What Not to Eat With A+ Blood Type, According to Diet Theory
                                
                                
                                •
                                
                                
                        
                                    
                                    5 min read                                
                            
                                First popularized by naturopath Peter J. D'Adamo in his 1996 book, the blood type diet suggests that people with A+ blood should primarily follow a vegetarian plan, avoiding red meat and dairy. However, a 2013 systematic review published in the *American Journal of Clinical Nutrition* found no evidence to support the claimed health benefits of blood type diets.