Foods that had little structural resilience under digestion conditions. These foods were based on extensively disrupted grains that had been cooked and processed into food prod- ucts without the development of secondary structure that could persist in the hydrating and digestive conditions of the gut. Such foods are of typically cellular structure achieved by leavening (breads and biscuits) and puffing by release of gelatinised starch from high pressure (ricies), or are thin crushed structures (cornflakes), and structures con- taining a high proportion of soluble material such as sugars that can hydrate and dissolve immediately without diges- tion, including many processed breakfast cereals and biscuits.