Health · Medical Research · 4 hrs ago
Two-year walnut study finds higher IgG levels in older adults
A two-year study linked daily walnut eating to higher IgG levels in adults aged 63 to 79 in Spain and the United States.
IgG is a type of antibody, a protein involved in the body’s immune response.
In the trial, participants were assigned either to eat 30 to 60 grams of walnuts each day or to follow a diet without walnuts.
The walnut group had about 6% higher total IgG than the control group after two years.
The researchers also examined antibodies related to modified LDL, which is connected to plaque formation in blood vessels, but the reported result does not establish a health benefit.
The clinical meaning of the IgG difference remains uncertain, and the study does not show that walnuts prevent heart disease.
The findings point to a possible link between diet and immune markers, but further research would be needed to clarify its importance.
A two-year analysis of older adults in the WAHA trial linked daily walnut consumption to total serum IgG levels approximately 6% higher than in controls.
The study included participants in Spain and the United States.
Participants assigned to the walnut diet ate 30–60 grams daily.
Researchers analyzed immune biomarkers in samples from 474 participants.
The clinical implications of the higher IgG levels remain uncertain.
- Who
- Cognitively healthy adults aged 63 to 79 in the WAHA trial.
- What
- Researchers found that walnut consumption was associated with total serum IgG levels approximately 6% higher than in controls after two years.
- When
- Participants enrolled between May 2012 and May 2014 and followed the diets for two years.
- Where
- The United States and Spain.
- Why
- Researchers investigated whether walnut consumption affected immune biomarkers, including total IgG and antibodies targeting MDA-LDL.
This story does not have two clearly opposing sides.
Participants enrolled in the trial and were assigned to a walnut-based or walnut-excluding diet.
Researchers compared immune biomarker results from participants in the two diet groups.
- Participants
- 708 cognitively healthy adults aged 63 to 79 enrolled in the WAHA trial
- Diet duration
- Two years
- Walnut intake
- 30–60 grams daily in the intervention group
- Biomarker sample
- 474 participants: 240 in the walnut group and 234 controls
- IgG result
- Approximately 6% higher in the walnut group than in controls at two years