Red Onion Nutrition Facts

Calories, fat, protein, and carbohydrate values for Red Onion.


There are 41 calories in Red Onion.


Nutrition Facts
Red Onion
Serving Size:


medium (94 grams)

Amount Per Serving
Calories from Fat 1.6
Calories 41

% Daily Value*

Total Fat 0.2 grams

Saturated Fat 0 grams

Trans Fat 0 grams
Polyunsaturated Fat 0.1 grams
Monounsaturated Fat 0 grams

Cholesterol 0 milligrams

Sodium 2.8 milligrams

Potassium 156 milligrams

Total Carbohydrates 9.5 grams

Dietary Fiber 1.3 grams

Sugars 4.4 grams
Protein 1.3 grams

Vitamin A


Vitamin C





Percent Daily Values are based on a 2000 calorie diet.

Food / Beverages > Produce > Onions > Red Onions (Fresh)

How long would it take to burn off 40 KCal?
Walking (3mph) 11 minutes
Running (6mph) 4 minutes
Bicycling (10mph) 6 minutes
Values estimated based on person weighing 140 lbs.

Additional Information

Red onions, with their bright purplish-red skin and distinctive flavor, are a popular ingredient in many culinary creations. Not only do they add a delightful touch of color to dishes, but they also have a number of health benefits. In this expert article, we will explore the unique characteristics, benefits, and drawbacks of red onions and why they are a remarkable addition to your diet.

Distinctive features of red onions

Red onions have several unique characteristics that set them apart from other types of onions. Here are a few notable characteristics:

  1. Colorful appearance: Red onions have an attractive purple-red skin and white flesh with a red tinge. This vibrant color adds visual appeal to salads, salsas and other dishes.
  2. Mild and sweet flavor: While red onions have the characteristic onion flavor, they are milder than other varieties. Their subtle sweetness makes them a great choice for eating raw and adds a pleasant flavor to a variety of recipes.
  3. Versatile use: Red onions are incredibly versatile in the kitchen. They can be enjoyed raw in salads, salsas and sandwiches, and they hold up well when cooked in stir-fries, soups and stews. They are also great for pickling and caramelizing, adding depth and flavor to dishes.

Health benefits of red onions

In addition to their culinary appeal, red onions offer a number of health benefits that make them an excellent addition to a healthy diet. Let’s explore some of those benefits:

  1. Antioxidant powerhouse: Red onions are rich in antioxidants, including quercetin, anthocyanins, and sulfur compounds. These antioxidants help protect the body from harmful free radicals, reducing the risk of chronic diseases such as heart disease, certain cancers, and age-related conditions.
  2. Anti-inflammatory properties: The presence of quercetin in red onions contributes to their anti-inflammatory properties. This can help reduce inflammation in the body, potentially reducing the risk of chronic conditions such as arthritis and promoting overall well-being.
  3. Support Heart Health: Red onions contain organosulfur compounds that may promote heart health. These compounds have been linked to lowering cholesterol, lowering blood pressure, and preventing blood clots, thus reducing the risk of cardiovascular disease.
  4. Digestive Wellness: The fiber in red onions supports a healthy digestive system. Adequate fiber intake promotes regular bowel movements, aids in digestion, and contributes to a balanced gut microbiome.
  5. Boost the immune system: Red onions are a natural source of vitamin C, which is essential for a strong immune system. Adding red onions to your diet can help boost your body’s defenses against common illnesses and infections.

Disadvantages and Precautions

While red onions offer numerous health benefits, it is important to be aware of some drawbacks and precautions:

  1. Allergies and Sensitivities: Some people may be allergic or sensitive to onions, including red onions. Allergic reactions can range from mild symptoms such as itching and hives to more severe reactions such as difficulty breathing. If you experience any adverse reactions after eating red onions, it is advisable to seek medical advice.
  2. Digestive Discomfort: Onions, including red onions, contain fructans, a type of carbohydrate that can cause digestive upset in some people, especially those with irritable bowel syndrome (IBS) or a sensitivity to FODMAPs. If you have these conditions, it may be beneficial to limit or avoid red onion consumption.
  3. Staining potential: The bright red pigment of red onions has the potential to stain surfaces, cutting boards, and hands. It is advisable to use caution and take appropriate precautions when preparing and cleaning up after using red onions.


In addition to being a visually appealing and flavorful addition to a variety of dishes, red onions offer a number of health benefits. From their antioxidant and anti-inflammatory properties to their potential support of heart health and immune system function, red onions deserve a place in a balanced diet. However, it is important to be aware of potential allergies, sensitivities, and digestive discomfort that some individuals may experience. By adding red onions to your culinary repertoire with care, you can enjoy their unique flavors and reap their many health benefits.

Questions and Answers

Are red onions healthier than other onion varieties?
While all onion varieties offer health benefits, red onions are particularly rich in antioxidants, such as quercetin and anthocyanins, which contribute to their vibrant color. These antioxidants provide unique health advantages, making red onions a nutritious choice.
Can red onions help lower cholesterol levels?
Red onions contain organosulfur compounds that have been associated with reducing cholesterol levels. Including red onions as part of a balanced diet, along with other heart-healthy habits, may contribute to maintaining healthy cholesterol levels.
How can I minimize eye irritation while cutting red onions?
To minimize eye irritation when cutting red onions, you can try chilling them in the refrigerator for 30 minutes before slicing. Additionally, cutting onions under running water or wearing protective goggles can help reduce eye irritation.
Are red onions safe for individuals with diabetes?
Red onions can be included in a diabetes-friendly diet in moderation. Although they contain natural sugars, their overall glycemic impact is relatively low. However, it is important to monitor portion sizes and consider individual carbohydrate goals.
Can red onions be used as a natural remedy for coughs and colds?
Red onions contain vitamin C, which can support immune function. While they may provide some relief for coughs and colds, it is important to note that they should not replace medical treatment. Red onions can be enjoyed as part of a balanced diet to support overall immune health.