Holiday Dinner Lit Matters 2: Go Easy on the Gravy

Dietary sodium restriction in chronic heart failure has weaker evidence than many clinicians assume. In this Lit Matters review, a 2024 systematic review and meta-analysis found no clear mortality benefit and raised concern for higher heart-failure hospitalization and worse composite outcomes with strict low-sodium diets.

Sodium Restriction in Chronic Heart Failure

• Common 2-gram dogma: A 2 g/day sodium target is widely recommended in CHF, but the physiologic promise of less fluid retention has not translated into convincing clinical benefit in contemporary data.
• Systematic review signal: Using PRISMA methods, the authors narrowed roughly 9,000 papers to 9 studies and 2,210 patients, underscoring how thin the high-quality evidence base really is.
• Mortality outcome uncertainty: Across 8 studies, sodium restriction showed no statistically significant reduction in all-cause mortality, with point estimates drifting toward harm rather than benefit.
• Hospitalization concern: Heart-failure hospitalization was more common in the sodium-restricted groups, a clinically important signal that challenges routine advice to simply cut salt harder.
• Composite harm finding: In 3 studies, the combined endpoint of death or readmission favored a more liberal sodium approach, with an odds ratio of 4.12 against restriction. We get into why that effect should still be interpreted cautiously in the episode.
• Modern therapy contrast: SGLT2 inhibitors remain a cornerstone of guideline-directed heart-failure therapy, highlighting that sodium handling may matter more when modified pharmacologically than through rigid dietary restriction alone.