One orange covers an adult's daily vitamin C requirement. But that alone does not describe the fruit.
The white layer around the segments — the albedo — concentrates flavonoids like hesperidin along with pectin. The more carefully you strip it away, the closer what remains gets to plain sugar.
Key benefits
Vitamin C for collagen and immunity
53 mg per 100 g, so one fruit covers the day. Vitamin C is an essential cofactor in collagen synthesis and sharply increases absorption of plant-source iron.
Hesperidin acts on vascular function
This citrus flavonoid appears repeatedly in studies of endothelial function and modest blood pressure reduction. It is concentrated in the pith and peel.
Pectin flattens the glucose response
A whole orange raises blood sugar far more slowly than the same amount as juice, because the fibre slows sugar absorption.
Citrate is used to prevent kidney stones
Citrus citrate raises urinary citrate, which inhibits calcium crystal formation. That is why citrus is recommended in diets aimed at preventing stone recurrence.
How to eat it well
- Do not pick off the white pith. The fibre and hesperidin are in it.
- Whole beats juice. Juice has no fibre and a glass carries the sugar of three or four oranges.
- Vitamin C degrades with heat and light. Eat it soon after peeling.
- If you are low on iron, eat it alongside plant-source iron to raise absorption.
- The zest is rich in aroma and flavonoids. Wash well before using, given pesticide residues.
What to watch out for
- With acid reflux, the acidity can worsen symptoms.
- Unlike grapefruit, sweet oranges barely interact with medication — but Seville (bitter) oranges behave more like grapefruit, so take care.
- Juice is concentrated in sugar: if you manage blood glucose, choose the whole fruit.
- The acid means brushing right after eating can damage enamel.
Nutrition
Approximate values per 100 g edible portion.
- Calories
- 47 kcal
- Carbohydrates
- 11.8 g
- Fiber
- 2.4 g
- Sugars
- 9.4 g
- Protein
- 0.9 g
- Vitamin C
- 53 mg
- Folate
- 30 µg
- Potassium
- 181 mg
Key nutrients
- Vitamin C
- Folate
- Fiber
- Potassium