Diseases Brain Nutritional aspects Carbohydrates Metabolism Prevention Energy metabolism Cognition and culture Culture Gastrointestinal system Gluten-free diet Microbiology Neurophysiology Nutrition Physiological effect Spanish language materials Caloric content Diet therapy Dietary supplements Food Ketogenic diet Low-carbohydrate diet Memory disorders Mental healing Nervous system Neurosciences Nootropic agents Prehistoric peoples Reducing diets Shamanism