dietotherapy
noun
                                                                                                                            
                                                            di·e·to·ther·a·py
                    
                                                                                                              
                                                                                                                                  ˌdī-ət-ō-ˈther-ə-pē  
                                                      
                                                          
            
            
               plural dietotherapies            
        
    
                                
              
          
                                                      : a branch of dietetics concerned with therapeutic uses of food and diet                                      
                
                    
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  Merriam-Webster unabridged




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