Is fish oil good for CKD?

The renal diet audit, because the question is really whether a fish oil fits a diet that restricts five things

Is fish oil good for CKD is best answered by an audit most omega-3 pages never run, the renal diet's, because a reader with chronic kidney disease lives on a diet that restricts five things and the question is really whether a fish oil fits it. The renal diet restricts potassium, since a failing kidney excretes it poorly and a high level disturbs the heart's rhythm; phosphorus, which accumulates and damages bone and vessels; sodium, for blood pressure and fluid; protein, in the earlier stages, to slow the disease's progression; and, on dialysis, fluid, counted to the millilitre between sessions. An oily fish fillet, the plate's omega-3 source, carries all of the first four in amounts the diet counts, a salmon or mackerel fillet delivering several hundred milligrams of potassium and phosphorus and twenty-odd grams of protein, so the renal dietitian portions oily fish carefully and a CKD reader often eats less of it than the two portions a week that UK advice sets, the low-fish plate that the oily-fish audit sends to a softgel. A fish oil softgel carries none of the five: it is a gram of fat, with no potassium, no phosphorus, no sodium, no protein and no fluid worth counting against a dialysis allowance, so it delivers the 250mg of EPA and DHA that the register's heart-function claim needs without touching a single restriction, which is the renal diet's answer to whether fish oil is good for CKD, a softgel being one of the few things on the supplement shelf a kidney patient can add without a dietitian's subtraction elsewhere, the contrast with magnesium, potassium and phosphate-containing supplements being total.

The files, dialysis and IgA nephropathy, the notes beside heparin and vitamin A, the nephrologist, and the audit filed

The files, since a CKD reader will ask about more than the diet. Dialysis: dialysis patients often carry raised triglycerides, and fish oil at the two-gram claim dose is used to lower them without kidney harm, the kidney literature's summary and the one place the higher rungs enter a CKD reader's picture, at the nephrologist's say. IgA nephropathy: the commonest glomerulonephritis was the subject of fish oil trials at several grams a day for years, with slowed loss of kidney function in some and no effect in others, a mixed file a nephrologist knows, discusses and does not print on any label. Progression in CKD generally: the trials are small and mixed, and no claim exists, the register's omega-3 sentences being heart, brain, vision, triglycerides and blood pressure and nothing renal. The notes: the antiplatelet effect, modest at supplement doses, is mentioned beside the heparin given at dialysis and beside any anticoagulant a CKD reader takes, a prescriber's routine knowledge rather than a warning; and vitamin A handling changes in kidney failure, retinol accumulating as its binding protein is cleared poorly, so a CKD reader takes a body-oil fish oil with no vitamin A and never a cod liver oil, the one product-choice rule the condition adds. The nephrologist sets the dose, as with everything a CKD reader takes, not because omega-3 is dangerous but because a renal regimen is a whole, the standard 250mg softgel usually raising no question and the two-gram triglyceride dose being theirs to decide. The audit filed: a renal diet restricting potassium, phosphorus, sodium, protein and fluid, an oily fish fillet carrying the first four, a fish oil softgel carrying none, dialysis triglycerides lowered without harm, IgA nephropathy mixed, the antiplatelet note beside heparin, a body oil for the vitamin A, and a nephrologist's dose, with the worked example being a body-oil softgel that fits a renal diet, one at 17p, £14.99 for 90.

The verdict, a softgel that fits a diet almost nothing else fits, with the nephrologist's say

Is fish oil good for CKD: safe in it and useful in a way the renal diet makes clear, since a chronic kidney disease diet restricts potassium, phosphorus, sodium, protein and fluid, an oily fish fillet carries the first four in amounts the diet counts, and a fish oil softgel carries none of them, delivering the 250mg heart claim without touching a restriction, with fish oil used in dialysis to lower triglycerides without kidney harm, studied in IgA nephropathy with mixed results, mentioned beside heparin for its antiplatelet effect, taken as a body oil because vitamin A handling changes in kidney failure, and dosed with the nephrologist. A body-oil softgel that fits a renal diet: Futuro Labs Omega 3 Fish Oil, one softgel with food, 180mg EPA and 120mg DHA, no vitamin A, 90 for £14.99 at 17p a day.

What to check on the label

Questions people also ask

Can kidney patients take fish oil?

Yes, with the nephrologist's knowledge: a fat is not filtered or excreted by the kidney and accumulates nothing when function falls, fish oil is used in dialysis patients without kidney harm, and a softgel carries none of the potassium, phosphorus, sodium, protein or fluid a renal diet restricts.

Does fish oil contain potassium or phosphorus?

No: a fish oil softgel is a gram of fat with no potassium, phosphorus, sodium or protein and no fluid worth counting, unlike an oily fish fillet, which carries several hundred milligrams of potassium and phosphorus and is portioned carefully on a renal diet.

Is fish oil used in dialysis?

Yes, to lower the raised triglycerides dialysis patients often carry, at the two-gram claim dose, without kidney harm, at the nephrologist's say and with the antiplatelet effect mentioned beside the heparin given at sessions.

Does fish oil slow kidney disease?

Not on evidence that reaches a claim: trials in IgA nephropathy at several grams a day for years slowed decline in some and not in others, trials in CKD generally are small and mixed, and no renal sentence exists on the register, so it is a nephrologist's conversation rather than a treatment.

Which fish oil should someone with CKD choose?

A body-oil fish oil with no vitamin A, since vitamin A handling changes in kidney failure and cod liver oil's preformed vitamin A accumulates, at a standard softgel unless the nephrologist sets a higher dose for triglycerides.

Sources

1. The omega-3 and chronic kidney disease literature: fish oil has been studied as a treatment in IgA nephropathy and used to lower triglycerides in dialysis patients without evidence of kidney harm, with no association between omega-3 intake and kidney stones or declining kidney function in people with normal kidneys. PubMed record
2. Donadio JV and colleagues: randomised trial evidence on fish oil in IgA nephropathy (Mayo nephrology collaborative group), the classic nephrology omega-3 literature. PubMed record
3. The hypermagnesaemia literature: the kidneys excrete surplus magnesium, so supplementation is safe for healthy adults within guidance and warrants medical advice in chronic kidney disease, where impaired excretion allows magnesium to accumulate. PubMed record
4. EFSA Panel on Dietetic Products. Scientific opinion on the substantiation of health claims related to EPA and DHA and normal function of the heart (250mg daily condition of use). EFSA Journal 2010;8(10):1796. https://www.efsa.europa.eu/en/efsajournal/pub/1796

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