Home / Health / Daily Walnuts Linked to Better Mood, Serotonin Changes
Daily Walnuts Linked to Better Mood, Serotonin Changes
4 Oct
Summary
- Daily walnut intake reduced overall mood disturbance in young adults.
- Urinary levels of serotonin breakdown product 5-HIAA significantly increased.
- Gut-derived urolithins A and B also showed increased levels.
Eating a daily handful of walnuts may positively influence mood and alter serotonin metabolism, according to a recent study involving young adults. Over an eight-week period, participants who consumed 40 grams of walnuts daily reported lower overall mood disturbance.
This dietary change was associated with significant increases in urinary 5-hydroxyindoleacetic acid (5-HIAA), a key indicator of serotonin metabolism. Additionally, levels of urolithin A and urolithin B, compounds produced by gut bacteria processing walnut components, also rose during the walnut consumption phase.
Researchers suggest these findings point to a connection between walnut intake, gut microbiome activity, and mood. The study highlights the role of omega-3 fatty acids, tryptophan, fiber, and polyphenols found in walnuts. However, it emphasizes that walnuts are not a cure for depression and that the observed changes in 5-HIAA reflect bodily serotonin metabolism, not necessarily direct brain serotonin activity.
The recommended daily amount in the study was 40 grams, about a generous handful. Walnuts can be easily incorporated into meals by adding them to breakfast foods, salads, or smoothies as a nutritious snack alternative.
