---
title: Walnuts & Lipids
description: "The results of a 2-year randomized controlled trial were recently published in Circulation. Known as the WAHA study (Walnuts and Healthy Aging), it documented the effects of adding walnuts into the diet of a population of healthy elderly adults in California and Spain. Over 600 participants (aged 63-79 without comorbidities) either avoided walnuts entirely or consumed approximately 15% of their daily caloric intake as walnuts (30-60 g/d).
After 2 years, the walnut diet resulted in significant decreases in total cholesterol, LDL-C, and intermediate-density lipoprotein cholesterol, with reductions of 4.4%, 3.6%, and 16.8% respectively."
---

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# [Walnuts & Lipids](https://info.bioticsresearch.com/researchforum/walnuts-and-lipids)

 Written by [The Biotics Research Team](https://info.bioticsresearch.com/researchforum/author/the-biotics-research-team) | Sep 20, 2021 4:19:44 PM

The results of a 2-year randomized controlled trial were [recently published](https://pubmed.ncbi.nlm.nih.gov/34455809/) in *Circulation*. Known as the WAHA study (Walnuts and Healthy Aging), it documented the effects of adding walnuts into the diet of a population of healthy elderly adults in California and Spain. Over 600 participants (aged 63-79 without comorbidities) either avoided walnuts entirely or consumed approximately 15% of their daily caloric intake as walnuts (30-60 g/d).

After 2 years, the walnut diet resulted in significant decreases in total cholesterol, LDL-C, and intermediate-density lipoprotein cholesterol, with reductions of 4.4%, 3.6%, and 16.8% respectively. Additionally, total LDL particles and small LDL particle number dropped by 4.3% and 6.1%, respectively. A reduction in non-HDL cholesterol, particularly the more atherogenic LDL particles, indicates a small but [significant reduction in cardiovascular disease risk](https://pubmed.ncbi.nlm.nih.gov/29760220/), more meaningful than a standard LDL-C reduction.

The strengths of this study are its larger population size and longer duration, as well as its real-world results; these were free-living healthy adults living in different parts of the world choosing their own diets, showing a clear benefit for the simple addition of walnuts each day. The cardiovascular risk reduction parallels the benefits previously reported for nut consumption and [lower cardiovascular mortality](https://pubmed.ncbi.nlm.nih.gov/31361320/), as well as the associated [broad improvements in lipids](https://pubmed.ncbi.nlm.nih.gov/29931130/) from a walnut-enriched diet, without an adverse impact on weight or blood pressure.

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