BDNF and food allergy: In contrast, less frequently addressed topics, which represent potential areas for future research, include “alanyl-glutamine”, “adalimumab”, “acupuncture”, “acetic acid”, “5-HT”, “Vitamin D”, “tryptophan”, “serotonin”, “tricellulin”, “Toll-like receptor”, “NLRP3 inflammasome”, “cytokines”, “miR-144”, “low-FODMAP diet”, “food allergy”, “eosinophil”, “BDNF”, “aquaporin”, and “claudin”.