A link between ABO blood group and diet was proposed by naturopath Peter D’Adamo in his 1996 book ‘‘Eat Right 4 Your Type’’ which sold over 7 million copies. The Blood-Type diets have certainly generated widespread public interest with numerous anecdotal reports of success.
The theory postulated by D’Adamo was that a person’s ABO blood group correlates with a specific diet based upon our ancestors dietary habits and the Blood-Type diet advises individuals to eat according to their ABO blood group to improve their health and decrease risk of chronic diseases such as cardiovascular disease.
Based on this Blood-Type theory, the optimal diet proposed for blood group O is a one high in animal protein, whereas for those with group A it is a vegetarian diet, for blood group B a high dairy intake and finally for individuals with an AB blood group, a diet that is a combination of dairy and vegetarian (lacto-vegetarian).
The anecdotal reports of successful weight loss are explainable by the fact that all the Blood-Type diets are fairly prudent healthy diets and if they are lower in calories or carbs compared to an individual’s prior diet then they are likely to experience positive health outcomes.
The scientific evidence says that these health outcomes are INDEPENDENT of the person’s blood type, hence research findings do not support the ‘Blood-Type’ diet hypothesis. This was the conclusion reached in a large Canadian study carried out on 1455 subjects published in 2014 in PloS One (ABO Genotype, ‘Blood-Type’ Diet and Cardiometabolic Risk Factors, Jingzhou Wang et al.). In 2013 a paper by Cusack et al. in the American Journal of Clinical Nutrition, which was a systematic review of published studies, concluded that “No evidence currently exists to validate the purported health benefits of blood type diets.”
Therefore the answer is yes, because if you look at the diet purported for blood group O it is a ‘paleo’ diet rich in meat and animal fats i.e. it is a low-carb diet. This would benefit most people who are overweight independent of their blood type.