Randomization to plant-based dietary approaches leads to larger short-term improvements in Dietary Inflammatory Index scores and macronutrient intake compared with diets that contain meat.

Estudio muy majo, porque no es observacional, si no de intervención y randomizado.

Del full text (si alguien lo quiere y no tiene acceso que me lo pida):

Participants randomized to follow a vegan diet had greater changes in macronutrient profile during the study with greater decreases in total fat and saturated fat and greater increases in fiber than participants following diets that included animal products. Nutrients of concern for vegan diets, such as protein, vitamin B-12, iron, and zinc, were not significantly different than the other diet groups. All groups consumed diets low in calcium, iron, vitamin D, and potassium and high in sodium. Given the greater impact on macronutrients and the DII during the short term, finding ways to provide support for adoption and maintenance of plant-based dietary approaches, such as vegan or veg diets, should be given consideration as dietary strategies for the prevention and treatment of diseases associated with inflammation, such as type 2 diabetes, cardiovascular disease, and cancer [61] and [62].
Para los que leáis que no vario la B12 en veganos, ya os adelanto que los suplementaban, tal y como explica la intervención dietética (de nuevo del full text):

All participants were required to take a multivitamin or other form of vitamin B-12 each day (because vegan diets require supplementary B-12)