Can You Eat Tinned Tuna When Pregnant?
Written by Jordan Morley · Reviewed against NHS foods-to-avoid guidance · Last updated 28 October 2026
Tinned tuna is safe during pregnancy up to 4 medium cans a week (NHS limit, due to mercury).
Why is tinned tuna a concern in pregnancy?
The NHS advises no more than 4 medium-sized cans of tuna (about 140g drained weight each) per week during pregnancy, because tuna contains more mercury than most fish. Within that limit, tinned tuna is a convenient, healthy protein source. It doesn't count towards the oily fish limit, because the NHS says fresh and canned tuna are not classed as oily fish.
You can also check the calorie content of tinned tuna alongside its safety information. Also check medication safety during pregnancy if you're managing any conditions.
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Check Price →Tinned Tuna: the other answers on this site
| Question | Short answer (links to the full page) |
|---|---|
| While breastfeeding | Safe |
| In the fridge (Tinned Tuna (Opened)) | 3–4 days in the fridge; 2–5 years in the cupboard |
Common questions
Can I eat tinned tuna in the first trimester?
Yes — the 4-can weekly limit applies throughout pregnancy.
Is a small amount of tinned tuna OK during pregnancy?
Yes — a tuna sandwich or tuna pasta within the weekly limit is completely fine.
I accidentally ate tinned tuna while pregnant — what should I do?
One week over the limit is nothing to worry about — mercury concerns relate to sustained intake. Just get back within the limit.
Is cooked tinned tuna safe in pregnancy?
The limit is the same whether the tuna is eaten cold from the can or cooked into a dish.
Related answers
Primary source: NHS foods-to-avoid guidance.
General information only, not medical advice: see the medical disclaimer. Feeling unwell after eating something? Contact NHS 111 or your GP.