Daily blueberry consumption shows mixed mood results in older adults
A small study from Hebrew SeniorLife published on October 18, 2026, found that daily blueberry intake altered gut enzymes but did not produce statistically significant mood improvements compared to a placebo.
Study findings on depressive symptoms
Participants who ate blueberries regularly reported greater and more consistent reductions in depressive symptoms. Researchers noted these changes occurred alongside subtle shifts in genes linked to gut microbial enzymes. However, the data did not show a statistically significant difference between the fruit group and the placebo group.
Potential gut-brain connection
The research team detected specific changes in gut microbial enzymes during the three-month trial period. These findings suggest a possible link between diet, gut bacteria, and mental health outcomes. The study authors state that these results offer preliminary clues rather than proof of a cure.
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