A clinical intervention study published in Clinical Nutrition (2025) has identified a simple dietary strategy for supporting brain health in aging populations. Researchers found that consuming 60 grams of skin-roasted peanuts daily improved global cerebral blood flow by approximately 4% in older adult participants. This modest but meaningful improvement is physiologically equivalent to reversing roughly 10 years of age-related cognitive decline in cerebral perfusion.
The mechanism underlying this benefit appears to centre on arginine, a semi-essential amino acid present in peanuts at concentrations of 1.8–2.0 grams per serving. Arginine serves as a substrate for nitric oxide synthesis, triggering vasodilation in cerebral vessels and enhancing oxygen delivery to brain tissue. The findings suggest that targeted dietary interventions may offer a practical, evidence-based approach to maintaining cognitive function during aging.
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