 Ageing of the population and loss of autonomy expose to major consequences in terms of treatment charges and need for hospitalisation. Malnutrition has a key prognostic value, that worsen the prognosis of the primary disease; the length of hospital stay and the incidence of complications are related to nutritional status Correia 2003, Pichard 2004, Schneider 2004. Several large scale studies at Rouen University Hospital, in 1998 and 2001, have revealed on more than 1000 patients mid age 71 years that malnutrition prevalence ranged of 35 to 38, one third of which is severe Jusserand 2000, Delaire 2002. Malnutrition increases the risk of complications Naber 1997, Correia 2003, including muscle mass depletion, decrease of immune function and delayed wound healing. The main consequence of malnutrition is increased infectious morbidity and post operative mortality for the weakest patients. Increased length of hospital stay and rehabilitation duration also results in increased medicals and social burden, in particular in the elderly patients. 