Most participants saw improvements, it’s just that no one group saw greater results for cholesterol, BMI, fasting blood sugar, HbA1c, or weight loss than another due to blood type. Barnard is a staunch advocate of plant based diets, and his blood type diet study shows no enhanced benefit for blood type A on a low-fat vegan diet vs. Barnard’s recent study follows in the same vein as the 2013 analysis I discuss above. Dr D’Adamo refutes this study on his site but once again, in a non peer review format. This study was considered the nail in the coffin of the blood type diet. Rather, it is just an effect of following a traditional “healthy” diet. So, while a positive effect from following the low meat high fruit and vegetable diet was observed, this was not associated with any particular blood group. 3 Again the paper has a lot of detail and is perhaps again summed up best by the authors: Our findings show that adherence to certain ‘Blood-Type’ diets is associated with a favorable profile for certain cardiometabolic risk factors in young adults, but these associations were not related to an individual’s ABO blood group. This systematic review was followed up by a direct study investigating blood type diet and its impact on cardiometabolic risk factors in 1,455 individuals. The paper itself is quite difficult to follow so I’ll just take this quote from the authors: None of the studies showed an association between ABO blood type diets and health-related outcomes. 1 After screening 1,415 studies, they identified 16 possible targets, which they further refined down to a single study of interest. In 2013, a group of researchers studied blood type diets comprehensively. In the early 2000’s, diets based on your ABO blood type were all the rage, with the D’Adamo diet being one of the most popular versions. Although, as I will discuss in this post, there are a few narrow redeeming qualities to this much maligned fad diet. Yes, the blood type diet is largely thin on evidence, especially after a study by plant based doctor Neil Barnard showed changes in weight, fasting blood sugar and cholesterol didn’t have anything to do with blood type in a group placed on a low-fat vegan diet. If you’re wondering whether the blood type diet has been debunked, several studies have shown a lack of efficacy for people who follow the diet looking to improve health. We get questions about the blood type diet at Gene Food because the diet claims to be able to personalize nutrition based on blood type, and people sometimes confuse it with nutrigenomic diets. Potential dietary changes based on blood type.
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