Mackerel (canned)

Why mackerel (canned) is rated low

Canned mackerel is low FODMAP at Any typical portion, a rating estimated from what it is made of rather than from a measured serving. The fish itself is protein and fat with essentially no carbohydrate, so it contributes no FODMAPs. That leaves the packing liquid as the part to check. Water, brine and plain oil add nothing to worry about, but a flavoured sauce in the tin can bring in ingredients that the fish does not have.

What changes your risk

• What it is packed in Spring water, brine and plain oil keep it simple. Tomato, curry, chilli and other flavoured sauces can list onion, garlic or a seasoning blend, so a sauced tin needs its label read.
• Draining the tin In canned legumes and vegetables, water-soluble FODMAPs leach into the canning liquid, so draining and rinsing really does lower them. Mackerel has no FODMAPs of its own to lose, so draining only pours off the brine or oil. It cannot strip out onion or garlic from a sauce that coats the fish.
• Spreads and pâtés Smoked mackerel pâté and fish spreads are often blended with cream cheese or cream, which are not low FODMAP, so they do not share the rating of plain fish.
• The rest of the plate Mackerel on ordinary wheat toast with a creamy dressing makes a higher FODMAP meal even though the fish itself is low. The rating covers the mackerel, not the whole plate.
• Portion Any typical portion is the only rung on the ladder. Unusually large amounts fall outside what the estimate describes.

What else works

Other plain canned fish sit in the same low spot when packed in water, brine or oil, including sardines, salmon and tuna, and fresh or frozen plain fish fits too. The lookalikes that are not automatically low all have something added: mackerel in a tomato or curry sauce with onion or garlic on the label, smoked mackerel pâté made with cream cheese, and fish cakes bound with wheat breadcrumbs.

How to keep it low

In the shop, pick tins labelled in spring water, brine, olive oil or sunflower oil, and read the full ingredient list on any flavoured tin for onion, garlic or a seasoning blend. At home, drain off the liquid, flake the fish and add flavour yourself: lemon juice, chives, black pepper or garlic-infused oil. It works well over rice with cucumber and carrot, folded through gluten free pasta, or on traditional sourdough spelt toast. Once a tin is opened, move any leftovers into a covered container in the fridge and use them soon.

Common questions

is canned mackerel low fodmap

Yes, plain canned mackerel is low FODMAP at Any typical portion. The rating is estimated from what it is made of, which is fish with essentially no carbohydrate, so check the packing liquid and any sauce rather than the fish itself.

is mackerel in tomato sauce low fodmap

It depends on the label. Tomato sauces in tins can include onion or garlic, so choose mackerel packed in water, brine or oil and add your own flavours if the sauce lists either.

should i drain canned mackerel

Draining pours off the brine or oil, which is fine either way. It cannot remove onion or garlic from a sauce that coats the fish. Draining makes a real difference with canned legumes and vegetables, where FODMAPs leach into the liquid.

is smoked mackerel pate low fodmap

Not reliably. Many pâtés are blended with cream cheese or cream, which are not low FODMAP, so plain canned or smoked mackerel fillets are the safer base.