Long-Term Effectiveness of Diabetes Prevention Strategies
Current Diabetes Epidemic
Researchers have recently explored the long-term effectiveness of diabetes prevention strategies concerning diabetes-related morbidity and mortality. Presently, diabetes affects over 415 million adults globally, a number expected to rise to approximately 642 million by 2040. In 2012, diabetes treatment costs exceeded $245 billion in the U.S. healthcare system, prompting investigations into various prevention strategies aimed at lowering the risk of type 2 diabetes. Both genetic and environmental factors, including family history, obesity, and physical inactivity, play significant roles in the onset of this chronic disease.
Cost-Effectiveness of Prevention Strategies
Previous studies across different populations have demonstrated that primary diabetes prevention is cost-effective and helps alleviate the growing economic burden. However, a major challenge persists in effectively translating research findings into practical applications that can reduce diabetes incidence. Despite the introduction of several diabetes prevention strategies, including lifestyle changes and medication, there is limited knowledge about which methods provide the best long-term efficacy.
Evaluating Strategies for Diabetes Prevention
Systematic Review and Meta-Analysis
To address the gap in long-term efficacy evidence, U.S. researchers conducted a systematic review and meta-analysis published in JAMA Internal Medicine. This study aimed to update the evaluation of various non-surgical diabetes prevention strategies and their long-term effectiveness on diabetes incidence. The analysis drew on data from numerous randomized clinical trials that assessed lifestyle modifications and drug interventions lasting longer than six months in adults over 18 years old at risk for diabetes.
The meta-analysis included 49,029 participants from 43 trials conducted between 1990 and 2015. The primary outcome measured was the total relative risk of diabetes in treatment groups compared to a control group. The study evaluated 19 medications, including insulin-sensitizing agents, 19 lifestyle modifications aimed at promoting weight loss, and five combinations of medication and lifestyle changes.
Impact of Lifestyle Changes and Medications
Results indicated a significant correlation between lifestyle modifications and a 39% reduction in the relative risk of diabetes, while medications contributed to a 36% reduction. The most substantial decrease in diabetes risk was observed in patients employing a combined approach of dietary changes, physical activity programs, and medications, including insulin sensitizers and weight-loss therapies.
However, it was noted that the benefits of medication did not persist if the treatment was discontinued. In contrast, the long-term effects of lifestyle changes continued for several years even after the intervention ended, though they gradually diminished over time.
Limitations and Future Directions
Study Limitations
The study acknowledged certain limitations, including the use of English search terms which excluded relevant clinical trials published in other languages. Additionally, the analysis did not allow for a direct comparison between medications and lifestyle modifications, as a network meta-analysis would be required for such an assessment.
Implications for Diabetes Prevention
The findings suggest that adults at high risk for developing type 2 diabetes can benefit equally from both lifestyle modifications and medications that promote weight loss and healthy living. The diverse approaches evaluated can enable clinicians to tailor preventative care and treatment strategies based on individual circumstances, motivations, and available resources.
However, the study revealed that the long-term effects of medications are generally short-lived, whereas lifestyle modifications exhibit more sustained benefits. Therefore, future research should focus on cost-effective strategies to maintain these lifestyle changes and their impact on diabetes prevention, addressing the global diabetes burden.
Written by Lacey Hizartzidis, PhD
Haw JS, Galaviz KI, Straus AN, Kowalski AJ, Magee MJ, Weber MB, Wei J, Narayan KMV, Ali MK. Long-term Sustainability of Diabetes Prevention Approaches: A Systematic Review and Meta-analysis of Randomized Clinical Trials. JAMA Intern Med. Published online November 06, 2017. doi:10.1001/jamainternmed.2017.6040