The authors are participants of the Food and Agriculture COST (European Cooperation in Science and Technology) Action FA1005 ‘‘Improving health properties of food by sharing our knowledge on the digestive process (INFOGEST)’’ http://www.cost.esf.org/domains_actions/fa/Actions/FA1005. ; The impact of heat-induced aggregation on the extent of ovalbumin digestion and the nature of peptides released was investigated using an in vitro digestion model. The extent of hydrolysis, estimated by the disappearance of intact ovalbumin and the appearance of soluble peptides, was greater for the linear aggregates as compared to the spherical aggregates. The latter result may be due to differences in the surface area to volume ratio of the aggregates, or the degree of unfolding of the proteins during aggregate preparation. Peptide identification using LC–MS/MS highlighted that ovalbumin aggregation rendered a number of peptide bonds accessible to digestive proteases which were not accessible in native ovalbumin. Moreover, the peptide bonds that were cleaved appeared to be specific depending on the morphology of the aggregates. This work illustrates the links existing between food structure and their breakdown during the digestive process. Such quantitative and qualitative differences may have important nutritional consequences.