Marrow transplant recipients present numerous problems of gastrintestinais that wich intefere with adequate oral intake. Previous studies showed the effectiveness of laminar air flow isolation, sterile diet, descontamination with oral antibiotcs and skin cleasing in prevention infections. The literature recommend the food sterilization by autoclave, irradiation or oven baking. This work purpose the microwave sterilization because it's a very quickly process, security and don't alter the flavour and aspect of food