Jam
Food · Pantry & Condiment · Food, Typed Supps
The sugar in jam is not just for sweetness — it is doing the setting and the preserving.
Stage by stage
- Intake (Sweetness registered): Sugar is detected immediately, with almost nothing in the spread to slow it.
- Stomach (Little digestion needed): Sugars require minimal breakdown; the surviving pectin adds only modest viscosity.
- Small intestine (Rapid absorption): Sucrose is split and absorbed quickly, producing a fast glucose rise on a refined-flour carrier.
- Liver (Fructose handled, energy stored): Fructose is metabolised largely hepatically; unused glucose is stored.
Time to effect
- Under an hour: Blood glucose rises within roughly 15 to 45 minutes, faster on white bread than on a wholegrain carrier.
Allergens
None of the fourteen major allergens. May contain: Sulphites. Derived from what this food is, not from a product label.
Eating patterns
Fits: Vegan, Vegetarian, Pescatarian, Halal, Kosher, Gluten-free. Depends on the product: Low-FODMAP.
Satiety
Not scored: the satiety index is measured on 240 kcal servings, and nobody eats a 240 kcal serving of this. The question does not apply rather than the answer being unknown.
Cost band
Mid — roughly £5 per kg, as a band midpoint rather than a price.
Key nutrients
Nutrition per 100g
- Calories: 251
- Protein: 0.2g
- Carbohydrate: 64.4g
- of which sugars: 64.3g
- Fat: 0g
- of which saturated: 0g
- Fibre: 0.9g
- Sodium: 14mg
Food vs. supplement
No supplement comparison applies. Compared with whole fruit, jam loses most of the vitamin C to heat and most of the fibre to the boil, and adds roughly its own weight in sugar.
Kitchen tip
Stone fruits set on their own because they carry enough pectin and acid; low-pectin fruits need added pectin or lemon juice to gel at all.
Common myth
“Jam is made from fruit, so it counts as fruit.” In reality: By weight it is roughly two-thirds sugar, and most of the fruit's vitamin C is destroyed by boiling. A spoonful has a fraction of the fibre of the fruit it was made from.
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