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Red grapes have long been a popular snack choice due to their natural sweetness and convenience. Apart from their delectable taste, red grapes possess a unique nutritional profile that includes essential vitamins and minerals such as vitamin C and potassium and a considerable amount of antioxidants. 

Moreover, despite their natural sugars, red grapes boast a relatively low glycemic index, making them a favorable option for individuals seeking to manage their blood sugar levels. Red grapes provide a rich source of polyphenols, which may contribute to their potential health benefits beyond their impact on glycemic response.¹ 

This article will explore the intricate relationship between red grape consumption, glycemic control, and the broader health implications of incorporating red grapes into a balanced diet.

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Glycemic Index Table

According to the available data, a 100-gram serving of red grapes contains approximately 17 grams of carbohydrates.¹ The glycemic index of red grapes is estimated to be medium, ranging from 43 to 53.² Considering the carbohydrate content and the glycemic index, the glycemic load per serving of red grapes is roughly 7 to 9. 

The glycemic index represents the rate at which a carbohydrate-containing food raises blood glucose levels. Foods with a high glycemic index tend to cause a rapid spike in blood sugar levels, while those with a low glycemic index lead to a slower, more gradual increase. Cooking can affect the glycemic index of certain foods; however, with red grapes, the glycemic index remains relatively stable whether consumed fresh or in cooked forms. It is crucial to consider not only the glycemic index but also the portion sizes and the overall dietary context when managing blood sugar levels.

Glycemic Index


Serving Size


Carbohydrate* per Serving (g)

17 g

GL per Serving


Nutritional Facts

Red grapes are a delectable and convenient snack and a rich source of essential nutrients. They are packed with vitamins such as vitamin C and vitamin K, along with vital minerals like potassium and copper.¹ Additionally, red grapes contain powerful antioxidants, including resveratrol and flavonoids, which have been associated with various health benefits, including potential anti-inflammatory and heart-protective effects. 

The nutritional information below is for 100 g of red grapes.¹


69 kcal


17 g


0.72 g


0.9 g


0 mg


A (3 µg), B6 (0.09 mg), C (3.2 mg).


2 mg

Total Fat

0.16 g

Are Red Grapes Good for Weight Loss?

Red grapes can be a valuable component of a weight loss regimen due to their low-calorie density and high water content, making them a satisfying and hydrating snack option. Furthermore, the presence of dietary fiber in red grapes can promote feelings of fullness and aid in better appetite control, potentially supporting weight management efforts. 

Studies cited by the United States Department of Agriculture (USDA) suggest that incorporating red grapes into a well-balanced, calorie-controlled diet, alongside regular physical activity, can contribute to an overall healthy eating pattern conducive to weight loss.¹

Are Red Grapes Safe for People Living with Diabetes?

Red grapes can be a beneficial addition to the diet of individuals with diabetes, given their relatively low glycemic index and potential health-promoting properties. 

Studies suggest that the polyphenols present in red grapes may help improve insulin sensitivity and reduce the risk of certain complications associated with diabetes, such as cardiovascular disease. Additionally, the fiber content in red grapes may contribute to better blood sugar management. 

A review of the nutritional composition of red grapes by the American Diabetes Association (ADA) indicates that incorporating red grapes into a well-balanced diet in appropriate portion sizes can be a safe and nutritious choice for individuals with diabetes.

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Allergic reactions to red grapes, although relatively uncommon, can manifest in various forms, ranging from mild oral allergy syndrome symptoms such as itching and swelling of the lips and mouth to more severe anaphylactic reactions. Research suggests that red grape allergies can be triggered by specific proteins found in the fruit and, in some cases, may also be linked to cross-reactivity with other fruits or pollen, especially in individuals with existing pollen allergies. 

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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 Red Grapes Spike Insulin?

Red grapes have a low glycemic index, which means they do not cause a rapid increase in blood sugar levels. Therefore, they do not spike insulin levels. In fact, some studies have shown that compounds found in red grapes, such as resveratrol, may actually improve insulin sensitivity and help regulate blood sugar levels.

Are Red Grapes Low Glycemic?

Yes, red grapes have a low glycemic index, meaning they do not cause a rapid increase in blood sugar levels.

Can People Living with Diabetes Eat Red Grapes?

Yes, people living with diabetes can eat red grapes in moderation as they have a low glycemic index and contain antioxidants that may benefit their health. However, it is important to monitor portion sizes and overall carbohydrate intake to maintain blood sugar levels. Consultation with a healthcare provider or registered dietitian is recommended for personalized dietary advice.

Topics discussed in this article:


  1. USDA FoodData Central. (2022, October 28). Food Details - Grapes, red, seedless, 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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