Prediabetes, a condition often overlooked, may have a more significant impact on weight management than previously thought. New research presented at the European Congress on Obesity (ECO) in Istanbul reveals that prediabetes can leave a lasting molecular imprint on fat tissue, making weight loss maintenance after bariatric surgery more challenging. This finding highlights the need for a deeper understanding of the underlying mechanisms and potential interventions.
The study, conducted by Dr. Ana de Hollanda and her team at Hospital Clínic de Barcelona, focused on 78 women with severe obesity. Participants were divided into two groups based on their glucose and HbA1c levels, with one group having normal glucose tolerance and the other prediabetes. The researchers analyzed gene expression in subcutaneous fat tissue samples collected at the time of surgery and one year later, using microarray technology.
Before surgery, women with prediabetes exhibited higher glucose and insulin responses during a mixed-meal test, a higher prevalence of fatty liver, and an unfavorable lipid profile. These findings suggest that prediabetes may already be associated with metabolic dysfunction, even before significant weight loss occurs.
One year after surgery, both groups showed marked improvements in glycaemic and metabolic parameters. However, the key revelation was that gene activity in fat tissue remained distinct between the groups. Women with prediabetes had less active genes involved in lipid metabolism, including key regulators like SREBF1 and FADS2, indicating a persistent impairment in the ability of adipose tissue to handle fats efficiently.
This blunted lipid metabolism was accompanied by higher cholesterol levels and greater weight regain in the prediabetes group. On average, women with prediabetes regained around 5-6 kg between years 1 and 3, while the control group regained minimal weight. The study's findings suggest that prediabetes may hinder the fat tissue's ability to adapt to weight loss, potentially contributing to long-term weight regain.
Dr. de Hollanda emphasizes the importance of these findings, stating that prediabetes is associated with persistent changes in fat tissue that are not fully reversed by bariatric surgery. These alterations in lipid metabolism may reduce the ability of adipose tissue to adapt after weight loss, which could be a significant factor in the variable long-term outcomes of bariatric surgery. The study's limitations, including its observational nature and lack of diversity, highlight the need for further research to confirm these findings and explore potential interventions.
The implications of this research are far-reaching. It suggests that prediabetes may be a critical factor in the success of bariatric surgery, and understanding the molecular changes in fat tissue could lead to targeted interventions. These interventions could potentially include dietary modifications, pharmacological treatments, or lifestyle strategies aimed at improving adipose tissue function and its ability to adapt after weight loss. Further research is needed to identify these strategies and determine their effectiveness in a broader population.
In conclusion, this study sheds light on the lasting impact of prediabetes on fat tissue and its potential implications for weight management after bariatric surgery. It raises important questions about the underlying mechanisms and the need for personalized approaches to weight loss and maintenance. As we continue to explore the complexities of obesity and its management, understanding the role of prediabetes could be a crucial step towards more effective and sustainable solutions.
