Tuna: Every Food Safety Answer
Written by Jordan Morley · Reviewed against NHS, FSA and USDA FoodKeeper guidance · Last updated 28 October 2026
This page pulls together the 6 tuna answers on the site: how long it keeps, whether you can reheat it, where it stands in pregnancy and what applies while breastfeeding. The table gives the short answer for each; the page behind each row gives the full reasoning, the source and the exceptions.
In pregnancy: Tuna is safe during pregnancy in limited amounts — no more than 2 tuna steaks or 4 medium cans a week, because of its mercury content.
Quick answers
| Question | Short answer | Full answer |
|---|---|---|
| Can you eat it when pregnant? | 🟡 Limit — 2 steaks or 4 cans a week | Tuna when pregnant? |
| While breastfeeding? | 🟡 No limit per NHS, but two NHS pages differ on fresh tuna | Tuna when breastfeeding? |
| How long does it last? | 🧊 3–4 days in the fridge; 2–5 years in the cupboard | How long does tinned tuna (opened) last? |
More on tuna: pregnancy
More on tuna: breastfeeding
More on tuna: reheating
Questions people ask about tuna
Each question is answered in full on the page it links to.
Safer or related choices to tuna
Similar foods in pregnancy
Related foods and topics
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Tuna storage essentials
Airtight food storage containers
The right storage genuinely extends how long tuna stays at its best.
Check Price →Fridge thermometer
Safe storage times assume a fridge at 0–5°C — check yours actually is.
Check Price →Digital food thermometer
75°C in the middle answers both 'is it cooked?' and 'is it reheated?'.
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General information only, not medical advice: see the medical disclaimer. Feeling unwell after eating something? Contact NHS 111 or your GP.