A systematic review of observational studies and cohort analyses finds that higher nut consumption, and especially swapping red and processed meat for nuts, is associated with lower chronic kidney disease risk or prevalence in some populations. Results for kidney function markers such as estimated glomerular filtration rate and albuminuria were inconsistent. Nuts also appeared within plant-based dietary indices and biomarker-based analyses, with similarly mixed results. Data in people with established CKD or high-risk groups were sparse.
The substitution finding is the most credible signal here. Replacing red and processed meat with plant protein lowers dietary acid load and phosphorus bioavailability, and large cohorts have linked plant-forward patterns to slower kidney decline, so nuts may be riding a broader dietary shift rather than acting alone. The review's own caveats matter: observational designs invite confounding by overall diet quality, income, and health-seeking behavior, and reverse causation is plausible since people with early kidney disease are often told to limit potassium and phosphorus-rich foods, including nuts. Inconsistent exposure definitions make pooling difficult, and no optimal intake emerges. For adults with healthy kidneys, nuts remain a sensible meat replacement given their cardiovascular evidence. Anyone with advanced CKD should discuss potassium and phosphorus limits with a nephrologist before increasing intake. This is a confirmatory, hypothesis-generating review rather than a practice-changing one; randomized trials with kidney endpoints are the missing piece.