Glycemic Index of Traditional Tarhana Varieties from Türkiye: An In Vitro Study

Year 2025, Volume: 10 Issue: 3, 234 - 238, 31.12.2025

Emine Dinçer , Melisa Sayın

Abstract

Tarhana is a traditional fermented cereal–yogurt food widely consumed in Türkiye. It is often described as a low-glycemic index (GI) food, but this belief is based mostly on secondary sources, and direct evidence is limited. This study aimed to evaluate the in vitro GI of different tarhana varieties produced in Türkiye. Seven types—Konya flour, Beyşehir crisp, Maraş, Elbistan, grape, cornelian cherry, and Muğla Göce tarhana—were analyzed using the Englyst hydrolysis method with white bread as the reference. Hydrolysis index (HI) values were calculated and converted to GI using established equations. GI values ranged from 57.25 ± 2.22 to 95.09 ± 0.70, showing clear variation among samples. Konya flour tarhana was classified as low GI, cornelian cherry tarhana as medium GI, and the other five varieties, including grape, Elbistan, and Maraş tarhana, as high GI. These findings challenge the common belief that tarhana is always a low-GI food. They also show that its glycemic response depends strongly on ingredients and processing methods. Although tarhana is nutritionally valuable, some types may impose a high glycemic load. This is especially important for individuals who need to control blood glucose, such as those with diabetes or metabolic syndrome. Because this study was conducted in vitro, further in vivo research is required to confirm the results and guide dietary recommendations.

Keywords

Blood glucose , Cereal-based foods , Fermented foods , Glycemic index , Tarhana

References

• Aksoydan, E. (2005). Yaşlılık ve beslenme. Ankara: Burgaz Matbaası.
• Altundağ, Ö. Ö., Kenger, E. B., & Ulu, E. K. (2020). Farklı tarhana türlerinin sağlık yönünden değerlendirilmesine yönelik bir çalışma. Sağlık Akademisi Kastamonu 5 (2), 143–157. https://doi.org/10.25279/sak.458051
• Aribas, M., Kahraman, K., & Koksel, H. (2020). In vitro glycemic index, bile acid binding capacity and mineral bioavailability of spaghetti supplemented with resistant starch type 4 and wheat bran. Journal of Functional Foods, 65, 103778. https://doi.org/10.1016/j.jff.2020.103778
• Baysal, A. (2009, Mayıs 27–29). Geleneksel gıdaların sağlık üzerine etkileri. II. Geleneksel Gıdalar Sempozyumu (ss. 5–6). Van, Türkiye.
• Coşkun, F. (2014). Tarhananın tarihi ve Türkiye’de tarhana çeşitleri. Gıda Teknolojileri Elektronik Dergisi, 9(3), 69-79.
• Çekal, N., & Aslan, B. (2017). Gastronomik Bir Değer Olarak Tarhana ve Coğrafi İşaretlemede Tarhananın Yeri ve Önemi. Güncel Turizm Araştırmaları Dergisi, 1(2), 124-135.
• Daglioǧlu, O. (2000), Tarhana as a traditional Turkish fermented cereal food. Its recipe, production and composition. Nahrung, 44, 85-88. https://doi.org/10.1002/(SICI)1521-3803(20000301)44:2<85::AID-FOOD85>3.0.CO;2-H
• Englyst, H. N., Veenstra, J., & Hudson, G. J. (1996). Measurement of rapidly available glucose (RAG) in plant foods: A potential in vitro predictor of the glycaemic response. The British Journal of Nutrition, 75(3), 327–337. https://doi.org/10.1079/BJN19960137
• Erbaş, M., Certel, M., & Uslu, M. K. (2005). Microbiological and chemical properties of Tarhana during fermentation and storage as wet—sensorial properties of Tarhana soup. LWT-Food Science and Technology, 38(4), 409-416. https://doi.org/10.1016/j.lwt.2004.06.009
• Goñi, I., Garcia-Diz, L., Mañas, E., & Saura-Calixto, F. (1996). Analysis of resistant starch: a method for foods and food products. Food Chemistry, 56(4), 445-449. https://doi.org/10.1016/0308-8146(95)00222-7
• İstek, Ö., Tomar, O., & Çağlar, A. (2021). Orman meyveli tarhananın fonksiyonel özellikleri. Avrupa Bilim ve Teknoloji Dergisi, (22), 118-127. https://doi.org/10.31590/ejosat.848163
• Jenkins, D. J., Willett, W. C., Yusuf, S., Hu, F. B., Glenn, A. J., Liu, S., ... & Yang, W. (2024). Association of glycaemic index and glycaemic load with type 2 diabetes, cardiovascular disease, cancer, and all-cause mortality: a meta-analysis of mega cohorts of more than 100 000 participants. The Lancet Diabetes & Endocrinology, 12(2), 107-118. https://doi.org/10.1016/S2213-8587(23)00344-3
• Kadam, A., Ozkan, K., Du, P., Koksel, H., Sagdic, O., & Koksel, F. (2025). Impact of Pea Protein Isolate Enrichment on the Nutritional, Functional, and Glycemic Properties of Tarhana. Plant Foods for Human Nutrition, 80(1), 30. https://doi.org/10.1007/s11130-024-01281-9
• Karahan, A. M., Akın, M. B., & Köten, M. (2024). Fonksiyonel Tarhana Üretiminde Yeni Yaklaşimlar. ADYUTAYAM Dergisi, 12(2), 122-135.
• Koksel, H., Tekin-Cakmak, Z. H., Ozkan, K., Pekacar, Z., Oruc, S., Kahraman, K., ... & Sestili, F. (2024). A Novel high-amylose wheat-based functional cereal soup (tarhana) with low glycemic index and high resistant starch. Journal of Cereal Science, 117, 103911. https://doi.org/10.1016/j.jcs.2024.103911
• Koseoglu, S. Z. A., & Çelikel, S. (2021). In vitro digestibility and predicted glycemic index of commonly consumed some Turkish traditional foods. Food Science and Technology, 42, e09421. https://doi.org/10.1590/fst.09421
• Ozdemir, S., Gocmen, D., & Yildirim Kumral, A. (2007). A Traditional Turkish Fermented Cereal Food: Tarhana. Food Reviews International, 23(2), 107–121. https://doi.org/10.1080/87559120701224923
• Özbey, Z., & Köşker, H. (2021). Türk Mutfak Kültüründe Çorba ve Coğrafi İşaretli Çorbalar Üzerine Bir Değerlendirme. Gastroia: Journal of Gastronomy And Travel Research, 5(3), 471-489. https://doi.org/10.32958/gastoria.956548
• Özçelik, A. Ö., & Özdoğan, Y. (2007, Eylül 10–15). Tarhananın Türk beslenme kültüründeki yeri ve önemi. In 38. ICANAS Uluslararası Asya ve Kuzey Afrika Çalışmaları Kongresi (ss. 1025–1040). Ankara, Türkiye.
• Simsek, S., Martinez, M. O., Daglioglu, O., Guner, K. G., & Gecgel, U. (2014). Physicochemical properties of starch from a cereal-based fermented food (tarhana). Journal of Nutrition & Food Sciences, 4(2), 1. http://dx.doi.org/10.4172/2155-9600.1000263
• Şahin, N., Cingöz, A., & Sayaslan, A. (2025). Physical, nutritional, and bioactive components, in vitro starch digestibility, and textural and organoleptic properties of Beyşehir tarhana with various oleaster parts. Cereal Chemistry, 102(1), 157-166. https://doi.org/10.1002/cche.10853
• Şı̇mşeklı̇, N., & Doğan I. S. (2015). Traditional and Functional Fermented Product: Maras Tarhana. Journal of the Institute of Science and Technology, 5(4), 33-40.
• Turkish Standards Institution. (2004). TS 2282:2004 Tarhana. Turkish Standards Institution.
• Venn, B. J., & Green, T. J. (2007). Glycemic index and glycemic load: measurement issues and their effect on diet–disease relationships. European Journal of Clinical Nutrition, 61(1), 122-131.https://doi.org/10.1038/sj.ejcn.1602942
• Wolever, T. M., Vorster, H. H., Björck, I., Brand-Miller, J., Brighenti, F., Mann, J. I., ... & Venter, C. (2003). Determination of the glycaemic index of foods: interlaboratory study. European Journal of Clinical Nutrition, 57(3), 475-482.https://doi.org/10.1038/sj.ejcn.1601551
• Yaralı, K., & İnanç, A. L. (2023). Comparison of novel and conventional techniques for tarhana production. Akademik Gıda, 21(1), 27-37. https://doi.org/10.24323/akademik-gida.1273998
• Yıldırım, Ç., & Güzeler, N. (2016). Tarhana cipsi. Nevşehir Bilim ve Teknoloji Dergisi, 5, 1-8. https://doi.org/10.17100/nevbiltek.210953