The invention discloses a preparation method of a low-GI whole grain base material rich in dietary fibers. The method comprises the following steps: step 1, extracting low-GI grain
starch; and step 2,
enzyme modification of the whole grain base material. According to the invention, 14 whole grain raw materials are screened, and low-GI
whole grains are preferably selected and compounded, so that the selection of low-GI
food industry raw materials is enriched, and the raw materials are different from single grains in the current market and are multi-grain compound base materials. The whole-grain base material not only meets the low GI requirement, but also is rich in dietary fibers and
flavonoid substances, so that the whole-grain base material has the effects of enhancing satiety, promoting intestinal tract movement, regulating gastrointestinal functions, reducing
cholesterol and glucose levels, improving vascular elasticity and promoting
insulin secretion, and can better meet various requirements in the field of functional foods.