Walnut nutrients and their effects on human health outcomes
What it found
Walnut components like alpha-linolenic acid were linked to lower fatal heart attack rates in people.
In lab tests, walnut compounds protected brain cells from inflammation and showed anticancer activity.
What they found
Studies in people
Heart attacks in people
Alpha-linolenic acid, a key part of walnuts, was linked to fewer fatal heart attacks in people. The authors suggest this may be due to an effect on heart rhythm.
Heart and metabolism health
Minerals in walnuts that are not sodium were associated with better heart and metabolic health in people.
Animal and lab studies
Brain cell inflammation
In lab tests, alpha-linolenic acid from walnuts protected microglial brain cells from inflammation. This nutrient is broken down into active compounds called oxylipins.
Anticancer effects
A compound called phytomelatonin in walnuts showed anticancer effects in lab tests. Main walnut polyphenols and their breakdown products, ellagitannins and urolithins, shared these effects.
Studies in people and animals
Cholesterol levels
Phytosterols found in walnuts are linked to the cholesterol-lowering effect seen when people eat nuts.
What the authors conclude
- They highlight new evidence showing that walnuts and their main nutrients promote health.
- They conclude that walnuts are optimal healthful foods based on the studies they examined.
How it was done
Nuts, especially walnuts, are increasingly linked to better health outcomes. Recent studies have uncovered how specific walnut nutrients affect body processes and clinical results.
The authors gathered recent clinical and experimental studies on walnut micronutrients. They looked at how these nutrients work alone or together to influence metabolic pathways and health outcomes.
What it can’t tell you
- We summarised it from the abstract only.
- This work gathers past studies rather than testing walnuts directly in a new trial.
- Lab findings on brain cells and cancer cannot show what happens inside the human body.
- Links between walnut nutrients and health outcomes do not prove that walnuts caused those benefits.
Who paid
- Authors work at
- Institut d'Investigacions Biomèdiques August Pi Sunyer, Barcelona; Instituto de Salud Carlos III (ISCIII), Madrid; University of Barcelona, Spain
The paper
- Title
- Beneficial effects of walnut consumption on human health: role of micronutrients
- Type
- ReviewThe authors read earlier studies and describe what they found. It isn’t a new study.
- Evidence
- Studies in people · animals · lab
- Summarised from
- Abstract only
- Cite
- Ros E, Izquierdo-Pulido M, Sala-Vila A (2018). Beneficial effects of walnut consumption on human health: role of micronutrients. Current opinion in clinical nutrition and metabolic care. doi:10.1097/MCO.0000000000000508PubMed 30199393DOI
Summary written 30 Sep 2026. Check it against the paper before it changes what you eat. How we summarise papers · Report an error