Metabolizable energy value of resistant maltodextrin

Abstract

Resistant maltodextrin (RM) is a soluble dietary fiber with desirable functional properties that is resistant to digestion by human enzymes but fermentable. To determine the metabolizable energy (ME) value of RM, a randomized, controlled dose‐response trial was conducted. Each subject (n=14 healthy males) was assigned to a treatment sequence that consisted of 3 treatments with controlled diets: a control diet (0 g/d RM + 50 g/d maltodextrin [MD]) and 2 levels of dietary RM (25 g/d RM + 25 g/d MD and 50 g/d RM + 0 g/d MD). Daily, subjects received their treatment divided into 2 doses, 1 at breakfast and 1 at dinner. After a 14‐d adaptation to each treatment, excreta were collected for a 7‐d period. Fecal amount of dry mass, energy, nitrogen, RM, and total carbohydrate increased with dose of RM (P<0.0001) and total fecal bacteria number also increased. Fat excretion did not differ among treatments. The energy value of RM based on the replacement of 25 g/d MD for RM ranged from 0.1 kcal/g to 4.1 kcal/g with a mean value of 2.0 kcal/g, and the energy value of RM based on the replacement of 50 g/d of MD for RM ranged from 1.8 to 3.9 kcal/g with a mean value of 2.5 kcal/g. Thus, at the higher intake of resistant MD, the ME value of RM is higher than at the lower intake. The variability of the ME value is lower at the higher intake of RM compared to the lower intake (SD of 0.7 vs. 1.2, respectively). Supported by USDA and Matsutani Chemical Industry Co., Ltd.