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Before, during and after physical activity, hydration is a limiting factor in athletic performance. Therefore, adequate hydration provides benefits for health and performance of athletes. Besides, hydration is associated to the intake of carbohydrates, protein, sodium, caffeine and other substances by different dietary aids, during the training and/or competition by athletes. These requirements have led to the development of different products by the food industry, to cover the nutritional needs of athletes. Currently in the European context, the legal framework for the development of products, substances and health claims concerning to sport products is incomplete and scarce. Under these conditions, there are many products with different ingredients out of European Food Safety Authority (EFSA) control where claims are wrong due to no robust scientific evidence and it can be dangerous for the health. Further scientific evidence should be constructed by new clinical trials in order to assist to the Experts Commitees at EFSA for obtaining robust scientific opinions concerning to the functional foods and the individual ingredients for sport population.Antes, durante y después de la actividad física, la hidratación es un factor limitante en el rendimiento deportivo. Por lo tanto, una adecuada hidratación proporciona beneficios para la salud y el rendimiento de los deportista. Además, la hidratación se asocia a la ingesta de hidratos de carbono, proteínas, sodio, cafeína y otras sustancias durante el entrenamiento y/o competición de los deportistas. Estos requisitos han llevado al desarrollo de diferentes productos por parte de la industria alimentaria, para cubrir las necesidades nutricionales de los deportistas. Actualmente en el contexto europeo, el marco legal para el desarrollo de productos, sustancias y declaraciones nutricionales y de propiedades saludables relativas a productos deportivos, es incompleta y escasa. Hay muchos productos con diferentes ingredientes controlados por la Agencia Europea de Seguridad Alimentaria (EFSA), los cuales poseen declaraciones nutricionales y de propiedades saludables erróneas, debido a la falta o escasa evidencia científica, resultado peligroso para la salud. Se necesita mayor evidencia científica obtendia a través de nuevos ensayos clínicos con el fin de ayudar a los Comités de expertos de la EFSA para la obtención de dictámenes científicos sólidos relativos a los alimentos funcionales y los ingredientes individuales para la población deportiva.

The needs of water and electrolytes are quite variants, depending on age, physiological or environmental conditions. In most long-term sports, usual weight loss of 3-6%, affect in athletic performance. The effects of a 6% dehydration could be improved with individualized diet-specific nutritional strategies and allow only a 2-3% dehydration, which affect metabolic efficiency but will not risk the health. On the contrary, hyperhydration can be dangerous and is associated with hyponatremia that can cause cerebral edema or respiratory failure. Sports drinks should moisturize, providing minerals and carbohydrates and increase the absorption of water by an ideal combination of salts and sugars. Therefore, it is important to provide correct hydration -protocols before, during and after physical activity, as well as know possible limitations of the sport.