“We found that blood type made no difference,” says study author Neal Barnard, MD, president of the Physicians Committee. They considered whether the effects of a plant-based dietary intervention on body weight, blood lipids, and glycemic control are associated with ABO blood type. The “blood type diet” recommends a mainly plant-based diet for those with blood type A, while it recommends a diet heavy in meat for people with blood type O. To consider a potential connection between blood type and diet, researchers took the additional step of conducting a secondary analysis among intervention-group participants of the 16-week randomized clinical trial. The key finding is that a plant-based diet ramps up metabolism as measured by an increase in after-meal calorie burn of 18.7%, on average, for the intervention group over the control. Participants in the intervention group followed a low-fat, plant-based diet. 30. That trial randomly assigned overweight participants with no history of diabetes to an intervention or control group on a 1:1 ratio for 16 weeks. This new study is based on a randomized control trial whose main findings were published in JAMA Network Open on Nov. WASHINGTON-A study published in the Journal of the Academy of Nutrition and Dietetics by researchers with the Physicians Committee for Responsible Medicine-a nonprofit of 12,000 doctors-debunks the “blood type diet” by finding that blood type was not associated with the effects of a plant-based diet on body weight, body fat, plasma lipid concentrations, or glycemic control.
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