Glycemic Index of Carob
A single figure often circulates on the internet about the glycemic index of carob; However, there is no single and fixed glycemic index value for carob in the scientific literature. Measured values; It varies according to the type of product (flour, snack, syrup), measurement method and the content of the food tested.
In this article, we discuss what the glycemic index means, the values reported for carob products, why these values differ according to the product, and how the glycemic index information should be interpreted in daily life.
What is the Glycemic Index?
The glycemic index (GI) is a measure that expresses how quickly and to what extent a carbohydrate-containing food raises blood sugar levels after consumption, relative to a reference food (usually pure glucose). In the standard method, volunteers are given a test food containing a certain amount of usable carbohydrates and a reference food, then blood glucose is measured for two hours and the area under the curve is compared.
Here are some key points to know about the glycemic index:
- GI is not a food, but A certain way of preparation of a certain product feature. Different products made from the same raw material may have different GI values.
- The GI does not take into account the serving size. For this glycemic load concept is used; glycemic load evaluates the GI and the amount of usable carbohydrates in the serving together.
- The fiber, fat, and protein content of food, the degree of processing, and its physical structure all affect the GI.
- There may be differences between individuals and between values measured on different days in the same person.
For this reason, instead of saying "the glycemic index of carob is this", it is more accurate to say "this value was measured in this study for this carob product".
Glycemic Index Values Reported for Carob Products
The main values reported for carob products in the literature are:
| Product | Reported value | Method and source |
|---|---|---|
| Carob flour | 40,6 | Value calculated in the laboratory by enzymatic hydrolysis (Dos Santos et al., cited in Goulas et al., 2016) |
| Carob snack | 40 (compared to chocolate chip cookies: 78) | Measurement in volunteers, glucose-referenced (Papakonstantinou et al., 2017) |
| Commercial carob syrup (1st product) | 56,04 ± 13,75 | Measurement in 20 volunteers (Planes-Muñoz et al., 2025) |
| Commercial carob syrup (2nd product) | 60,46 ± 26,92 | Measurement in 20 volunteers (Planes-Muñoz et al., 2025) |
When interpreting these values, it is necessary to pay attention to a few points:
Laboratory value is not the same as human measurement. The reported value of 40.6 for carob flour was calculated in the laboratory by enzymatic hydrolysis method. Such values give an idea; however, they are not a substitute for the standard GI test performed on volunteers.
The snack value does not belong only to carob. The value measured in the study in Greece is that of a snack product containing carob. Other components of the product also influence the result (Papakonstantinou et al., 2017).
Syrup values are high in spread. The magnitude of the standard deviations reported for the syrups in the Spanish study suggests that the difference in response between individuals is pronounced. The researchers reported that the syrups reduced the post-meal blood sugar response by approximately 16 percent relative to glucose control, but emphasized that the findings are preliminary evidence (Planes-Muñoz et al., 2025).
Differences by Product: Powder, Syrup, and Snack
| Fiber content | Carob powder contains high fiber (39.8 grams per 100 grams, according to USDA data). In the production of molasses and syrup, most of the fiber remains in the pulp (USDA FoodData Central, 2019). |
| Sugar density and type | The dominant sugar of carob is sucrose (Goulas et al., 2016). It has been shown that the average sucrose content in carob syrups purchased from the market in Turkey is significantly higher than glucose and fructose (Tetik et al., 2011). |
| Physical form | Carob in a solid food and carob dissolved in liquid may behave differently. |
| The rest of the recipe | Ingredients such as flour, fat, protein, and added sugar markedly alter the GI of the product. |
A striking example showing the importance of product form comes from Germany. In this study, 5 and 10 grams of polyphenol-rich carob fiber were added to 50 grams of glucose-containing water; blood sugar response increased by 47 percent and 64 percent, respectively, instead of decreasing compared to the control (Gruendel et al., 2007). On the other hand, a beverage prepared with 30 grams of carob powder was reported to be associated with lower blood sugar and insulin levels at 30 minutes than a drink prepared with 14 grams of sucrose (Amerikanou et al., 2025). The fact that products from the same raw material give different results under different conditions clearly indicates that generalizations should be avoided.
A systematic review published in 2026 evaluating 15 clinical trials also confirms this picture: solid foods containing carob generally produced a low-to-moderate glycemic response in healthy individuals, while isolated carob powder or fiber given in liquid form gave weaker or variable results (Victoria-Montesinos et al., 2026).
Glycemic Effect of Carob in Bakery Products
Carob flour is also used in product development studies aimed at reducing the glycemic response. In Italy, a gluten-free bakery product in which 40 percent of rice flour is replaced with carob pulp flour has been identified as a product capable of maintaining a low glycemic index, and consumer acceptance has been studied; the product has been described as dark, dense, and sweet, with overall appreciation remaining moderate (Esposito et al., 2024).
Fermentation may also be a factor. Fermentation of a vegetable yogurt-like product containing rice and carob flour with lactic acid bacteria reduced the estimated glycemic index by approximately 9 percent relative to the control (Demarinis et al., 2023). The expression "estimated" here indicates that the value was calculated by laboratory method.
In a study conducted in Turkey, white bread enriched with carob molasses pulp flour and wheat germ contained higher fiber, polyphenols, and resistant starch than control bread, but did not make a significant difference in blood sugar response in healthy participants (Tuşat et al., 2025). This result indicates that adding carob to a product may not always significantly alter the glycemic response.
Using Glycemic Index Information Correctly
Glycemic index values can be a useful guide; however, it alone does not determine whether a food is "healthy" or "unhealthy". A practical assessment for carob can be made as follows:
| Portion matters | Even a low GI product can create a high glycemic load when consumed in large quantities. |
| Molasses should be used with caution | Carob molasses is a dense source of sugar; even a few spoonfuls provide a significant amount of carbohydrates. |
| Powder and fruit have the advantage of fiber | Fiber-rich forms may be a more balanced choice than sugar-dense forms. |
| The whole meal should be taken into account | Consuming carob with a meal containing protein, fat and fiber may give different results than consuming it alone. |
| Those with diabetes should make an individual assessment | The recommendation of a physician or dietitian and, if necessary, personal blood sugar measurements are the most reliable guide. |
The relationship between carob and blood sugar in a broader framework Carob and Blood Sugar: Evaluation in Terms of Diabetes We discuss it in our article.
Frequently Asked Questions
What is the glycemic index of carob? There is no single value. Values of 40.6 have been reported in the laboratory for carob flour, 40 in volunteers for a carob snack, and approximately 56 and 60 for two commercial carob syrups. Values vary depending on the product and method.
Does carob molasses have a low glycemic index? In a study with commercial carob syrups, GI values were found to be around 56 and 60, and the researchers described them as low; however, inter-individual divergence is high, and molasses remains a concentrated source of sugar.
Can a low glycemic index food be consumed as much as I want? The glycemic index does not take into account the portion; the greater the amount consumed, the greater the effect on blood sugar. Therefore, the glycemic load and total energy intake should also be evaluated.
Is there a difference in glycemic between carob powder and molasses? While the powder retains most of the fiber, in the production of molasses, the fiber is largely removed and the sugar is concentrated. Therefore, the effect of the two products on blood sugar is expected to be different; no study making a direct comparison has been found.
Carob Products with Carob Türkiye
The glycemic index of carob is too product- and condition-dependent to be summarized in a single number. Current data suggest that carob products, especially those high in fiber, can be included in a balanced diet, while sugar-dense products should be consumed in moderation.
At Carob Türkiye, we supply carob fruit, crumbs, flour/powder, kernels, and extracts. Carob Flour / Powder You can review our page, for your wholesale and export requests You can contact us.
This content is for informational purposes only; it is not a substitute for medical advice.
Domestic resources
Tuşat, E., Parlak, E., Yıldırım, G., Öztop, K., Gülşen, B., Özdemir, Y., Uysal, Y., "Impact of White Bread Fortified With Carob Molasses Pulp Flour and Wheat Germ on Glycemic Response and Antioxidant Capacity in Healthy Subjects", Food Science & Nutrition, 13(12), e71046, 2025 (study conducted in Turkey). doi.
org/ 10. 1002/ FSN3. 71046 Tetik, N., Turhan, İ., Oziyci, H.R., Karhan, M., "Determination of D-pinitol in carob syrup", International Journal of Food Sciences and Nutrition, 62(6), 572–576, 2011 (study conducted in Turkey). doi.
org/ 10. 3109/ 09637486. 2011. 560564 Foreign sources
Goulas, V., Stylos, E., Chatziathanasiadou, M.V., Mavromoustakos, T., Tzakos, A.G., "Functional Components of Carob Fruit: Linking the Chemical and Biological Space", International Journal of Molecular Sciences, 17(11), 1875, 2016. doi.
org/ 10. 3390/ ijms17111875 Papakonstantinou, E., Orfanakos, N., Farajian, P., Kapetanakou, A.E., Makariti, I.P., Grivokostopoulos, N., Ha, M.A., Skandamis, P.N., "Short-term effects of a low glycemic index carob-containing snack on energy intake, satiety, and glycemic response in normal-weight, healthy adults: Results from two randomized trials", Nutrition, 42, 12–19, 2017. doi.
org/ 10. 1016/ j. nut. 2017. 05. 011 Planes-Muñoz, D., Rosell, M.L.Á., Frontela-Saseta, C., López-Nicolás, R., "Evaluation of Commercial Carob Syrups (Ceratonia siliqua L.) in Randomized Controlled Trials: Effects on Lipid, Glycaemic, and Anthropometric Parameters", Foods, 14(21), 3676, 2025. doi.
org/ 10. 3390/ foods14213676 Gruendel, S., Otto, B., Garcia, A. L., Wagner, K., Mueller, C., Weickert, M. O., Heldwein, W., Koebnick, C., "Carob pulp preparation rich in insoluble dietary fibre and polyphenols increases plasma glucose and serum insulin responses in combination with a glucose load in humans", British Journal of Nutrition, 98(1), 101–105, 2007. doi.
org/ 10. 1017/ S0007114507701642 Amerikanou, C., Kleftaki, S.A., Koutoulogenis, K., Tsiaka, T., Sigala, D., Tzavara, C., Zoumpoulakis, P., Kaliora, A.C., "Imera cultivar carob: clinical glycemic effects and phytochemical profile", Food Chemistry, 496(Pt 2), 146823, 2025. doi.
org/ 10. 1016/ j. foodchem. 2025. 146823 Victoria-Montesinos, D., González-Louzao, R., Barcina-Pérez, P., Mercader-Ros, M.T., Lucas-Abellán, C., Daruich-González, I.B., García-Muñoz, A.M., "Effects of carob (Ceratonia siliqua) and carob-derived products on glycaemic control and insulin resistance: A systematic review of clinical trials", Nutrition Research, 152, 81–98, 2026. doi.
org/ 10. 1016/ j. Nutres. 2026. 05. 007 Esposito, L., Casolani, N., Ruggeri, M., Spizzirri, U.G., Aiello, F., Chiodo, E., Martuscelli, M., Restuccia, D., Mastrocola, D., "Sensory Evaluation and Consumers' Acceptance of a Low Glycemic and Gluten-Free Carob-Based Bakery Product", Foods, 13(17), 2815, 2024. doi.
org/ 10. 3390/ foods13172815 Demarinis, C., Montemurro, M., Torreggiani, A., Pontonio, E., Verni, M., Rizzello, C. G., "Use of Selected Lactic Acid Bacteria and Carob Flour for the Production of a High-Fibre and 'Clean Label' Plant-Based Yogurt-like Product", Microorganisms, 11(6), 1607, 2023. doi.
org/ 10. 3390/ microorganisms11061607 U.S. Department of Agriculture, Agricultural Research Service, "Carob flour (FDC ID 173755), SR Legacy", FoodData Central, 2019. FDC.
Scientific Resourceshorseshoes. USDA. gov/ food- details/ 173755/ Nutrients
