In last decades, a change in dietary habits has been observed in industrialized countries characterized by a drastic increase in the consumption of ultra-processed foods (UPF, Ultra-Processed Foods). As defined by the NOVA classification, UPFs are industrial formulations of food substances added with colourings, flavourings, emulsifiers, thickeners and other additives. Among the main compounds of UPFs are the advanced glycation end-products (AGEs). Increasing evidence suggests an association between dietary exposure to AGEs and the development of chronic non-communicable diseases, such as obesity and allergies, in the general population, through increased oxidative stress and inflammation. Preliminary evidence suggests that a maternal diet rich in AGEs during pregnancy and lactation could negatively influence the composition of breast milk and have a negative impact on the infants health. However, data regarding the presence of derivatives of UPFs in breast milk are not available. The UFIM (Ultraprocessed Foods In Breast Milk) study aims at evaluate the presence of UPFs-derivatives compounds in breast milk.