ABO genotype, ‘blood-type’ diet and cardiometabolic risk factors. Wang J, García-Bailo B, Nielsen DE, El-Sohemy A. Diet not working? Maybe its not your type. Health claims made by the blood type diet should be viewed as theoretical and not supported by scientific evidence. Evidence does not support using blood type as a basis for determining what foods to eat or avoid.The type O diet recommendations (emphasizing meat, fruits, and vegetables and limiting grains) have been associated with lower triglyceride levels, regardless of the person's blood type.Regardless of blood type, those whose eating patterns are similar to those outlined for the type A blood group (more fruit, vegetables, and grain, less meat) tend to have better cardio-metabolic (cardiovascular and metabolic) outcomes, such as lower body mass index (BMI), waist circumference, serum cholesterol and triglyceride levels (fats in the blood), and insulin resistance (when cells in the body don't respond well to the hormone insulin and have difficulty taking up glucose from the blood, requiring more insulin).
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The main findings of existing studies examining the influence of blood type on diet and health benefits include: There is a lack of high-quality studies published in peer-reviewed medical literature on the blood type diet.