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Through the senses, consumers can subjectively detect properties in food. However, other qualities such as long‐term health benefits of food that cannot be easily detected. A deep knowledge of cereal grain structure and how it is modified by processing is necessary to understand the physical and health properties of the different cereal products. This chapter focuses on the microstructure, at different levels, of cereal grains and their products. The structure of the grain is briefly overviewed and followed by the effect of processing on the structure of different food products. Based on the microstructure of the final product, three groups are distinguished: rolled cereals and porridge, protein network‐based products and starch network‐based products. This different organization is important for food production and technological aspects. The impact on the health‐related aspects of the product is currently investigated.