Grapefruit Nutrition Facts
Complete grapefruit nutrition breakdown with 42 kcal per 100g, glycemic index, and diet compatibility.
Written by Victura Nutrition TeamReviewed by Victura Editorial ReviewLast updated Jul 15, 2026
42
Calories
0.8g
Protein
10.7g
Carbs
Use caution
Is it healthy?
per 100g · per panel values
Track this food in VicturaQuick answer
A 100g serving of grapefruit provides about 42 kcal. Per 100g you get about 10.66g carbs and 0.77g protein. Glycemic index is around 25.
Grapefruit is a whole food with approximately 42 calories per 100g, tracked in Victura for macro-aware meal logging.
- Calories (100g serving)
- 42 kcal
- Carbs (100g)
- 10.66g
- Protein (100g)
- 0.77g
- Serving reference
- 100g · 100g serving
- Glycemic index
- 25
Serving calculator
How much did you eat or drink — Grapefruit?
42
Calories
0.8g
Protein
10.7g
Carbs
0.1g
Fat
Nutrition facts
per 100g · Source: USDA FoodData Central (seeded Phase 0)
42 kcal
Calories
Vitamins
- Vitamin C: 31.2mg
Minerals
- Potassium: 135mg
Scientific explanation
Research-backedGrapefruit provides approximately 42 kcal per 100g with 0.8g protein, 10.7g carbohydrates, and 0.1g fat. Dietary fiber is 1.6g per 100g. The glycemic index is estimated at 25 (low), meaning glucose rises at a slow rate after consumption. Values are sourced from USDA FoodData Central and reviewed for editorial accuracy.
Community insights
Community insightAmong Victura meal logs, grapefruit appears frequently as a portable snack and smoothie ingredient. Users pairing it with yogurt or nuts report steadier energy than eating it alone on an empty stomach.
Pros
- Grapefruit is a whole food with measurable macro nutrients
Cons
- Portion size still matters for calorie goals
Best time to eat
Pair with protein and fiber for balanced meals.
Good windows
- With main meals
Consider avoiding
- Very large portions without activity
Diet compatibility
Weight loss
Use caution
At 42 kcal and 1.6g fiber per 100g, this food is energy-dense - watch portions.
Keto
Use caution
Net carbs ~9.1g per 100g - too high-carb for standard keto.
Diabetic friendly
Friendly
GI 25 with 6.9g sugar - generally blood-sugar friendly in moderation.
Frequently asked questions
People also ask
Is a grapefruit healthy?
Yes — a grapefruit is a whole food with measurable nutrients. Healthiness depends on overall diet, portions, and your goals. Estimated GI is 25.
Can I eat a grapefruit every day?
Most people can include a grapefruit daily as part of a balanced diet, as long as total calories and carbs fit their plan.
Are Grapefruits good for weight loss?
At 42 kcal and 1.6g fiber per 100g, this food is energy-dense - watch portions.
How many calories are in a grapefruit?
A typical medium serving of grapefruit has about 42 calories, while 100g contains about 42 calories (USDA reference).
Are Grapefruits good before a workout?
Grapefruits can work before activity when you want easy carbs; pair a grapefruit with protein if your session is long.
Are Grapefruits high in sugar?
Grapefruits contain about 6.9g sugar per 100g — mostly natural sugars when whole.
Is grapefruit good for weight loss?
At 42 kcal and 1.6g fiber per 100g, this food is energy-dense - watch portions.
Is grapefruit keto-friendly?
Net carbs ~9.1g per 100g - too high-carb for standard keto.
What is the glycemic index of grapefruit?
Estimated GI is 25. Pair with protein or fat to blunt glucose response.
Is grapefruit safe for people with diabetes?
GI 25 with 6.9g sugar - generally blood-sugar friendly in moderation.
How many calories does a grapefruit have?
A raw grapefruit contains 42 calories (kcal) per 100g. A typical medium-sized whole grapefruit (approx. 120g of edible portion) provides about 50 calories, making it an excellent low-calorie snack.
How we review this guide
- Written by
- Victura Nutrition Team
- Reviewed by
- Victura Editorial Review
- Reference sources
- 4
- Last updated
- Jul 15, 2026
References
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