The treatment of the tumors of the head and the neck comes along very often with a loss of weight (17.4 % after one year of radiotherapy according to the study of Larsson et al.) which varies with the chosen treatment, and shows a major risk at the patients whose therapeutic sequence involves a radiotherapy. The irradiation of the upper aerodigestive tract is source of aftereffects and late complications: xerostomia, oedemas of mucous membranes.