Leaf proteins could potentially form a major protein source for food application. Leaves from several crops have been considered depending on their protein content, regional availability, social needs and current uses (e.g. alfalfa, spinach, grass, cassava, moringa, tobacco). Other sources include leaves that are available as by-products from certain crops on large scale (e.g. cassava, barley, broccoli, sugar beet). Despite many decades of leaf protein study and the broad portfolio of suitable crops, the existing extraction processes have not reached industrial production for human food application yet. An important reason could be the focus on soluble proteins, thereby neglecting the great potential of the other proteins present in leaves. It is therefore important to further explore how the remaining proteins can be utilised as well, which is the purpose of this study.