Washington, October 14: Research suggests that some patients may be able to acquire a type 2 diabetes diagnosis sooner. The findings were presented at the European Association for the Study of Diabetes (EASD) Annual Meeting in Hamburg this year (2-6 October). According to this study, a number of common disorders increased dramatically in the years prior to and immediately preceding a type 2 diabetes diagnosis. Global Handwashing Day 2023 Date and Theme: Know the History and Significance of the International Event Aimed at Raising Awareness on the Importance of Hand Hygiene.

"These novel insights into the onset and natural progression of type 2 diabetes, suggest an early phase of inflammation-related disease activity long before any clinical diagnosis of type 2 diabetes is made", said senior author Dr Adrian Heald from Manchester University, UK.

"These findings hint at the potential for type 2 diabetes to be diagnosed earlier, and we hope that the distinct clinical trajectory could become a predictive tool for people at risk of the disease." World Sight Day 2023: From Leafy Greens to Eggs, 10 Foods You Must Eat for Good Eyesight and Overall Eye Health.

Type 2 diabetes is frequently linked to a rising complexity of various diseases and connected therapies. Even though there has been considerable success in identifying the genetic and non-genetic risk factors for type 2 diabetes, knowing a person's long-term clinical history before and after a diagnosis may offer new insights into the disease's aetiology and the complex trajectories of numerous other health issues.

To find out more, UK researchers from Manchester Metropolitan University, Manchester University and Salford Royal Hospital analysed longitudinal data from the Diabetes Alliance for Research in England (DARE) Study to examine the accumulation of the most common clinical conditions in 1,932 adults with and without type 2 diabetes matched by age and gender.

Data on 1,196 individuals who were eventually diagnosed with type 2 diabetes and 736 without diabetes were analysed over a period of up to 50 years (25 years pre-diagnosis and 25 years post-diagnosis). The average age at type 2 diabetes diagnosis was 53 years.

The trajectory analysis revealed that for individuals eventually diagnosed with type 2 diabetes, a number of common conditions increased consistently in the years leading up to diagnosis, specifically: high blood pressure, respiratory tract infections, heart conditions (i.e., heart failure, heart attack, angina, coronary angioplasty, coronary artery bypass graft, and heart disease), asthma, and eye, nose, and throat infections (e.g., pharyngitis, sinusitis, and conjunctivitis; see figure 1a in notes to editors).

Additionally, researchers found that immediately prior to type 2 diabetes diagnosis, more than 1 in 3 individuals experienced high blood pressure and respiratory tract infection, while around 1 in 5 had a heart condition or eye, nose, and throat infection, and 1 in 10 developed asthma. The corresponding trajectory over time was much less dramatic in those without type 2 diabetes, with fewer than 1 in 20 individuals being diagnosed with any of these conditions, apart from respiratory tract infections that were experienced by around 1 in 10.

After a type 2 diabetes diagnosis, the proportion of individuals experiencing high blood pressure, chronic obstructive pulmonary disease (COPD), retinopathy (a complication of diabetes when the retina is damaged), and infections, climbed rapidly for around 15 years before plateauing. Similarly, both heart conditions and asthma continued to increase in those diagnosed with type 2 diabetes.

"Understanding the long-term clinical history of type 2 diabetes years before diagnosis means that, in the future, people could have the time to make lifestyle changes to prevent this life-changing disease from arising", said co-author Dr Adrian Heald from Salford Royal Hospital, UK.

"This study demonstrates that subacute inflammation which manifests as the onset of hypertension, asthma or an acute infection, regardless of whether it is caused by the genome, demography or comorbidities, may serve as a precursor to the later onset of type 2 diabetes." He continued, "These observations offer a fascinating and fresh perspective on the beginning and normal development from pre-type 2 diabetes to type 2 diabetes diagnosis and beyond, implying a possible early stage of disease activity that is linked to, but not yet clinically diagnosed as diabetes. The matter of metabolic control and how this relates to a broad range of treatment factors (pharmacological and non-pharmacological) will be addressed in future work."

Despite the important findings, this is a small, retrospective observational study and cannot prove causation, and the authors acknowledge that they cannot rule out the possibility that other unmeasured factors may have influenced the results.

In addition, the authors note several other limitations, which may have affected the results, including the accuracy of the coding at the level of GP and the potential for bias through misclassification/missing data; that type 2 diabetes is a diverse disorder and the study has not examined all its possible subgroups; and that some multimorbidity may be related to socio-economic deprivation.

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