Well planned PBDs are associated with a healthy nutritional profile and a reduced risk of chronic diseases. However some of the supporting evidence for this can be confounded by the fact that vegetarians and vegans tend to make other healthy lifestyle choices beyond diet.
Animal-based foods are also nutritious, and cutting out food groups runs the risk of nutritional deficiency and related health problems.
Although most people would benefit from eating a more PBD, many of the benefits can be achieved by eating more plant-based products and less animal-based products; without avoiding animal-based products all together.
Therefore a ‘flexitarian’ approach may be a more realistic and balanced way for many people to adopt a PBD.