Fish Oil Doesn’t Work? Anti-Aging Butterflies, the Ancient Brain Focus Switch, and the Best Brain Diet : 1491 cover art

Fish Oil Doesn’t Work? Anti-Aging Butterflies, the Ancient Brain Focus Switch, and the Best Brain Diet : 1491

Fish Oil Doesn’t Work? Anti-Aging Butterflies, the Ancient Brain Focus Switch, and the Best Brain Diet : 1491

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Fish Oil Supplements And Alzheimer’s-Related Decline A two-year randomized, double-blind, placebo-controlled trial led by researchers at USC tested whether 2,000 mg of DHA fish oil daily could slow Alzheimer’s-related brain changes in 365 adults ages 55–80 who rarely consumed fish and had at least one Alzheimer’s risk factor. Researchers confirmed the supplement reached the brain by measuring a roughly 17% increase in cerebrospinal fluid DHA after six months. Despite successfully increasing brain DHA levels, participants taking fish oil showed no significant improvements in memory, global cognitive function, or hippocampal volume compared to placebo after two years. Host Dave Asprey explains why raising a single biomarker doesn’t always translate into better brain performance, why nutrition works differently inside a complete dietary pattern than as an isolated supplement, and what this study means for anyone relying on fish oil as an Alzheimer’s prevention strategy. Sources: https://medicalxpress.com/news/2026-06-fish-oil-supplements-alzheimer-decline.pdf https://www.cnn.com/2026/06/18/health/omega-3-fish-oil-algae-supplement-wellness ~~ DASH Diet Showed the Strongest Link to Long-Term Brain Health Researchers from Harvard analyzed dietary data from 159,347 participants across three long-running U.S. health studies to examine how eating patterns influence cognitive aging. Participants completed dietary questionnaires every four years over several decades, allowing investigators to compare six healthy dietary patterns, including the DASH and Mediterranean diets. While all six were associated with better cognitive health later in life, adherence to the DASH diet produced the strongest association, with participants showing roughly a 40% lower risk of subjective cognitive decline and stronger performance on objective cognitive testing. The protective relationship was strongest when healthy eating habits began during midlife. Host Dave Asprey breaks down why blood sugar control, lower inflammation, and healthier blood vessels may be the real drivers behind long-term brain resilience, and why your dietary choices in your 40s and 50s may have an outsized impact on cognitive aging decades later. Sources: https://jamanetwork.com/journals/jamaneurology/article-abstract/2845466 https://www.health.harvard.edu/diet-and-nutrition/harvard-study-six-healthy-diets-linked-with-better-long-term-brain-health https://www.eurekalert.org/news-releases/1117225 ~~ Scientists Identified an Ancient Brain Circuit That Filters Distractions Johns Hopkins researchers discovered a small population of inhibitory neurons within an evolutionarily ancient brainstem region that appears to control selective attention by determining which sensory information deserves focus and which distractions should be ignored. Mice trained on visual attention tasks consistently ignored irrelevant stimuli until researchers temporarily silenced these neurons, causing even weak distractions to hijack their attention while leaving vision and movement otherwise unaffected. Similar brain circuits exist in birds, reptiles, and other vertebrates, suggesting this attentional filtering system evolved long before the modern human cortex. Host Dave Asprey explains why attention may depend on much older brain circuitry than previously believed, how this discovery could reshape our understanding of ADHD and autism, and why future therapies may target the brainstem instead of the prefrontal cortex. Sources: https://www.sciencedaily.com/releases/2026/06/260624025426.htm ~~ Nearly Half of Older Adults Improved With Age Instead of Declining A Yale-led study followed 11,340 adults age 65 and older for up to 12 years using repeated measurements of cognition and walking speed to better understand how aging changes over time. Rather than finding universal decline, researchers discovered that 45% of participants improved in either cognitive function, physical performance, or both. Nearly one-third experienced measurable cognitive improvements, while over one-quarter improved physically. Researchers also found that participants with more positive beliefs about aging were significantly more likely to improve, even after accounting for education, chronic illness, depression, and other health factors. Host Dave Asprey explores why expectations about aging may become biologically embedded, why decline is far less inevitable than conventional medicine often assumes, and how mindset may directly influence healthy longevity. Sources: https://www.sciencedaily.com/releases/2026/06/260620100428.htm ~~ Glyphosate May Be Contributing to Antibiotic-Resistant Superbugs Researchers publishing in Frontiers in Microbiology examined 102 bacterial strains collected from hospitals, agricultural land, and protected wetlands to investigate whether glyphosate exposure contributes to multidrug antibiotic resistance. Hospital bacteria demonstrated ...
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