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.

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

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

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.

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.