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Grapefruit Nutrition: A Guide to Calories, Vitamins, and More

Grapefruits are a highly nutritious fruit that are easy to integrate into your diet. Grapefruit nutrition is significant because the fruit provides many vitamins, minerals, hydration, and potential health benefits. Grapefruits are one of the most popular modern citrus varieties. As a citrus fruit, grapefruit is chock full of vitamin C and other nutrients that are essential for health. 

A salad of grapefruit, prawns, avocado, and cucumber -- a sophisticated, but simple way to enjoy grapefruit nutrition
If you think grapefruit is strictly a breakfast food, a meal of grapefruit, prawns, avocado, and cucumber is sure to change your view about this fruit!

You may be wondering about grapefruit nutrition, whether the grapefruit is a healthy snack, or how to integrate it into your diet. Read on to find out all you need to know before trying this delicious, sweet-sour citrus for the first time or making it a regular treat.

The Benefits of Grapefruit Nutrition

Grapefruit has a long list of reasons why it can be a beneficial addition to your diet.

Closeup of pink grapefruit wedges.

Vitamins In Grapefruit 

Grapefruits are extremely high in vitamin C. Vitamin C is crucial for many necessary bodily functions. Half a grapefruit contains 38.4 mg of vitamin C, as opposed to 51.1 mg in a whole orange and 30.7 mg in a whole lemon. 

Vitamin C helps protect your body against free radicals, reducing the risk of diseases like cancer, heart disease, and more. It also helps your body absorb more iron, which is why many doctors recommend taking iron pills with a glass of orange or grapefruit juice. 


Grapefruit is full of many important minerals that can improve your body’s health and function. The fruit is packed with minerals such as:

  • Phosphorous
  • Potassium
  • Folate
  • Fiber
  • Iron
  • Magnesium
  • Calcium
  • Choline


Grapefruit has long been touted as a weight loss food. While there is no evidence to suggest that grapefruit has fat burning qualities, it is great for people on a diet. This boils down to its fiber content, which slows digestion and helps people feel fuller for longer. A whole grapefruit has about four grams of fiber. 

In addition to helping improve feelings of satiety and slowing digestion, fiber also helps regulate bowel movements. Grapefruit is an excellent choice for anyone struggling with chronic constipation or other digestive issues.

A salad of grapefruit, spinach, and cottage cheese -- another simple but tasty way to enjoy the benefits of grapefruit nutrition.
Grapefruit, spinach, and cheese salad.


Antioxidants help protect your body from the damaging effects of free radicals. Grapefruit offers a number of antioxidants that can be highly beneficial, including vitamin C. Free radicals are cells that scientists believe may increase your risk of cancer. As a result, antioxidant-rich foods such as grapefruit may decrease your risk of developing associated diseases. 

Though this is not enough to combat cancer in and of itself, people who are genetically inclined to certain cancers or who have a higher risk of cancer may benefit from a diet rich in antioxidants. 

Other Nutrients

In addition to all these nutrients listed above, grapefruits also have high amounts of other vitamins and minerals. All these together make it one of the healthiest fruits you can eat. 

Water. Grapefruits are 90 percent water, making them a great aid in proper hydration. Between the high fiber content and the high water content, grapefruit is ideal for regulating digestive issues that can be affected by dehydration and fiber intake. 

Calories in grapefruit. Although grapefruit is packed with nutrients, it is quite low in terms of calories. This is yet another reason why it is a great choice for people who are looking to lose weight. 

Skin protection. The high levels of vitamin C in grapefruit may have a significant effect on your skin’s elasticity. Vitamin C increases collagen levels, which in turn reduce the effects of sun damage and natural aging. In fact, some research even indicates that there is a link between good vitamin C consumption and the risk of developing malignant melanoma. 

Closeup of a baked half of grapefruit with honey, cinnamon, and ginger.
Baked grapefruit with honey, cinnamon, and ginger.

The Amazing Health Benefits Of Grapefruit 

So with all of these vitamins and minerals catalogued, what health benefits does grapefruit actually have? This extraordinarily nutritious fruit can help your body regulate itself and even fight against disease. Here are some of the top health benefits of eating grapefruit. 

Stroke reduction – Grapefruit is full of nutrients which may play a part in reducing your risk of stroke. These nutrients, known as flavonoids, are found in citrus fruits. Studies have shown a significantly decreased risk of stroke in women who consume high levels of flavonoids through citrus fruit.

Diabetes – While most types of fruit are a cause of concern for diabetics due to the high sugar content, grapefruit is actually a great choice for diabetics. The fruit is low on the glycemic index, meaning that it has significant nutritional benefits but minimal effect on blood sugar levels. In fact, some studies have indicated that grapefruit may contain compounds that help regulate blood sugar, potentially reducing the risk of type II diabetes.

Cancer – As we mentioned above, grapefruit is full of antioxidants, which are known to combat free radicals that increase the risk of cancer. One of the antioxidants abundant in grapefruit is vitamin C; another is lycopene, which is found in many types of red fruits and vegetables including tomatoes and watermelon. Lycopene is associated with a dramatically lowered risk of cancer. For this reason, red grapefruit varieties may be even healthier than white grapefruit varieties.

Glasses of chia pudding topped with segments of grapefruit and pomegranate seeds -- the two antioxidant-loaded fruits add extra punch to grapefruit nutrition.
Chia Pudding with Grapefruit and Pomegranate Seeds.

Immune system function – Many of the vitamins and minerals found in grapefruit play a vital role in regulating the immune system and helping it function to the best of its capacity. Vitamin C intake may be related to your body’s ability to fight infection, such as respiratory tract infections. People who have other lifestyle choices that may suppress their immune system function (such as smoking) or those who have chronic health conditions may be able to fight off illness more effectively with a proper vitamin C intake. 

Heart health – Grapefruit is full of nutrients that play a vital role in maintaining heart health and promoting proper blood pressure. These nutrients include fiber, choline, lycopene, potassium, and vitamin C. Grapefruit’s particular combination of these vitamins and minerals increases its ability to help fight high blood pressure and the risk of developing heart disease. 

Obesity – Though, as we mentioned above, grapefruit is not considered a fat-burning food, it can indeed play a role in reducing obesity. This is because of its role in regulating blood pressure and fat content in the blood, which is related to obesity. In this way, grapefruit may play a role in a person’s long-term likelihood of becoming obese.

What About Sugar? 

Grapefruit’s sugar content is much lower than many other fruits. For most people, the sugar content in grapefruit doesn’t pose much or any issue. Those with conditions that require close monitoring of blood sugar may want to exercise extra caution when consuming grapefruit products. 

Closeup of a grapefruit half sprinkled with sugar -- the way most people think of taking advantage of the benefits of grapefruit nutrition.
Eaten fresh and sprinkled with a little sugar in the morning is how most people think of making grapefruit a regular part of their diet.

Side Effects/Health Risks Of Grapefruit 

Grapefruit is nutritious but, like many foods, is not safe for everyone. Grapefruit allergies are quite rare, though not impossible. However, prescription medications are the main factor to consider when deciding whether to consume grapefruit. SSRIs and other prescription medications can be seriously adversely affected by compounds in grapefruit. 

Consuming grapefruit while on these medications can potentially cause serious side effects, including overdose. That’s because grapefruit can cause the body not to absorb medications properly, eventually absorbing too much all at once.

Always consult your prescription labels and your healthcare provider before consuming grapefruit in any amount. Even small quantities, such as an eight ounce glass of juice, can be enough to cause serious health risks.

Simple, Healthy Grapefruit Recipes 

There are many ways to prepare grapefruit. Many people enjoy it raw, but you can incorporate it into all kinds of dishes both sweet and savory. Grapefruit varieties with high moisture content are excellent for juicing or adding to smoothies for a unique citrusy taste. If you want some ideas for how to incorporate grapefruit into your diet, check out our post about healthy grapefruit recipes.

A citrus galette made with grapefruit and orange segments.
A galette made with grapefruit and oranges is citrus twist on a classic fruit dessert.

Grapefruit Nutrition FAQs 

Is Grapefruit a Better Source Of Vitamin C Than Other Citrus Fruits? 

A whole grapefruit contains about 38.4 mg of vitamin C, as opposed to 30.7 mg in a lemon, 19.5 mg in a lime, and 51.1 mg in an orange. Therefore oranges are the highest in vitamin C of all the most common citrus fruits found in the United States. (It is worth noting that citrus fruits aren’t the only excellent source of vitamin C — a single strawberry contains 7.1 mg!)

What Are the Different Types Of Grapefruit? 

There are more than a dozen different varieties of grapefruit commonly found in commercial and backyard grows. Grapefruit varieties are distinguished mostly by color, with some important variations in flavor as well. This citrus ranges from white, yellow, and pink to deep red. Grapefruit, being a cross of the pomelo and the sweet orange, takes on the qualities of both to different extents. This explains much of the diversity in flavor and appearance.

White grapefruit, also known as the Texas grapefruit, is a moderately-sized fruit with a mild flavor. It has a pale inner flesh and a lower juice content than red grapefruit varieties.

Star Ruby grapefruit, known for its deep rich red flesh, is one of the most popular red grapefruit varieties in the United States. It has a rich, sweet-tangy flavor. Its high water content makes it ideal for juicing for use in beverages, cocktails, sauces, and cooking. 

Less common in certain markets though still notable grapefruit varieties include the Flame grapefruit, Marsh Seedless grapefruit, Oro Blanco, Melogold, Thompson grapefruit, Lavender Gem, Duncan, and pink grapefruits. While each of these has unique color, flavor, and nutritional qualities, they share a large degree of overlap.

Can I Eat Grapefruit If I’m Taking Medications? 

You may have heard that you can’t eat grapefruit if you are taking medication. This isn’t universally true — there are many medications that don’t react with grapefruit. However, some types are liable to interact, resulting in your body absorbing too much or not enough of your medication, which can be very dangerous! You should avoid eating grapefruit or drinking grapefruit juice if you take certain medications for blood pressure, cholesterol, heart issues, clotting, or anxiety/depression.


Grapefruit ice pops -- an easy but tasty way to enjoy grapefruit nutrition.
Grapefruit ices are an easy, and refreshing way to enjoy the benefits of grapefruit nutrition.

Grapefruits are a nutritious addition to the average balanced diet. Most people can add grapefruit to their dietary regimen without much trouble. Grapefruit is easily integrated raw, in meals and desserts, juices and smoothies, and more. Since grapefruit is malleable when cooked and part of so many cuisines internationally, it’s simple to integrate it into daily life.

Do you have a favorite grapefruit? Share it in the comments!

Want to learn more about grapefruits? Next, visit our grapefruit trees page to discover information on planting, growing, caring, cooking, and more!