Producing meat analogue instead of real meat is one effective way to reduce carbon emissions and improve animal welfare. Calcium caseinate (CaCas) is a prominent candidate for this purpose. When the powder is mixed with water, it forms a dense gel. This gel can be transformed into fibrous structure under shear and heat. Depending on drying methods and solvent used, spray-dried CaCas with H2O gives pronounced fibrous structure and roller-dried CaCas with D2O give some fibrous structure. We suspect the morphology of the powder and the hydrogen bond both play a role in the structure. The aim of this proposal is to use QENS to study the hydration behavior of the 2 protein powders at different hydration levels using both H2O and D2O. We also hope to disentangle the behavior of hydrogen from the protein and from the water molecule by comparing the H2O and D2O results.