Popular diets and nutritional assessment in the management of irritable bowel syndrome in inflammatory bowel disease: an overview of current evidence.

There is increasing interest in using popular diets to manage inflammatory bowel diseases (IBD), such as ulcerative colitis (UC) and Crohn's disease (CD). These conditions are often associated with nutritional deficiencies, protein-energy malnutrition, micronutrient malnutrition, altered body composition, and sarcopenia. While dietary interventions can be supportive in treating intestinal symptoms of adult IBD patients, it's important to note that current guidelines from major scientific societies do not recommend any specific dietary interventions for this purpose. This review aims to provide a summary of the current evidence on dietary-nutritional management for patients with IBD, specifically in cases where the disease appears to be in remission, but the patient continues to experience irritable bowel syndrome (IBS) symptoms or functional gastrointestinal symptoms. We focus on vital aspects in this regard, such as malnutrition and sarcopenia definitions, screening and nutritional assessment. We then discuss in detail the most popular diets used for IBD management over the years, characterizing each one in terms of effects on gut inflammation, IBS-like symptoms, and potential risks of malnutrition. These diets include Low-FODMAP diet, Gluten-free diet as well as Mediterranean diet and plant-based diet. To date, current evidence does not conclusively establish the optimal diet for the topic of this review, suggesting that personalized dietary approaches may be the best strategy.