Gastric cancer continues to be the second cause of cancer-related mortality in the world. Surgery is the only potentially curative therapy, although the adverse effects of surgery are considerable and include digestive symptoms, loss of appetite and malnutrition. Our study included 45 patients subjected to gastrectomy who were under treatment at our unit during 2000. The data given here refer to their first visit following surgery. The most frequent complications were diarrhoea (31%), pain (29%) and early dumping (24%). Other complications found were late dumping, nausea/vomiting and dysphagia. Anorexia appeared in 49% and 29% presented a negative attitude towards food. These complications give rise to insufficient food intake, leading to malnutrition, mainly marasmic in nature. Only 7% of the patients were normonourished, with 86% presenting slight or moderate malnutrition and 7% severe malnutrition. The mean Body Mass Index (BMI) of these patients was 20 +/- 3 kg/m2. The most frequent analytical alterations were anaemia with ferropenia and b12 deficit, and a reduction in the levels of zinc and retinol transporting protein. Many patients had impaired quality of life; 43% did not leave home and only 13% were able to work. Three groups were established depending on the time that had passed since the gastrectomy was performed before the first nutritional assessment (less than 3 months, from three months to a year, and over one year), without significant differences being found in any of the parameters studied. In this article we include recommendations for the nutritional handling and treatment of patients following gastrectomy.