Yeast

Food · Pantry & Condiment · Food, Typed Supps

Extraordinary nutrition per 100g, and almost nobody eats anything close to 100g of it.

Stage by stage

In the dough (Fermentation): Yeast ferments sugars to carbon dioxide and ethanol, raising the loaf and generating flavour compounds.
Baking (Thermal death): The cells die at around 55 to 60C, well before the bread is cooked — nothing living reaches the plate.
Small intestine (B vitamin absorption): Folate, niacin, zinc and biotin from the cell contents are absorbed as part of the bread.
Whole body (Dose-limited contribution): A 7g sachet raises a whole loaf, so any single slice receives a negligible share of these figures.

Time to effect

Not applicable: Used at fractions of a gram per serve, so no meaningful time-to-effect exists.

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, Gluten-free. Depends on the product: Keto, 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: 269
Protein: 36.4g
Carbohydrate: 6.3g
of which sugars: 0g
Fat: 5g
of which saturated: 0.8g
Fibre: 26.9g
Sodium: 170mg

Food vs. supplement

The starkest per-100g-versus-real-intake gap in this database. The folate and zinc figures are genuine and unreachable through bread; leafy greens, legumes and fortified flour are where dietary folate actually comes from.

Kitchen tip

Hydrate dry yeast at 38 to 42C. Hotter kills it, colder slows it. Keep salt off the dry yeast until the flour is mixed in, since direct contact draws water out of the cells.

Common myth

“Yeast in bread is a live culture that benefits the gut.” In reality: Baking kills the yeast at around 55 to 60C, long before the loaf is done. Nothing living reaches the plate. The probiotic yeast with actual trial evidence, Saccharomyces boulardii, is a different strain sold live as a supplement.