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High phenolic early harvest extra virgin olive oil shows notable improvement in cognitive function compared to a moderate phenolic version and the Mediterranean diet alone.
A randomized prospective study was conducted examining the effects of high phenolic early harvest extra virgin olive oil (HP-EH-EVOO) and moderate phenolic extra virgin olive oil (MP-EVOO) against the Mediterranean Diet (MeDi) in individuals with mild cognitive impairment. Participants were genetically tested for susceptibility to Alzheimer's disease and had their cognitive functions tested at the start and after 12 months. They were then randomly put into one of three groups: those who received HP-EH-EVOO, those who received MP-EVOO, and those who only received instructions on following the MeDi.
The results showed that participants who consumed HP-EH-EVOO demonstrated better cognitive performance in almost all areas over the course of the study, compared to those who consumed MP-EVOO and those who followed the MeDi. MP-EVOO consumers also demonstrated noticeable cognitive improvement compared to the MeDi group, who exhibited worse or similar cognitive performance to their baseline in almost all areas. Moreover, participants who consumed either form of olive oil performed better in cognitive tests, regardless of their predisposition to Alzheimer's disease.
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Consumption of wild blueberries over six months can improve cognitive performance and speed of processing information amongst older adults.
2022 Nutritional Neuroscience Six-month intervention with wild blueberries improved speed of processing in mild cognitive decline: a double-blind, placebo-controlled, randomized clinical trial. Cheatham CL, Canipe LG, Millsap G, Stegall JM, Chai SC, Sheppard KW, et al.
Randomised Controlled Trial Cognitive Function
The methodology of this research involved conducting a double-blind, randomized placebo-controlled trial where participants with cognitive issues ascertained by Montreal Cognitive Assessment scores were asked to consume wild blueberry or placebo powder daily for a 6-month period. There was also a separate reference group involved, comprised of individuals devoid of any cognitive issues. These individuals were tested at the commencement and end of the trial using the Cambridge Neurological Test Automated Battery and an electrophysiological paradigm named event-related potentials.
The results presented disclosed a significant improvement in the speed of processing information in the group consuming blueberries compared to the placebo group over the 6-month intervention period. Additionally, the speed of this group's processing was re-established to the level of the reference group, revealing the restoration of cognitive abilities. The most distinct enhancement was noted in participants aged between 75-80 years in the blueberry group.
Jujube nutrients may offer potential therapeutic benefits including antioxidant, antibacterial, anti-inflammatory functions, and improving sleep quality and learning.
2022 Journal of Agricultural and Food Chemistry Wild Jujube (Ziziphus jujuba var. spinosa): A Review of Its Phytonutrients, Health Benefits, Metabolism, and Applications Hua Y, Xu X, Guo S, Xie H, Yan H, Ma X, et al.
Review Article Anti-Inflammatory Antibacterial Antioxidant
The methodology used for this study involves a comprehensive review of existing research about Wild jujube, giving particular focus on its phytonutrients, biological functions, metabolism of bioactive compounds, and applications. The study does not seem to detail a specific experimental procedure, but instead bases its conclusions on existing literature. Various parts of the wild jujube plant, such as the fruits, seeds and leaves, were examined for their potential role as food, medicine, or health care aids.
The results from the review suggest that the different parts of the wild jujube plant play many roles. The fruits have been noted for their antioxidant, antibacterial, and anti-inflammatory properties, and as ingredients preventing aging. The mature seeds have been found to have potential beneficial effects on central nervous system diseases, particularly in the treatment of insomnia and the enhancement of learning and memory.
These reports suggest the benefits of a walnut-enriched diet in brain disorders and in other chronic diseases, due to the additive or synergistic effects of walnut components for protection against oxidative stress and inflammation in these diseases.
2020 Nutrients Beneficial Effects of Walnuts on Cognition and Brain Health Chauhan A, Chauhan V.
Systematic Review Alzheimer's Disease Brain Health Cognitive Function
Walnuts contain several components that have antioxidant and anti-inflammatory effects. Animal and human studies from our and other groups suggest that supplementation with walnuts in the diet may improve cognition and reduce the risk and/or progression of mild cognitive impairment and Alzheimer's disease.
Furthermore, several animal and human studies have suggested that walnuts may also decrease the risk or progression of other brain disorders such as Parkinson’s disease, stroke, and depression, as well as of cardiovascular disease and type 2 diabetes. Together, these reports suggest the benefits of a walnut-enriched diet in brain disorders and in other chronic diseases, due to the additive or synergistic effects of walnut components for protection against oxidative stress and inflammation in these diseases.
Daily consumption of decaffeinated green tea catechins may enhance working memory.
2020 Molecules Effect of Daily Intake of Green Tea Catechins on Cognitive Function in Middle-Aged and Older Subjects: A Randomized, Placebo-Controlled Study Baba Y, Inagaki S, Nakagawa S, Kaneko T, Kobayashi M, Takihara T
Randomised Controlled Trial Cognitive Function Green Tea Catechin Memory
The study incorporated a double-blind, randomized, controlled approach to determine the effects of 336.4 mg of decaffeinated green tea catechins on cognitive function. It targeted Japanese adults, aged 50 to 69 years, exhibiting a Mini-Mental State Examination Japanese version score of over 24 and who self-identified as having cognitive decline. The experiment comprised administering a substance and then examining the cognitive function post a single dosage as well as following 12 weeks of everyday consumption. The Cognitrax testing battery was utilized to assess cognitive function.
In the results, it was observed that the incorrect response rate on the Continuous Performance Test significantly fell after a single dosage of green tea catechins. After 12 weeks of regular intake, the response duration for the two-back test in Part 4 of the 4-part Continuous Performance Test reduced, indicating potential improvement in working memory. The data suggests that consuming green tea catechins daily may potentially lead to cognitive enhancements, particularly in working memory.
Daily avocado consumption improves attentional inhibition and increases serum lutein concentrations, irrespective of changes in lutein status, in adults with obesity.
2020 International Journal of Psychophysiology Effects of 12-week avocado consumption on cognitive function among adults with overweight and obesity Edwards CG, Walk AM, Thompson SV, Reeser GE, Erdman JW, Burd NA, et al.
Randomised Controlled Trial Cognitive Function
The study involved a randomized-controlled trial with 84 adults aged 25-45 years suffering from overweight or obesity. The participants were divided into a treatment group and a control group. Those in the treatment group consumed a daily meal with fresh Hass avocado for 12 weeks while the control group was given an isocaloric meal. The xanthophyll status was evaluated by measuring serum lutein and macular pigment optical density, and cognitive functions such as attention and inhibition were evaluated using the Flanker, Oddball, and Nogo tasks.
Regarding the results, the treatment group showed improved serum lutein concentrations and better performance in the Flanker task demonstrating improved attentional inhibition. However, they found no correlation between improvements in performance and changes in lutein status and no significant changes in macular pigment optical density. Therefore, it suggests that the cognitive benefits from avocado intake were not due to changes in lutein status but may involve other unknown mechanisms.
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