Grapefruit illustration

Grapefruit

Citrus

The Verdict

Grapefruit provides 42 kcal per 100g as a low calorie, low-fibre food. Its macronutrient profile shows 0.8g protein, 0.1g fat, and 10.7g carbohydrates.

The Lab Report

Per 100g, Grapefruit delivers 0.8g protein, 0.1g fat (0g saturated), and 10.7g carbohydrates with 1.6g dietary fibre. Of the carbohydrates, 6.9g are sugars. Notable micronutrients include Vitamin C (31.2mg).

The Safety Protocol

Grapefruit interacts with many medications including statins, calcium channel blockers, and immunosuppressants. Consult your pharmacist.

Medical Alert: Grapefruit interacts with many medications including statins, calcium channel blockers, and immunosuppressants. Consult your pharmacist.
For informational purposes only — not medical advice. Always consult your doctor.

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Protocol Ratings

Acid Reflux RED

Acid Reflux Protocol

Grapefruit is highly acidic (pH 3.0–3.5) and contains citric acid that directly irritates the oesophageal lining. The acidity can also stimulate additional gastric acid production.

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Low Sugar AMBER

Low Sugar Protocol

Grapefruit contains 6.9g total sugar per 100g — low for citrus. As a whole fruit, these are intrinsic sugars, not free sugars (WHO/SACN). A reasonable choice in moderation.

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Lose Weight GREEN

Lose Weight Protocol

Grapefruit provides 42 kcal/100g. Some research suggests grapefruit compounds may help with insulin resistance, potentially supporting weight loss.

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Balance GREEN

Balance Protocol

Grapefruit provides vitamin C, fibre, and beneficial plant compounds. A nutritious citrus fruit for a balanced diet (check medication interactions).

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Quick Reference

Deception Level LOW
Satiety ROI MEDIUM
Binge Risk 1/10

Nutritional Profile

Per 100g · Source: USDA FoodData Central

Calories 42.0 kcal
Protein 0.8 g
Fat 0.1 g
Saturated Fat 0.0 g
Carbohydrates 10.7 g
Fibre 1.6 g
Sugar 6.9 g
Sodium 0.0 mg
Potassium 135.0 mg
Calcium 0.0 mg
Iron 0.0 mg
Vitamin C 31.2 mg
Vitamin D 0.0 µg

Forensic Analysis

Calorie Density LOW

Low calorie density (42 kcal/100g) allows generous portions without significant caloric impact.

Satiety ROI LOW

Poor satiety return. Low protein (0.8g) and fibre (1.6g) provide minimal fullness for the caloric cost.

Tracking Difficulty LOW

Easy to track accurately. Consistent form with predictable caloric content per unit.

Frequently Asked Questions

How many calories and carbs are in Grapefruit?

Grapefruit contains 42 kcal and 10.7g of carbohydrates per 100g.

DietVox Insight: DietVox rates Grapefruit with a 'LOW' Deception Level, meaning visual estimation is reasonably reliable for this food.

Is Grapefruit good for weight loss?

Yes, at 42 kcal/100g, Grapefruit is a low-calorie option that supports weight loss when part of a balanced diet.

DietVox Insight: DietVox rates the Satiety ROI as MEDIUM, so pairing with protein or fibre sources enhances fullness.

Is Grapefruit bad for acid reflux?

Yes, Grapefruit is classified as a reflux trigger. It may relax the lower oesophageal sphincter or irritate the stomach lining.

DietVox Insight: DietVox Intelligence identifies this as a trigger food for the Acid Reflux protocol. Consider alternatives with a GREEN rating.

Citations & Sources

  1. Nutritional composition data for Grapefruit, per 100g serving. USDA FoodData Central
  2. Grapefruit interacts with many medications including statins, calcium channel blockers, and immunosuppressants. Consult your pharmacist. NHS UK

Scan your food to eat smarter with DietVox

Get it on Google Play
QR Code – Scan to download DietVox Scan to download