Formulation of Fibre-Fortified Functional Chocolate with Reduced Glycemic Impact for Type-II Diabetes Management

Abstract

Type-II diabetes mellitus (T2DM) is characterized by chronic hyperglycemia and insulin resistance, and dietary modification remains a cornerstone of glycemic management. Functional foods that combine high consumer acceptability with metabolic benefits are increasingly explored for improving long-term adherence. Chocolate is widely consumed but is often avoided by individuals with diabetes due to added sugar and high glycemic impact. The present research paper describes the development of a functional chocolate enriched with dietary fibre aimed at improving postprandial glycemic control in T2DM. Fibre sources such as inulin, resistant starch, oat ?-glucan, and psyllium were incorporated into chocolate formulations by partially replacing sugar and/or fat while maintaining desirable sensory quality. Formulations were evaluated for physicochemical characteristics (moisture, texture, melting behaviour, colour), nutritional profile (total dietary fibre, available carbohydrates), predicted glycemic impact, and sensory acceptability. The developed fibre-enriched chocolate showed increased total dietary fibre, reduced available carbohydrates, improved satiety potential, and a lower predicted glycemic response compared with conventional chocolate, while maintaining acceptable sensory attributes. The study supports the feasibility of fibre-enriched chocolate as a palatable functional food option for glycemic control in T2DM, with further clinical validation recommended.

Introduction

Type-II Diabetes Mellitus (T2DM) is a major global health concern associated with unhealthy diets, obesity, and sedentary lifestyles. Persistent high blood glucose levels increase the risk of complications such as cardiovascular disease, kidney damage, neuropathy, and retinopathy. Medical nutrition therapy emphasizes the consumption of high-fiber, low-glycemic foods to improve blood glucose regulation. Dietary fibers such as inulin, resistant starch, β-glucan, and psyllium help slow glucose absorption, improve insulin sensitivity, and support gut health. This study developed a dietary fiber-enriched functional chocolate as a healthier alternative to conventional chocolate, aiming to reduce glycemic impact while maintaining desirable sensory qualities.

The study formulated several chocolate variants enriched with different fiber sources and low-glycemic sweeteners. Standard chocolate manufacturing processes, including mixing, refining, conching, tempering, and molding, were used. Physicochemical properties, nutritional composition, texture, viscosity, and sensory acceptability were evaluated and compared with conventional chocolate. Statistical analyses were performed using ANOVA and post-hoc tests to determine significant differences among formulations.

Results showed that fiber-enriched chocolates contained three to four times more dietary fiber, lower available carbohydrates, and slightly reduced fat content than the control chocolate. Moisture, ash, hardness, and viscosity increased due to the water-binding and gel-forming properties of dietary fibers, especially psyllium and β-glucan. Among the formulations, inulin and resistant starch provided the best balance between nutritional improvement, processing characteristics, and product quality, while β-glucan and psyllium offered greater glycemic benefits but increased viscosity and firmness.

Sensory evaluation demonstrated that all functional chocolates remained highly acceptable, with average scores above 7 on a 9-point hedonic scale. Although conventional chocolate received the highest ratings, chocolates enriched with inulin and resistant starch closely matched the control in appearance, aroma, sweetness, texture, mouthfeel, and overall acceptability. Psyllium and β-glucan formulations showed slightly lower sensory scores due to increased firmness and reduced melt-in-mouth characteristics but were still well accepted by consumers.

Predicted glycemic response analysis revealed significant nutritional advantages of fiber-enriched chocolates. Functional formulations exhibited lower rapidly digestible carbohydrates, hydrolysis index, predicted glycemic index (pGI), and glycemic load compared with conventional chocolate. Psyllium and β-glucan chocolates achieved the greatest reduction in glycemic response, placing them in the low-glycemic index category suitable for individuals with T2DM. Overall, the study concludes that dietary fiber enrichment can successfully transform chocolate into a functional, low-glycemic food that supports blood glucose management while maintaining good sensory quality, with inulin and resistant starch emerging as the most promising ingredients for practical product development.

Conclusion

Functional chocolate enriched with dietary fibre can be successfully developed with improved nutritional profile, reduced available carbohydrates, and lower predicted glycemic impact while maintaining acceptable sensory quality. Among tested options, inulin and resistant starch (alone or in combination) showed the best balance of technological performance and acceptability, whereas ?-glucan and psyllium required lower inclusion levels due to viscosity effects. The developed product has potential as a supportive dietary option for glycemic control in Type-II diabetes mellitus. Future work should include clinical trials assessing postprandial glucose response, long-term HbA1c impact, and gut microbiome outcomes.

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Copyright

Copyright © 2026 Anmayee Nanda, Monalisa Roy, Khan Farhana Mahreen, Swati Nakhale, Souvik Tewari. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.