Study Reveals Mediterranean-Style Diet Tailored for Southeast U.S. Promotes Weight Loss and Improves Diet Quality

A recent study demonstrates that a Mediterranean-style dietary pattern tailored for the Southeastern United States can enhance diet quality and support weight loss among adults.

Researchers at the University of North Carolina at Chapel Hill, along with collaborating institutions, have found that a Mediterranean-style eating pattern, adapted for the food preferences and availability of the Southeast, can significantly improve diet quality and facilitate weight loss. The study, termed DELISH (Delicious Eating for Life in Southern Homes), examined the efficacy of a ‘Med-South’ dietary pattern which emphasizes the consumption of nuts, vegetable oils, whole grains, non-starchy vegetables, and fruits. The findings are detailed in a publication in JAMA Network Open.

Study Overview and Leadership

The research was spearheaded by co-principal investigators Dr. Thomas Keyserling, a professor of medicine at the Division of General Medicine and Clinical Epidemiology within the UNC School of Medicine, and Dr. Carmen Samuel-Hodge, a research professor in the Department of Nutrition at the UNC Gillings School of Global Public Health. Dr. Samuel-Hodge also directs the Evaluation Core for the UNC Center for Health Promotion and Disease Prevention (HPDP), which served as the administrative hub for the research.

The Med-South Weight Loss Program was developed to align with Mediterranean dietary principles while incorporating foods commonly consumed in the Southeastern U.S. The primary objective was to determine whether this dietary approach could yield sustained weight loss and enhance diet quality compared to a traditional program focused solely on caloric restriction.

Methodology

The study involved 360 adults with a body mass index (BMI) of 30 or higher, recruited from primary care practices in central North Carolina. Participants were randomly assigned to one of two interventions: the Med-South Weight Loss Program or a control group that primarily aimed at reducing caloric intake. Over a span of 24 months, participants in the Med-South program engaged in three distinct phases:

• Phase 1: Focus on improving diet quality.
• Phase 2: Concentrate on weight loss while adhering to the Med-South eating pattern.
• Phase 3: Maintain weight loss achieved.

Throughout the study, researchers collected data on body weight, diet quality, blood pressure, and other health metrics at intervals of four, 12, and 24 months. Diet quality was evaluated using food intake questionnaires and a device known as the Veggie Meter, which measures carotenoid levels in the skin. Carotenoids, found abundantly in various fruits and vegetables, serve as a reliable indicator of dietary intake of these food groups.

Key Findings

Dr. Keyserling emphasized the importance of integrating healthful dietary patterns into lifestyle weight loss programs, stating, “Incorporating a healthful dietary pattern into lifestyle weight loss programs should be a priority. While similar weight loss can be achieved with calorie-restricted diets, there are added benefits to chronic disease prevention associated with a healthful dietary pattern.” This highlights the potential for Mediterranean dietary patterns to offer not only weight loss benefits but also long-term health improvements.

The authors of the study pointed out that individuals residing in the Southeastern U.S. experience elevated rates of chronic diseases, including diabetes, cardiovascular disease, and stroke. These health issues are significantly influenced by lifestyle factors, particularly poor dietary habits. Prior research has indicated that dietary patterns prioritizing high-quality fats (found in nuts, seeds, and vegetable oils) and high-quality carbohydrates (such as whole grains, fruits, and vegetables) may more effectively reduce the risk of cardiovascular diseases compared to conventional low-fat weight loss diets.

Implications for Public Health

The findings from the DELISH study suggest that adopting a Mediterranean-style dietary approach could be a viable strategy for addressing the high prevalence of chronic diseases in the Southeast. Given the region’s unique food culture and dietary preferences, this tailored approach may encourage greater adherence and longer-term success in weight management among participants.

This research underscores the significance of culturally relevant dietary interventions in public health strategies aimed at reducing obesity and improving overall diet quality. As the U.S. grapples with rising obesity rates and related health issues, studies like DELISH provide valuable insights into effective dietary patterns that can be adapted to meet the needs of diverse populations.

Conclusion

The DELISH study offers an important perspective on dietary interventions that are both culturally appropriate and effective in promoting health and wellness. By focusing on a Mediterranean-style diet adapted for the Southeast, the researchers have highlighted a potential pathway toward improving health outcomes in a region that has long struggled with high rates of chronic disease. As public health officials and policymakers seek effective strategies to combat obesity and related health issues, findings from this study may inform future dietary guidelines and health promotion initiatives.