In September 2018 researchers from the USA published the results of their study to assess the role of changes in carbohydrate intake on body composition and insulin resistance in overweight individuals. A total of 75 individuals were involved in the study, with 38 consuming a plant-based high-carbohydrate, low-fat (vegan) diet and 37 maintaining their current diet. Body composition and insulin resistance was assessed at the start of the study and again after a 16-week period. Results showed that weight decreased significantly in the vegan group as did insulin resistance. A further analysis revealed that the increase in both carbohydrate and fibre intake resulted in a reduction in BMI, fat mass and amount of visceral fat.
Kahleova H et al. A Plant-Based High-Carbohydrate, Low-Fat Diet in Overweight Individuals in a 16-Week Randomized Clinical Trial: The Role of Carbohydrates. Nutrients. 2018 Sep 14;10(9). pii: E1302.