Does Dried beans and pulses expire?
Dry beans are stable for years — they are simply dehydrated seed — and nothing dangerous develops in them. What changes is the cell wall chemistry: as they age and dry further, pectin cross-links and the beans resist rehydration, so cooking time stretches from an hour to several, and beans more than a few years old can stay stubbornly gritty however long they are simmered. Soaking longer and cooking with a pinch of bicarbonate of soda helps, and a pressure cooker helps more. Red kidney beans carry a separate rule that has nothing to do with age: raw or undercooked they contain enough phytohaemagglutinin to cause violent vomiting, so they must be boiled hard for at least ten minutes.
How to store it
- Airtight, cool, dark and dry.
How to tell it has gone
- Beans that will not soften after hours of simmering are old, not dangerous.
"Use by" and "best before" are legally different. Use-by is a safety date and should be respected; best-before is about quality, and food is usually fine well past it. Where the two diverge matters, the page above says which applies.
Common questions
- Does Dried beans and pulses expire?
- Safe indefinitely, but old beans get harder to cook and some never soften at all.
- How long does Dried beans and pulses last?
- Safe indefinitely; best cooking quality within 2-3 years
Related pages
- Does Frozen food expire? Food held continuously at −18 °C is safe indefinitely. The dates are about quality only.
- Does Canned food expire? An intact, undamaged can is safe more or less indefinitely. Quality is the limit, not safety.
- Does Hard cheese expire? Cut the mould off hard cheese and eat the rest. This does not apply to soft cheese.
- Does White rice (uncooked) expire? Effectively no, if it stays dry. Brown rice is the opposite — it goes rancid within months.
- Does Spirits (whisky, vodka, gin, rum) expire? Unopened, indefinitely. Once opened, oxidation slowly flattens the flavour over a year or two — it never becomes unsafe.
- Does Dried pasta expire? Plain dried pasta keeps for years. Egg pasta is the exception and has a real date.
- Does Motor oil expire? Sealed oil keeps for years. Oil in an engine is limited by contamination and by time, not by mileage alone.
- Does Soy sauce expire? Practically never in a sealed bottle — the salt content sees to that. Opened, it darkens and flattens over months.
- Does Honey expire? Does not expire
- Does Eggs expire? Degrades in quality
- Does Medicines expire? Degrades in quality
- Does Milk expire? Has a real expiry date
- Does Sunscreen expire? Unsafe or ineffective after the date
- Does Salt expire? Does not expire
Sources
- US Food and Drug Administration — FDA (Public domain (US Government))