Carob and Blood Sugar: Evaluation in Terms of Diabetes
Carob is a food that seems contradictory in terms of blood sugar due to its high natural sugar content on the one hand and its components such as dietary fiber and D-pinitol on the other. Therefore, definitive statements such as "carob lowers blood sugar levels" or "diabetics should not consume it at all" do not reflect the truth.
In this article, we take a balanced view of the sugar content of carob, its components associated with blood sugar, the findings of human studies, and the points that people with diabetes or prediabetes should pay attention to.
Why is carob discussed in terms of blood sugar?
Carob is a sweet fruit and this sweetness comes from natural sugars. According to review studies, carob pulp contains around 48–56 percent sugar in dry matter, and most of this sugar is sucrose (Goulas et al., 2016). USDA data also shows that there are 49.08 grams of total sugar in 100 grams of carob flour (USDA FoodData Central, 2019).
On the other hand, the same fruit also contains these components:
| High in dietary fiber | 39.8 grams per 100 grams of carob flour (USDA FoodData Central, 2019). |
| D-pinitol | An inositol derivative whose relationship with insulin signaling pathways has been investigated; It is reported that it is found between 1.0-8.5 grams per 100 grams in dry matter in carob (Goulas et al., 2016). |
| Polyphenols and tannins | Ingredients that have been shown to be able to affect carbohydrate digestion in some laboratory and animal studies. |
The net effect on blood sugar depends on what product form, in what quantity and in which meal these ingredients are consumed.
D-Pinitol: The Most Researched Component of Carob
D-pinitol is the main component that makes carob stand out in blood sugar research. In a review published in 2026, it was stated that carob is one of the richest natural sources of D-pinitol; It was stated that D-pinitol may not act as a classic blood sugar reducer, but as a regulator that can increase the effectiveness of insulin signaling. The same review highlights that while consistent improvements were observed in animal studies, human studies yielded more heterogeneous results and data was limited (Torres-Oteros et al., 2026).
D-pinitol is also found in carob molasses. The average D-pinitol content in 10 carob syrups purchased from the market in Turkey was measured as 84.63 g/kg at dry weight (Tetik et al., 2011). However, the sum of sucrose, glucose and fructose is much higher in the same samples; therefore, the presence of D-pinitol in molasses does not eliminate the sugar load of the product.
For detailed information about D-pinitol What is D-Pinitol in Carob? You can check our article.
Clinical Studies on Prediabetes and Insulin Resistance
Some clinical studies conducted with inositol-rich products obtained from carob are as follows:
Spain, 2016. In a 12-week double-blind, randomized, controlled study conducted in 44 people with fasting blood sugar disorders, one group consumed a carob-derived drink containing predominantly pinitol (2 grams twice a day) and the other group consumed a sucrose-sweetened beverage. In non-obese participants, a 14.4 percent decrease in insulin level and a 15.1 percent decrease in the HOMA-IR insulin resistance index were reported in the pinitol beverage group. In obese participants, changes in inflammation markers were observed more (Bañuls et al., 2016).
Spain, 2026. In a 90-day double-blind, placebo-controlled study in 52 people with confirmed prediabetes, participants used a special liquid concentrate containing carob inositols (D-pinitol, myo-inositol, D-chiro-inositol) at 6.66 grams (in two doses) per day. Improvement in HbA1c and glucose levels was reported in the active product group compared to placebo (Pérez-Piñero et al., 2026).
Although these studies are promising, it should be noted that the products used are standardized inositol preparations. Foods such as carob powder or molasses do not have the same composition as these preparations.
Post-Meal Blood Sugar: Why Product Form Matters
The results of studies examining the effect of carob on post-meal blood sugar differ markedly according to the form of the product used.
In solid food form: In a study conducted in Greece, the glycemic index of a carob snack was measured as 40, and that of a chocolate chip cookie containing equally usable carbohydrates was measured as 78; consuming a carob snack before a meal reduced the blood sugar response to the meal that followed (Papakonstantinou et al., 2017).
In beverage form: In a study conducted in Greece with 15 healthy men, a drink made with 30 grams of carob powder was associated with lower blood sugar and insulin levels at 30 minutes compared to a drink prepared with 14 grams of sucrose (Amerikanou et al., 2025).
When fiber is added to the glucose solution: On the other hand, in a study conducted in Germany, adding 5 and 10 grams of polyphenol-rich carob fiber to water containing 50 grams of glucose increased post-meal blood sugar by 47 percent and 64 percent, respectively, compared to the control; the researchers stated that this indicates a deterioration in glycemic control (Gruendel et al., 2007).
This table is also in line with the result of a systematic review published in 2026: Researchers evaluating 15 clinical trials reported that solid foods containing carob generally produced a low-to-moderate blood sugar response in healthy individuals, while isolated carob powder or fiber given in liquid form showed weaker or variable effects. The same review emphasized that the evidence in individuals with type 2 diabetes is limited, and the insulin-sensitizing effects specific to carob remain at a preliminary level (Victoria-Montesinos et al., 2026).
We discuss the glycemic index separately in our article Glycemic Index of Carob.
Animal and Laboratory Studies
Laboratory studies shed light on the mechanisms by which carob may affect carbohydrate digestion. In a study conducted in Spain, carob fruit extract inhibited the enzyme alpha-glucosidase, which plays a role in carbohydrate digestion, and reduced glucose diffusion in a laboratory environment; in rats, it was reported to reduce the blood sugar response to glucose loading (Macho-González et al., 2017).
Such studies are valuable for understanding possible mechanisms; however, they do not indicate that the same result will be obtained in humans. The doses of extracts used in animals and the forms of administration are very different from daily food consumption.
Practical Assessment for Those with Diabetes or Prediabetes
In light of the available evidence, the following points should be underlined for people with diabetes or prediabetes:
- Carob is not a diabetes treatment. No carob product is a substitute for drug therapy.
- It contains natural sugar. Carob powder, and especially molasses, should be included in the carbohydrate count.
- The product form is important. Molasses and syrup contain much less fiber than powder and are more sugar-dense.
- The portion is decisive. A spoonful of molasses with a small amount of carob powder can have different effects on blood sugar.
- The individual response is different. People who measure blood sugar can observe their response to a new food with their own measurements.
- A physician should be consulted for supplements. Supplements containing inositol or D-pinitol should be discussed with a physician before using them with diabetes medications.
In a study conducted in Turkey, white bread enriched with carob molasses pulp flour and wheat germ was found to be rich in fiber and polyphenols than control bread; however, it did not make a significant difference in blood sugar response in healthy participants (Tuşat et al., 2025). This result reminds us that adding a single ingredient may not always make a significant difference on blood sugar.
Frequently Asked Questions
Can diabetics eat carob? Carob is a food containing natural sugar; People with diabetes can consume it within the framework of the nutrition plan recommended by their physician or dietitian, controlling the portion and including it in the carbohydrate calculation. The final decision should be made according to the individual situation.
Does carob lower blood sugar? Some studies with special preparations containing carob inositols have reported positive results on insulin resistance or HbA1c. However, these results are limited and cannot be generalized to carob powder or molasses.
Can carob molasses be used as a sugar substitute? Molasses is a natural sweetener that can be used as a substitute for sugar; however, it also contains high levels of sugar. It should not be seen as a "sugar-free" alternative for diabetes.
Can I use D-pinitol supplements? The use of supplements should be evaluated with a physician, especially in people taking diabetes medication.
Carob Products with Carob Türkiye
Carob; It is a food that contains natural sugar, fiber and D-pinitol together, so it should be evaluated carefully and consciously in terms of blood sugar. Although scientific studies reveal interesting results, current evidence supports moderate consumption of carob as part of a balanced diet.
At Carob Türkiye, we supply carob fruit, crack, flour/powder, kernel and extract. For information about our extract product containing D-pinitol D-Pinitol Extract 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
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 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.
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