Evaluation of predicted glycemic index in bakery/confectionary former food products and in former food based pig diet

This study evaluated the predicted glycemic index (pGI) in FFPs, and in two pig compound feeds containing or not FFPs. For this purpose, 6 samples of FFPs and a pig compound feed were used. FFPs were based on bakery and confectionary ex-food, while the pig compound feed was formulated substituting 30% of cereals with FFPs (feedFFP30). All samples were analyzed using an in vitro based on the Englyst-assay that simulates gastric and small intestinal digestion, and that has been proposed for determine hydrolysis index (HI) and predict the glycemic index (pGI) of cereal-based foods entering pig diets. Corn meal, flaked wheat, and a conventional pig compound feed (feedCTR) were included as control feed ingredients. In the assay white bread was used as reference material. Results obtained distinguished two main group of samples, namely: Low HI sample with HI lower than 100 including corn meal, feedCTR, feedFFP30, flacked wheat and FFP4; and high HI samples including all the other FFPs tested. The same classification can be adopted for pGI. Thus combining HI and pGI results it can be suggested that most of the FFPs tested in the present study were characterized by a high glycemic index potential that seems linked to the starch/sugars HI. The inclusion of FFPs in a commercial compound feed, and its effect on HI and pGI merit further investigations.