What’s the first word that comes to mind when you hear ‘tuna’?
Fish? Tasty? Protein? John West? For some people, it’s mercury.
That’s because, ‘How worried should you be about mercury in your tuna?’ is a question that’s been popping up online for years.
For those who don’t know, mercury is a metal that can be found naturally in the environment, but also in some foods, such as fish. Depending on the type and amount, exposure to mercury can cause significant health problems.
The good news for seafood lovers is, most fish only contain small traces of mercury. The amount found in tinned tuna is especially low, making it one of the best choices for individuals looking to limit their exposure.
Is mercury in tuna something to worry about?
There’s that question again.
Mercury in tuna isn’t something you necessarily need to be ‘worrying’ about, but when it comes to our health and well-being it’s always good to have all the facts.
John West canned tuna is routinely tested and monitored for mercury and other potential environmental contaminants. The levels of mercury we are able to detect are very low and well within the maximum levels permitted under EU/UK legislation.
The UK Food Standards Agency does recommend that if you are trying for a baby, or are pregnant, then you should eat no more than the equivalent of four cans of tuna a week.
Can you eat tuna every day?
Packed with protein, essential vitamins and minerals, and omega-3 acids, tuna is a nutrient-rich fish that is as delicious as it is good for you.
Too much of a good thing isn’t always a good thing, though. So, what about tuna? Can you eat it every day?
According to the NHS, a healthy, balanced diet should include at least two portions of fish a week. There’s nothing there to suggest that you can’t eat tuna every day, unless you’re trying for a baby, or pregnant.
Is tinned tuna lower in mercury content than fresh tuna?
Tinned tuna, generally, contains less mercury than fresh tuna because it’s made from smaller fish that are typically younger when caught. This isn’t the only difference between canned and fresh tuna:
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Tinned Tuna |
Fresh Tuna |
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Mercury levels Protein (per 100g) Calories (per 100g) Fat (per 100g) Prep time / convenience Shelf life |
Generally lower, especially in smaller species like skipjack. 27g 113 kcal 0.5g Ready to eat straight out of the can. Ideal for sandwiches, salads and pastas. Months/years. |
Generally higher, especially in large species like albacore and yellowfin. 24g 145 kcal 0.5g – 1.5g Requires preparation and cooking (10 – 20 minutes). 1 – 2 days. |
Is tinned tuna good for children?
John West tuna is one of the healthiest canned fish you can eat – for all the family.
Whether you’re wanting your youngsters’ packed lunch to pack a bigger protein punch, or your fussy feasters are demanding a new mealtime menu, tuna is an ideal addition.
That’s because John West tuna isn’t just brimming with nutrients and flavour, it’s also a busy parent’s dream.
Ready to eat in seconds, it can be added to sandwiches, pastas and salads, or enjoyed all on its own.







