Weet-Bix
Food · Grain · Food, Typed Supps
A high-fibre, low-sugar way to start the day, especially compared with most boxed cereals.
Stage by stage
- Intake (Softened by milk & chewing): Chewing and milk soften the compressed wheat biscuit’s dense fibre structure.
- Stomach (Starch digestion begins): Stomach acid and enzymes begin breaking down the starch inside the biscuit.
- Small intestine (Fibre slows absorption): Wheat bran fibre slows glucose absorption while iron and B vitamins are absorbed alongside it.
- Bloodstream (Steadier blood sugar): The result is a steadier, more gradual blood sugar rise than a low-fibre cereal.
Timing
Eaten with milk at breakfast; the fat and protein in the milk further slow the glucose response.
Time to effect
- Same meal: Produces a steadier blood sugar rise than a low-fibre, high-sugar cereal of the same size.
Allergens
Contains: Gluten. Derived from what this food is, not from a product label.
Eating patterns
Fits: Vegan, Vegetarian, Pescatarian, Halal, Kosher. Depends on the product: Low-FODMAP.
Satiety
156 on the satiety index, where white bread is 100 — high. Modelled from the Holt et al. (1995) measurements.
Environmental footprint
1.6 kg CO2e and 648 litres of freshwater per kg, matched to "Wheat & rye" in Poore & Nemecek (2018), Science 360.
Cost band
Cheap — roughly £2.5 per kg, as a band midpoint rather than a price.
Key nutrients
Nutrition per 100g
- Calories: 363.5
- Protein: 12.5g
- Carbohydrate: 56.5g
- of which sugars: 7.9g
- Fat: 5.6g
- of which saturated: 3g
- Fibre: 17.5g
- Sodium: 362mg
Food vs. supplement
The wheat bran fibre here works because it’s still structurally intact — a fibre supplement added to a low-fibre food doesn’t slow digestion the same way a compressed wholegrain biscuit does.
Kitchen tip
Add the milk a minute or two before eating so the biscuit softens through rather than staying dry in the middle.
Common myth
"All breakfast cereal is basically the same once you add milk." In reality: Fibre content varies enormously between cereals — a compressed wholewheat biscuit like this carries several times the fibre of a typical flake or puffed cereal, which measurably changes how it affects blood sugar.
Recipes that use it
More in Grain
In the glossary
Sources