Best before

BEST bi-FOR /best bɪˈfɔː/
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What it really means

A quality date on food packaging: the food is at its best before this date but is usually still safe to eat after it — it may just taste less fresh. Different from "use by", which is about safety.

Chinese explanation
包装上的"最佳赏味期":此日期前口感最佳,过期后通常仍可安全食用,只是没那么新鲜。和关乎安全的"use by"(保质期限)不同。

Context, tips & common mistakes

Unlike use-by, best before is about quality, not safety: a biscuit past its best-before date may be less crisp, but eating it is fine, and shops are legally allowed to sell food past this date. Knowing the difference saves real money — 'yellow sticker' shelves and surplus-food apps lean heavily on short-dated and past-best-before items, and several supermarkets have removed best-before dates from fresh produce entirely to cut waste, trusting shoppers to judge for themselves. The confusion runs both ways: some newcomers bin perfectly good food at the best-before date, while others treat use-by dates with the same casualness, which is the dangerous direction. A simple rule holds: best before, use judgement; use by, obey. Eggs are the famous edge case — British advice allows eating them shortly after the best-before date if cooked thoroughly. When in doubt about a specific food, the Food Standards Agency's guidance is written for exactly these questions.

Example conversation

A: These biscuits are past their best before date. B: They'll be fine — best before is about quality, not safety.
A:这些饼干过了最佳赏味期。 B:没事的——best before 只关乎口感,不是安全问题。

What you could say back

“Good to know the difference.”

Related phrases

Official sources

Rules and amounts change — confirm important details with the official source.
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Reviewed by the UK Decoded editorial team · Last checked 24 July 2026 · Report a mistake