Cornflakes
How long it keeps
About 6 months unopened
Once opened, about 60 days.
Source: FoodKeeper (USDA), 374 Cereal, ready-to-eat, 6–12 Months · https://catalog.data.gov/dataset/fsis-foodkeeper-data
What ends it. It takes up water from the air, which is what makes it cake, soften or grow mould. How to make it last longer
Storage
Cool, dry, and sealed once open, because they go soft rather than stale. Note the volume: 500 g of cornflakes is about 2.6 litres, which is most of a rucksack pocket for very little food. They crush into a coating, bulk out a crumble topping, and go into a tin of fruit as a pudding.
The pack
- Typical UK size
- 500 g
- Weight packed
- 520 g
- Volume
- 2600 ml
Computed from net weight and standard pack geometry, not weighed. Manufacturers publish net weight and nobody publishes packed weight or displaced volume, so this is an estimate and is labelled as one.
Per 100 g
Deliberately narrow. These are the five things a long-life diet actually gets wrong, plus energy and protein. It is not a general nutrition model and is not meant to be.
- Energy
- 376 kcal
- Protein
- 7.1 g
- Fibre
- 2.6 g
- Vitamin C
- 0 mg
- Vitamin A
- 21 µg
- Omega-3
- 0.01 g
- Sodium
- 450 mg
Source: CoFID 2021, 11-742 Breakfast cereal, cornflakes, fortified