The rice starch following microwave cooking with storage showed more slowly digestible starch and a lower digestion rate than did the conventionally treated counterpart. The underlying mechanism was interpreted by inspecting starch multi-level structural evolutions during digestion. Accompanying digestion, not only were starch matrices digested, leading to porous substrate and probably less polymorphs and nanoscale orders, but also starch chain reassembly occurred, causing A to B crystalline transform for untreated starch and formation of new m...