the invention relates to a tri - enzyme hydrolysis method for preparing an oligo - saccharide enhanced oat - based drink product useful in lowering cholesterol , triglyceride , blood sugar and improving gastrointestinal function which comprises not only oat β - glucan and but also a higher amount of isomalto - oligosacchride . in accordance with the invention , whole grains of oats are micronized to an average particle size of 100 microns prior to enzyme treatments , and a product of creamy milk - like texture is obtained without filtration so that nutrients of the whole grains of oats are retained . this invention enhances the value of oat - based processing to yield additional health - associated content and illness prevention efficacy that are beyond the potential of oats per se .