Calories in a Grapefruit: Full Nutrition Breakdown
Half a grapefruit has about 52 calories. See the complete nutrition breakdown by size with expert FAQ.
Grapefruit is a tangy, slightly bitter citrus fruit known for its low calorie count and high vitamin C content. It is one of the most nutrient-dense fruits per calorie, providing significant amounts of vitamin A, potassium, and powerful antioxidants like lycopene and naringenin.
Calories by serving size:
| Serving | Weight | Calories | Carbs | Sugar | Fiber | Vitamin C |
|---|---|---|---|---|---|---|
| Half fruit (pink/red) | ~123 g | 52 kcal | 13 g | 8 g | 2.0 g | 64% DV |
| 1 whole fruit | ~246 g | 104 kcal | 26 g | 16 g | 3.9 g | 128% DV |
| 1 cup sections | ~230 g | 97 kcal | 25 g | 15 g | 3.7 g | 120% DV |
| 100 g | 100 g | 42 kcal | 11 g | 7 g | 1.6 g | 52% DV |
Pink and red grapefruit varieties contain lycopene and beta-carotene, giving them a nutritional edge over white grapefruit. A single grapefruit provides more than a full day's worth of vitamin C.
Frequently Asked Questions (FAQ)
How many calories are in half a grapefruit?
Half a medium grapefruit (about 123 grams) contains approximately 52 calories. This serving provides 13 grams of carbohydrates, 8 grams of natural sugar, 2 grams of fiber, and an impressive 64% of your daily vitamin C needs.
Does grapefruit help with weight loss?
Research supports grapefruit's role in weight management. A study published in the Journal of Medicinal Food found that participants who ate half a grapefruit before meals lost significantly more weight than those who did not. Grapefruit is very low in calories, high in water content (about 88%), and its fiber helps increase satiety.
Does grapefruit interact with medications?
Yes. Grapefruit contains compounds called furanocoumarins that inhibit the enzyme CYP3A4, which metabolizes many common medications. This can cause drugs to build up to potentially dangerous levels in the body. Affected medications include certain statins, blood pressure drugs, immunosuppressants, and anti-anxiety medications. Always check with your doctor or pharmacist if you take prescription medications.
Is pink grapefruit healthier than white?
Pink and red grapefruit contain lycopene and beta-carotene that white grapefruit lacks, making them slightly more nutritious. Pink grapefruit also tends to taste sweeter and less bitter. Calorie content is nearly identical across all varieties. For maximum antioxidant benefit, choose the deepest red varieties available.
How much vitamin C is in a grapefruit?
A whole grapefruit provides about 128% of the daily recommended value for vitamin C, making it one of the richest fruit sources. Vitamin C is essential for immune function, collagen production, and iron absorption. The vitamin C in grapefruit is well-absorbed and works synergistically with the fruit's bioflavonoids.
How many calories are in half a grapefruit?
Does grapefruit help with weight loss?
Does grapefruit interact with medications?
Is pink grapefruit healthier than white?
How much vitamin C is in a grapefruit?
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