Weight loss with a modified Mediterranean-type diet using fat modification: a randomized controlled trial

Area of Science:

• Nutrition Science
• Dietary Interventions
• Obesity Research

Background:

• Traditional Mediterranean diets rich in olive oil and nuts show efficacy in weight management and cardiovascular disease prevention.
• Adaptation of Mediterranean diets may be challenging for diverse populations.
• A modified approach using canola oil, walnuts, and controlled sweet snacks was developed for a German population.

Purpose of the Study:

• To evaluate the effectiveness of a modified Mediterranean-type diet for weight management.
• To assess the impact of fat modification (canola oil, walnuts) on cardiovascular risk factors.
• To determine the long-term adherence and efficacy of a self-help dietary intervention.

Main Methods:

• A 12-month randomized waiting-list control study involving overweight/grade 1 obese subjects.
• Intervention group (n=100) received a 12-week self-help modified Mediterranean diet, followed by maintenance training.
• Control group (n=112) received no intervention during the initial 12 weeks.

Main Results:

• Significant weight loss (5.2 kg), BMI reduction (-1.8 kg/m²), and waist circumference decrease (-4.7 cm) in the intervention group after 12 weeks (P ≤ 0.0001).
• Improvements in triglycerides, total cholesterol, and LDL cholesterol were observed in the intervention group.
• After 12 months, pooled data showed a weight loss of 4.2 kg, with dropout rates of 44% (intervention) and 53% (control).

Conclusions:

• The modified Mediterranean diet, including canola oil, walnuts, and two daily sweet snacks, is effective for weight management in a self-help setting.
• Fat modification with canola oil and walnuts positively impacted blood lipids over 12 months.
• The intervention shows promise for managing overweight and obesity in a real-world, self-directed context.