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Introduction
Conversations about brain health have been dominated by a competing mix of fatalism and over-promising, with aging framed as inevitable decline and “brain optimisation” sold through weak evidence.
So how should we think about cognition across the lifespan?
In this episode, we explore the idea that neuroplasticity does not disappear in adulthood, but instead continues to respond, for better or worse, to repeated behaviours and exposures. Much of what is labelled age-related cognitive decline may in fact reflect an accumulation of modifiable risk factors.
We also dig into how to critically evaluate brain-health claims and how lifestyle pillars such as exercise, sleep, diet, stress reduction and cognitive training fit into a coherent framework.
The discussion extends to emerging multimodal intervention programs, their promising signals and their clear limitations, and to a broader, multifactorial view of Alzheimer’s disease that moves beyond a narrow amyloid-centric model. Finally, we examine the role of genetics, including ApoE4, and why genetic risk does not equate to biological destiny, even later in life.
Related resources
- Join the Sigma newsletter for free
- Subscribe to Sigma Nutrition Premium
- Enroll in the next cohort of our Applied Nutrition Literacy course
- Dr. Fotuhi’s book: The Invincible Brain
- Mentioned papers:
- Fotuhi et al., 2023 – Benefits of a 12-Week Non-Drug “Brain Fitness Program” for Patients with Attention-Deficit/Hyperactive Disorder, Post-Concussion Syndrome, or Memory Loss
- Fotuhi et al., 2020 – Retrospective Analysis of a Comprehensive Concussion Recovery Program
- Fotuhi et al., 2016 – A Personalized 12-week “Brain Fitness Program” for Improving Cognitive Function and Increasing the Volume of Hippocampus in Elderly with Mild Cognitive Impairment
- Fotuhi et al., 2012 – Modifiable factors that alter the size of the hippocampus with ageing
- Related episodes:
- [03:41]Understanding neuroplasticity
- [05:22]Risk factors for cognitive decline
- [07:07]Evidence-based interventions for brain health
- [09:37]The five pillars of brain health
- [10:42]Dr. Fotuhi’s multimodal program
- [19:09]Measuring cognitive function
- [24:43]The role of amyloid and tau in Alzheimer’s
- [27:53]Genetics and lifestyle in brain health
- [30:03]Debunking myths and overhyped claims
- [36:08]Key ideas segment (premium subscribers only)
Guest Information
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He earned his medical degree from Harvard Medical School and completed a Ph.D. in neuroscience at Johns Hopkins University. That was followed by internship and neurology residency at Johns Hopkins Hospital.
In addition to his role at Johns Hopkins, he is an adjunct professor in the Department of Psychology and Brain Sciences at George Washington University, and he also lectures on neuroscience, cognition, brain health and concussion to medical students at Harvard Medical School.
In clinical practice he has combined his research on neuroplasticity and cognitive aging with patient care, developing multidisciplinary brain health programs and directing neurology services focused on memory loss, concussion and related conditions, while maintaining an active role in research publication and academic teaching.
Danny Lennon has a master’s degree (MSc.) in Nutritional Sciences from University College Cork, and he is the founder of Sigma Nutrition.
Danny is currently a member of the Advisory Board of the Sports Nutrition Association, the global regulatory body responsible for the standardisation of best practice in the sports nutrition profession.
Introduction to this Episode
Conversations about brain health have been dominated by a competing mix of fatalism and over-promising, with aging framed as inevitable decline and “brain optimisation” sold through weak evidence. So how should we think about cognition across the lifespan?
In this episode, we explore the idea that neuroplasticity does not disappear in adulthood, but instead continues to respond, for better or worse, to repeated behaviours and exposures. Much of what is labelled age-related cognitive decline may in fact reflect an accumulation of modifiable risk factors.
We also dig into how to critically evaluate brain-health claims and how lifestyle pillars such as exercise, sleep, diet, stress reduction and cognitive training fit into a coherent framework.
The discussion extends to emerging multimodal intervention programs, their promising signals and their clear limitations, and to a broader, multifactorial view of Alzheimerʼs disease that moves beyond a narrow amyloid-centric model. Finally, we examine the role of genetics, including ApoE4, and why genetic risk does not equate to biological destiny, even later in life.
