Guava

Food · Fruit · Food, Typed Supps

A single guava can give you more vitamin C than several oranges — seeds, skin, and all.

Stage by stage

Chewing & Breakdown (Mouth): Chewing breaks down guava's soft flesh, edible skin, and small seeds, releasing vitamin C, fiber, and carotenoids from the fruit's cell structure.
Gastric Digestion (Stomach): Stomach acid and enzymes continue disassembling the pulp, and the acidic environment helps protect the fruit's vitamin C from oxidizing.
Nutrient Absorption (Small Intestine): In the small intestine, vitamin C is actively absorbed into the bloodstream while lycopene is packaged for lymphatic uptake and fiber moves onward largely undigested.
Circulation & Use (Bloodstream & Tissues): Circulating vitamin C supports collagen production and immune cell function, while gut bacteria ferment residual fiber in the colon into short-chain fatty acids.

Timing

Guava can be eaten any time, but pairing it with a small amount of fat, such as yogurt or nuts, can improve absorption of its fat-soluble lycopene.

Time to effect

Hours: Blood vitamin C levels rise within a few hours of eating guava, and small clinical trials found guava leaf tea lowered post-meal blood sugar within about two hours.

Allergens

None of the fourteen major allergens. Derived from what this food is, not from a product label.

Eating patterns

Fits: Vegan, Vegetarian, Pescatarian, Halal, Kosher, Keto, Gluten-free. Depends on the product: Low-FODMAP.

Satiety

The satiety index is measured on 240 kcal servings. At 34 kcal per 100 g that is 698 g of this, which is not a serving anyone eats — so the index has nothing to say about it.

Environmental footprint

1.1 kg CO2e and 199 litres of freshwater per kg, matched to "Other fruit" in Poore & Nemecek (2018), Science 360.

Cost band

Cheap — roughly £3 per kg, as a band midpoint rather than a price.

Key nutrients

Nutrition per 100g

Calories: 34.4
Protein: 0.7g
Carbohydrate: 3.5g
of which sugars: 3.4g
Fat: 0.5g
of which saturated: 0g
Fibre: 5.4g
Sodium: 4mg

Food vs. supplement

Whole guava delivers vitamin C together with fiber, potassium, and carotenoids like lycopene — a combination isolated ascorbic acid or guava-leaf-extract supplements don't replicate.

Kitchen tip

Eat guava ripe, with skin and seeds, for maximum fiber and nutrients; pairing it with a little fat (yogurt, nuts) helps absorb its lycopene.

Common myth

"Guava has more vitamin C than any fruit in the world." In reality: Guava is exceptionally vitamin-C-dense — about 228 mg per 100 g (254% DV), roughly four times an orange's ~53 mg — but it isn't the record holder; acerola cherries and camu camu contain several times more vitamin C per 100 g.