The trial found that a vegan diet led to significant improvements in LDL-C levels, fasting insulin, and body weight compared to an omnivorous diet in healthy adult identical twins over eight weeks. Despite lower dietary satisfaction among vegans, the study supports the cardiometabolic benefits of a vegan diet. The study’s unique aspect was using identical twins to control for genetic and environmental factors, thereby attributing observed health differences to the diet itself. It suggests that clinicians might recommend plant-based diets to reduce cardiometabolic risks and align with environmental benefits.