Value Village ／ Food & living
This answer is a draft. It stays unpublished until legal review and source verification are complete.
If you live in Japan, you will probably buy white rice in large bags. The common assumption is that rice keeps at room temperature indefinitely. The answer from the Ministry of Agriculture, Forestry and Fisheries (MAFF) is "about one month after milling".
In hot, humid conditions, high temperature speeds up oxidation, high humidity encourages mould, and insects become more active.
[Verify] The one-month guide is based on MAFF's "Kodomo Sōdan" (children's questions) page. Check the original before publication.
Retail rice bags often have small air holes. Moving the rice to a sealable container is better suited.
Under the sink is where damp collects. The basics are to avoid heat, humidity and direct sunlight. A cool place such as the vegetable drawer of the fridge is generally described as extending storage compared with room temperature.
The longer rice is stored, the more its quality changes. Buying what you can eat in a month means you end up eating it in better condition.
Flavour changes with time. You can adjust, for example by changing the amount of water, but it does not go back to how it was.
Insects are generally described as appearing especially in summer. Sealing and cool storage are the countermeasures.
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https://www.maff.go.jp/j/heya/kodomo_sodan/0006/01.html
https://www.maff.go.jp/j/seisan/kikaku/
https://www.caa.go.jp/policies/policy/food_labeling/
⚠️ Editorial note: the source URLs above were identified by search. Our working environment cannot reach go.jp domains, so the contents have not been checked against the text. Verify every source before publication and record who checked it and when.
What we share here are ideas and everyday practices passed down among people living in Japan, together with general information drawn from public sources. They are not official recommendations, and they are not professional instruction. Practices vary between households and regions.
This is general information. Results vary from person to person and depend on your own conditions and surroundings.
Please decide for yourself, using your own judgement, whether any of this suits your situation. We cannot accept responsibility for any damage, loss or injury arising from following this article.
If the rice seems off in any way, do not eat it.
Some ingredients need thorough cooking. Eat raw only foods that are sold for raw consumption. If you have allergies, check the ingredients.
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