[FESNAD-SEEDO consensus summary: evidence-based nutritional recommendations for the prevention and treatment of overweight and obesity in adults].

This paper is a summary of the Spanish Federation of Nutrition, Food and Dietetics Associations (FESNAD) and the Spanish Association for the Study of Obesity (SEEDO) consensus document on the role of diet in prevention and treatment of overweight and obesity. To prepare this document, and in order to achieve the maximum evidence level possible, a systematic review was made of all medical literature published between January 1, 1996 and January 31, 2011 (15 years). The obtained findings were catalogued by evidence level following the Scottish Intercollegiate Guidelines Network system, and recommendations were produced based on data collected.