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Blackberries, known for their exquisite taste and vibrant color, are a delicious summer treat and a potential ally in managing blood sugar levels. With a low glycemic index and rich in essential nutrients like vitamins C and K, blackberries are emerging as a diabetic-friendly fruit option. 

Blackberries are also a notable source of dietary fiber, providing approximately 5.3 grams per 100 grams, which can aid in maintaining stable blood sugar levels and promoting digestive health.¹ This article aims to explore the nuanced relationship between blackberries and glycemic control, shedding light on their potential as a valuable addition to a balanced diet for individuals with diabetes.

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Glycemic Index Table

Blackberries, with a serving size of 100 grams, possess a relatively low glycemic index of around 25, making them a favorable choice for individuals concerned about blood sugar management.² With approximately 9.61 grams of carbohydrates per 100-gram serving, blackberries can be incorporated into a balanced diet without causing significant spikes in blood glucose levels.¹ Considering the glycemic load (GL) per serving, which is calculated by multiplying the glycemic index by the grams of carbohydrate and then dividing by 100, the GL of blackberries per 100 grams comes to 2.53. The low GL signifies that blackberries have a minimal impact on blood sugar levels. It is worth noting that while cooking does soften the berry, it does not significantly affect the glycemic index, allowing individuals to enjoy the health benefits of blackberries, both raw and cooked.

The glycemic index (GI) is a relative ranking of carbohydrates in foods according to how they affect blood glucose levels. Foods with a low GI value (55 or less) are more slowly digested, absorbed, and metabolized, causing a lower and slower rise in blood glucose levels. Conversely, foods with a high GI value (70 or more) cause a rapid increase in blood glucose.

While some cooking methods can affect the glycemic index of certain foods, the impact on blackberries is minimal. Nonetheless, it's essential to note that combining blackberries with high-GI foods could affect the overall glycemic load of a meal, potentially causing a more significant impact on blood sugar levels.

Glycemic Index


Serving Size


Carbohydrate* per Serving (g)

9.61 g

GL per Serving


Nutritional Facts

Blackberries are a nutrient-dense fruit, boasting a wealth of vitamins, minerals, and antioxidants. A 100-gram serving of blackberries contains approximately 43 calories, 5.3 grams of dietary fiber, and 5.3 grams of sugar, making them a satisfying and relatively low-calorie snack option.¹ Additionally, blackberries are a rich source of vitamin C, with approximately 21 milligrams per 100 grams, contributing to their immune-boosting properties and overall health benefits.¹

The nutritional information below is for 100 g of blackberries.¹


43 kcal


9.61 g


1.38 g


5.3 g


0 mg


A (11 µg), B6 (0.03 mg), C (21 mg).


1 mg

Total Fat

0.48 g

Is Blackberry Good for Weight Loss?

Blackberries can be a valuable component of a weight loss regimen due to their low-calorie content, high fiber levels, and significant water content, contributing to increased satiety and reduced overall calorie intake. Additionally, the presence of vitamins, minerals, and antioxidants in blackberries can support overall health while promoting weight management. Incorporating blackberries into a well-balanced diet and regular physical activity may aid in weight loss efforts. However, it's crucial to maintain a calorie-controlled diet and consider blackberries as part of an overall healthy eating plan to achieve sustainable weight loss goals.

Is Blackberry Safe for People Living with Diabetes?

Blackberries, with their relatively low glycemic index and rich fiber content, can be a safe and beneficial addition to the diets of individuals with diabetes. The fiber in blackberries can help regulate blood sugar levels and improve insulin sensitivity, potentially aiding in better glycemic control. However, it's crucial for individuals with diabetes to consume blackberries in moderation as part of a well-balanced diet, as excessive intake might still affect blood sugar levels. Consulting with a healthcare provider or a registered dietitian can help individuals with diabetes integrate blackberries safely into their meal plans, ensuring optimal management of their condition.

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Allergies to blackberries are relatively uncommon but can occur, especially in individuals with a history of berry allergies. Symptoms may include itching, swelling, hives, or, in severe cases, anaphylaxis. Those with known sensitivities to other berries or a predisposition to oral allergy syndrome might be at a higher risk for blackberry allergies. It is advisable for individuals with a history of food allergies to consult with an allergist before incorporating blackberries into their diet.

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What is Glycemic Index?

The glycemic index (GI) is a measure of how quickly a carbohydrate-containing food raises blood sugar levels compared to a reference food, usually glucose. It ranks foods on a scale from 0 to 100, with higher values indicating a faster rise in blood sugar. The glycemic index (GI) scale is typically categorized as follows: Low GI [55 or less], Medium GI [56-69], High GI [70 or higher]. Foods with a high glycemic index digest rapidly and can cause dramatic fluctuations in blood glucose or glucose spikes.

What is Glycemic Load?

Glycemic load (GL) takes into account both the quality (glycemic index) and quantity (carbohydrate content) of carbohydrates in a specific serving of food. It is a measure of how much a particular food will raise blood sugar levels. GL is calculated by multiplying the glycemic index of a food by its carbohydrate content and dividing it by 100. It provides a more accurate representation of the overall impact of a food on blood sugar compared to the glycemic index alone.

Does Blackberry Spike Insulin?

Blackberry consumption does not directly spike insulin levels. Blackberries have a low glycemic index, meaning they have a minimal impact on blood sugar levels and insulin response. However, individual factors and portion sizes can influence the overall effect, so personalized advice from a healthcare professional is recommended.

Is Blackberry Low Glycemic?

Yes, blackberries are considered low glycemic due to their low carbohydrate content and high fiber content, which slows down the absorption of glucose into the bloodstream.

Can People Living with Diabetes Eat Blackberry?

Yes, people living with diabetes can eat blackberries as they are low in glycemic index and high in fiber, antioxidants, and vitamins. However, they should consume them in moderation and as part of a balanced diet. It is always recommended to consult a healthcare professional for personalized dietary advice.

Topics discussed in this article:


  1. USDA FoodData Central. (2019, April 1). Food Details - Blackberries, raw. 
  2. The University of Sydney. (2023, May 1). Glycemic Index – Glycemic Index Research and GI News

About the author

It is a long established fact that a reader will be distracted by the readable content of a page when looking at its layout.

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About the author

Brittany Barry is a national board-certified health coach and NASM-certified personal trainer based in South Carolina.

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Please note: The Signos team is committed to sharing insightful and actionable health articles that are backed by scientific research, supported by expert reviews, and vetted by experienced health editors. The Signos blog is not intended to diagnose, treat, cure or prevent any disease. If you have or suspect you have a medical problem, promptly contact your professional healthcare provider. Read more about our editorial process and content philosophy here.

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