Start with plain, uncoated frozen fish if you need to account for carbohydrate in a keto-oriented meal plan: the named plain-fish labels from Sainsbury's, Tesco and M&S declare 0.4g to 1.1g carbohydrate per 100g, although the Sainsbury's figure is for fish cooked as instructed. Tesco's Birds Eye breaded cod listing declares 21g per 100g, so check the exact pack before choosing a coated product for convenience. A prescribed ketogenic diet requires the individual plan from your clinical team.
If you plan meals around a carbohydrate allowance, compare the exact pack's carbohydrate declaration and ingredients. Tesco's Birds Eye breaded cod listing declares 21g carbohydrate per 100g; the named plain-fish examples from Sainsbury's, Tesco and M&S declare 0.4g to 1.1g per 100g, on their respective label bases.
The fish name alone does not tell you its fat content. Sainsbury's Frozen Basa Fillets ASC declare 1.2g fat per 100g oven-cooked, while M&S Scottish Salmon Portions declare 17.8g per 100g. Check which product and preparation basis fits your plan.
Breadcrumbs, batter and dusting make a coated product a different choice from an uncoated fillet. Tesco's Birds Eye breaded cod example can be cooked from frozen but declares 21g carbohydrate per 100g, so check the pack rather than judging it by cooking method.
Decide which fish format fits your meals, then compare the exact labels on the same preparation basis and check how much usable fish the pack contains.
| Priority | What to check | Your needs |
|---|---|---|
| Carbohydrate and coating | Read carbohydrate per 100g and whether the figure is for fish as sold or cooked. Check ingredients for breadcrumbs, batter, dusting or sauce. | I need the fish to fit my carbohydrate allowance, not just have a convenient cooking format. Sainsbury's basa declares less than 0.5g per 100g oven-cooked; Tesco's Birds Eye breaded cod declares 21g per 100g. |
| Fat profile | Compare fat per 100g on each named pack; do not assume all salmon has the same value. Use the same preparation basis where possible. | If my plan calls for a particular fat intake, the exact fish matters: Tesco Wild Salmon Fillets declare 2.2g fat per 100g, while M&S Scottish Salmon Portions declare 17.8g per 100g. |
| Usable quantity | Check pack weight, any separately stated net weight, glazing and the number or size of portions. | I want to know how much fish I can portion into meals, particularly when a pack distinguishes its total weight from its net weight. |
| Storage and preparation | Follow the pack's frozen-storage, thawing, cooking and refreezing instructions for that product. | I need a preparation method that works for my household without leaving thawed fish improperly stored. The Food Standards Agency notes that thawing followed by storage at higher temperatures can allow surviving microorganisms to grow. |
Coating changes the ingredients and can substantially change the carbohydrate declaration. Tesco's Birds Eye breaded cod listing declares 21g carbohydrate per 100g, unlike the named plain-fish examples.
Check the exact nutrition panel and ingredients before deciding whether a breaded, battered or dusted product fits your plan.
Tesco Wild Salmon Fillets declare 2.2g fat per 100g; M&S Scottish Salmon Portions declare 17.8g per 100g. One salmon label cannot stand in for another.
Compare the fat and carbohydrate lines on the particular pack you intend to use, alongside its stated preparation basis.
The Food Standards Agency reports that thawing followed by storage at significantly higher temperatures can facilitate the growth of surviving microorganisms.
Keep fish at its labelled frozen-storage temperature and follow that pack's instructions for thawing, cooking and refreezing.
These named ranges and packs illustrate differences worth checking; a figure for one product does not describe a brand's entire frozen-fish range.
Its Frozen Basa Fillets ASC 500g are a skinless, boneless plain-fish example.
Its frozen-fish listings include plain fillets and coated products, making the exact pack important.
Scottish Salmon Portions provide another labelled plain-salmon example.
Its Breaded Cod Fillets illustrate a coated frozen-fish choice that can be cooked from frozen.
Young's describes breaded and lightly dusted fish ranges.
Asda's listing for Birds Eye Breaded Cod supplies pack-specific nutrition and allergen information.
These options include frozen fillets, fish slices and catfish. Compare each exact pack's carbohydrate declaration, ingredients and usable quantity before choosing for a keto-oriented meal.
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The individually quick-frozen fillet format may suit meals that call for separate portions. The title distinguishes 1kg total weight from 800g net; check the pack's usable fish weight and carbohydrate declaration for your comparison.
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The two-fillet, 240g pack offers a defined quantity for planning portions. Check its current carbohydrate and salt declarations on the pack before deciding whether it fits your meal plan.
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This pangasius pack distinguishes 1kg from 800g net, a detail to check when planning portions. Confirm the net fish weight, ingredients and carbohydrate declaration on the exact pack.
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Choose the sliced format if it suits the way you prepare fish. Check the pack's carbohydrate declaration and whether its nutrition values refer to fish as sold or as prepared before comparing it with fillets.
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The 1kg pack is an option if that quantity suits your planned meals. Check its ingredients, carbohydrate declaration and preparation basis on the exact label, then follow its storage and cooking instructions.
It can if the exact product's carbohydrate declaration fits your plan. Sainsbury's basa declares less than 0.5g per 100g oven-cooked, Tesco Wild Salmon Fillets declare 1.1g per 100g and M&S Scottish Salmon Portions declare 0.4g per 100g. Check other packs individually rather than applying these figures to all plain fish.
Not without checking the carbohydrate allowance for your meal. Tesco's Birds Eye Breaded Cod listing declares 21g carbohydrate per 100g and includes a breadcrumb coating; the named plain-fish examples have different declarations. Read the exact pack's nutrition panel and ingredients, including for products described as lightly dusted.
Start with the ingredients and carbohydrate and fat declarations that matter to your plan, then check the usable fish weight and portion format. Where a pack gives both total and net weight, use the distinction when working out how many meals it will provide.
Follow the thawing, storage, cooking and refreezing instructions on that pack. The Food Standards Agency reports that thawing followed by storage at significantly higher temperatures can allow surviving microorganisms to grow; do not leave thawed fish at room temperature.
Use the individual plan from your dietitian or specialist team instead of general shopping comparisons. Great Ormond Street Hospital describes its ketogenic diet therapy as carefully calculated for each child according to factors including age, growth and activity.