TLR2 and food allergy: However, there are studies in which food allergies are characterized by a decrease in the number of representatives of Bifidobacteriaceae and Ruminococcaceae [59]; additionally, some studies have shown that both food allergies and/or atopic dermatitis are characterized by a decrease in the number of representatives of Bifidobacteriaceae and Ruminococcaceae [60,61], which is associated with increased TLR2-induced reactions of IL-6 and TNF-α [61].