practitioner near Edinburgh, with a specialist interest in diabetes; cardiovascular, renal, and metabolic diseases; and medical education.
A version of this article first appeared on Medscape.com.