How much protein is in Grapefruit juice?

Grapefruit juice, white contains 0.55g of protein per 100g. This is 1% of the recommended daily value of 50g.

Is Grapefruit juice good for weight loss?

Grapefruit juice, white has 37 calories per 100g. With fewer than 50 kcal per 100g, it is a very low-calorie food and can be included freely in most weight-loss diets.

🍎 Fruits and Fruit Juices

Calories in Grapefruit juice, white

Q: How many calories are in Grapefruit juice?

Grapefruit juice, white contains 37 calories per 100g. A typical serving of 1 cup (257g) provides 95 calories.

Q: How many carbs are in Grapefruit juice?

Grapefruit juice, white contains 7.59g of carbohydrates per 100g.

A single glass can silently alter the absorption of certain prescription medications for over 24 hours.

37 kcal

per 100g

Protein 0.55g

Carbs 7.59g

Fat 0.7g

Fiber 0.2g

What makes grapefruit juice so powerful?

White grapefruit juice contains furanocoumarins, organic chemical compounds that irreversibly inhibit an enzyme in your intestines and liver called CYP3A4. This enzyme normally metabolizes many common medications. When CYP3A4 is blocked, certain drugs can enter the bloodstream at much higher concentrations than intended, potentially causing dangerous side effects. This interaction was discovered entirely by accident in 1989 during a clinical trial studying the blood pressure medication felodipine. Researchers used grapefruit juice to mask the taste of alcohol in the study, only to find that the juice itself caused drug levels in participants' blood to spike dramatically. The effect is long-lasting; a single glass of white grapefruit juice can inhibit CYP3A4 for up to 24 hours or more, meaning the interaction occurs even if the medication is taken hours later. Unlike red or pink grapefruit, white grapefruit generally contains higher concentrations of these furanocoumarins, making its juice particularly potent. While this poses risks for those on specific statins or blood pressure drugs, it also highlights the powerful bioactive chemistry hidden inside everyday citrus fruits.

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Enzyme Inhibitor

Furanocoumarins in the juice block CYP3A4, altering how your body processes certain medications.

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Medication Interactions

Always check prescription labels, as it can amplify drug absorption for over 24 hours.

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Low Calorie Base

At just 37 calories per 100 grams, it offers a tart, hydrating base without heavy sugars.

💡 When & how to use it

If you are not taking interacting medications, white grapefruit juice makes a bright, acidic base for vinaigrettes or marinades. Its natural acidity helps break down tough proteins in seafood or poultry. Store unopened bottles in a cool, dark place, and refrigerate after opening to preserve its vitamin C content, which degrades rapidly when exposed to air and light. Pair it with fatty fish like salmon, as the tartness cuts through the richness while providing a dose of vitamin C.

Calories by Serving Size

100g

37 kcal

P 0.55g C 7.59g F 0.7g

1 cup (257g)

95 kcal

P 1.4g C 19.5g F 1.8g

200g

74 kcal

P 1.1g C 15.2g F 1.4g

50g

19 kcal

P 0.3g C 3.8g F 0.4g

Full Nutrition Facts

Per 100g — daily values based on a 2,000 calorie diet

Nutrition Facts

Serving size: 100g

Calories 37

% Daily Value*

Total Fat 0.7g 1%

Sodium 1mg 0%

Total Carbohydrate 7.59g 3%

Dietary Fiber 0.2g 1%

Protein 0.55g 1%

Vitamin C 39.4mg 44%

Calcium 16mg 1%

Iron 0.07mg 0%

Potassium 141mg 3%

* Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.

How does Grapefruit juice fit your daily goals?

🏃

7 min

Walking to burn 37 kcal

🎯

of 2,000 kcal daily goal

💪

0.55g

protein (1% of daily 50g)

⚡

servings until 2,000 kcal

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Log Grapefruit juice in CalRay — just snap a photo

CalRay's AI recognizes grapefruit juice and hundreds of thousands of other foods from a photo. No manual lookup needed.

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Frequently Asked Questions

How many calories are in Grapefruit juice, white?

Grapefruit juice, white contains 37 calories per 100g. A standard serving of 1 cup (257g) provides 95 calories. It is considered a very low-calorie food (under 50 kcal/100g), making it excellent for weight management.

How much protein does Grapefruit juice, white have?

Grapefruit juice, white provides 0.55g of protein per 100g, which is 1% of the 50g daily recommended value. It is not a primary protein source.

How many carbs are in Grapefruit juice, white?

Grapefruit juice, white contains 7.59g of carbohydrates per 100g . It also provides 0.2g of dietary fiber.

Is Grapefruit juice, white good for weight loss?

Yes! Grapefruit juice, white is very low in calories (37 kcal/100g) and can be eaten in generous portions even on a calorie-restricted diet.

How do I track Grapefruit juice, white calories accurately?

The easiest way to track grapefruit juice is with CalRay. Simply snap a photo of your meal and the AI will automatically identify the food and calculate calories and macros based on the estimated portion size — no manual lookup required. You can also search by name and adjust gram weight manually.