{
 "name": "cognitive decline",
 "type": "concept",
 "episodes": [
  "huberman-lab-2026-07-20-accelerate-learning-increase-cognitive-capacity-dr-tommy-woo"
 ],
 "claims": [
  {
   "holder": "Tommy Wood",
   "claim": "Older adults who continue cognitively engaging hobbies (lectures, volunteering, crosswords) show slowed cognitive decline or lower dementia rates, though this observational finding is confounded by reverse causation.",
   "stance": "fact_cited",
   "conviction": 0.6,
   "subjects": [
    "cognitive decline",
    "learning"
   ],
   "timestamp": "12:12",
   "quote": "Those individuals tend to either have slowed rates of decline or better maintenance of function over time and or lower rates of dementia.",
   "episode_id": "huberman-lab-2026-07-20-accelerate-learning-increase-cognitive-capacity-dr-tommy-woo",
   "published_at": "2026-07-20"
  },
  {
   "holder": "Tommy Wood",
   "claim": "Processing-speed brain training with periodic booster sessions significantly reduced dementia risk 20 years later, per a secondary analysis of the ACTIVE trial.",
   "stance": "fact_cited",
   "conviction": 0.75,
   "subjects": [
    "cognitive decline",
    "learning"
   ],
   "timestamp": "18:05",
   "quote": "had a significantly decreased risk of dementia 20 years later.",
   "episode_id": "huberman-lab-2026-07-20-accelerate-learning-increase-cognitive-capacity-dr-tommy-woo",
   "published_at": "2026-07-20"
  },
  {
   "holder": "Tommy Wood",
   "claim": "Ballroom and line dancing have the strongest evidence among interventions for improving cognitive function in older adults.",
   "stance": "fact_cited",
   "conviction": 0.8,
   "subjects": [
    "exercise",
    "cognitive decline"
   ],
   "timestamp": "27:58",
   "quote": "ballroom and line dancing have the greatest effect on cognitive function.",
   "episode_id": "huberman-lab-2026-07-20-accelerate-learning-increase-cognitive-capacity-dr-tommy-woo",
   "published_at": "2026-07-20"
  },
  {
   "holder": "Tommy Wood",
   "claim": "Cognitive-prevention trials converge on whole-food, nutrient-dense eating patterns rather than avoiding or emphasizing any single food or nutrient.",
   "stance": "fact_cited",
   "conviction": 0.7,
   "subjects": [
    "Mediterranean diet",
    "cognitive decline"
   ],
   "timestamp": "1:01:28",
   "quote": "it's much more about whole foods, they're nutrient dense, rather than avoiding any",
   "episode_id": "huberman-lab-2026-07-20-accelerate-learning-increase-cognitive-capacity-dr-tommy-woo",
   "published_at": "2026-07-20"
  },
  {
   "holder": "Tommy Wood",
   "claim": "Brain volume follows a bell-shaped curve with energy availability — both chronic caloric restriction and chronic caloric excess are associated with smaller brain volume.",
   "stance": "fact_cited",
   "conviction": 0.75,
   "subjects": [
    "cognitive decline"
   ],
   "timestamp": "1:01:28",
   "quote": "what they found is this kind of this bell-shaped curve between energy availability and brain volume.",
   "episode_id": "huberman-lab-2026-07-20-accelerate-learning-increase-cognitive-capacity-dr-tommy-woo",
   "published_at": "2026-07-20"
  },
  {
   "holder": "Tommy Wood",
   "claim": "A basic, low-dose multivitamin modestly improved cognitive function in the COSMOS trial, suggesting simply 'covering the bases' nutritionally is a reasonable general-population strategy.",
   "stance": "fact_cited",
   "conviction": 0.65,
   "subjects": [
    "cognitive decline"
   ],
   "timestamp": "1:15:52",
   "quote": "those who got the multivitamin saw changes in cognitive function that suggested some improvements.",
   "episode_id": "huberman-lab-2026-07-20-accelerate-learning-increase-cognitive-capacity-dr-tommy-woo",
   "published_at": "2026-07-20"
  },
  {
   "holder": "Tommy Wood",
   "claim": "A 20-30 minute jog below one's usual training intensity is the best-evidenced protocol for immediately boosting cognitive function afterward, whereas truly exhaustive exercise impairs subsequent cognitive work.",
   "stance": "fact_cited",
   "conviction": 0.75,
   "subjects": [
    "exercise",
    "cognitive decline"
   ],
   "timestamp": "1:40:39",
   "quote": "the protocol that has the best evidence for it is a 20 to 30 minute jog.",
   "episode_id": "huberman-lab-2026-07-20-accelerate-learning-increase-cognitive-capacity-dr-tommy-woo",
   "published_at": "2026-07-20"
  },
  {
   "holder": "Tommy Wood",
   "claim": "Changes in white-matter structure with age are among the best predictors of cognitive decline, arguably more so than amyloid or tau pathology.",
   "stance": "fact_cited",
   "conviction": 0.7,
   "subjects": [
    "white matter",
    "cognitive decline"
   ],
   "timestamp": "1:56:38",
   "quote": "changes in white matter structure with age are one of the best predictors of cognitive decline with age.",
   "episode_id": "huberman-lab-2026-07-20-accelerate-learning-increase-cognitive-capacity-dr-tommy-woo",
   "published_at": "2026-07-20"
  },
  {
   "holder": "Andrew Huberman",
   "claim": "Roughly 45% of dementia risk is attributable to 14 modifiable factors identified by the Lancet Commission (blood pressure, hearing/vision loss, education, LDL, physical activity, etc.).",
   "stance": "fact_cited",
   "conviction": 0.7,
   "subjects": [
    "Lancet Commission on Dementia Prevention",
    "cognitive decline"
   ],
   "timestamp": "2:03:14",
   "quote": "there were 14 risk factors who between them accounted for about 45% of dementia risk or dementia cases, and they are modifiable.",
   "episode_id": "huberman-lab-2026-07-20-accelerate-learning-increase-cognitive-capacity-dr-tommy-woo",
   "published_at": "2026-07-20"
  },
  {
   "holder": "Tommy Wood",
   "claim": "Chronic sleep deprivation likely raises dementia risk, and its omission from the Lancet Commission's official risk-factor list, while defensible given weaker evidence quality, is a shame given how foundational sleep seems.",
   "stance": "opinion",
   "conviction": 0.65,
   "subjects": [
    "cognitive decline"
   ],
   "timestamp": "2:07:28",
   "quote": "it seems so foundational to me that it does seem kind of a shame.",
   "episode_id": "huberman-lab-2026-07-20-accelerate-learning-increase-cognitive-capacity-dr-tommy-woo",
   "published_at": "2026-07-20"
  },
  {
   "holder": "Andrew Huberman",
   "claim": "Cognitive function does not decline smoothly with age but drops in step changes following major illness, especially hospitalization.",
   "stance": "fact_cited",
   "conviction": 0.75,
   "subjects": [
    "cognitive decline",
    "Adult Changes in Thought Study"
   ],
   "timestamp": "2:15:50",
   "quote": "the biggest decreases happen stepwise after periods of significant illness.",
   "episode_id": "huberman-lab-2026-07-20-accelerate-learning-increase-cognitive-capacity-dr-tommy-woo",
   "published_at": "2026-07-20"
  },
  {
   "holder": "Andrew Huberman",
   "claim": "Minimizing time spent seriously ill (e.g., via vaccination) may itself improve long-term cognitive trajectory, because illness removes people from the stimulating inputs that maintain brain function.",
   "stance": "opinion",
   "conviction": 0.65,
   "subjects": [
    "cognitive decline"
   ],
   "timestamp": "2:15:50",
   "quote": "that could lead to greater benefits, change the overall trajectory.",
   "episode_id": "huberman-lab-2026-07-20-accelerate-learning-increase-cognitive-capacity-dr-tommy-woo",
   "published_at": "2026-07-20"
  }
 ],
 "predictions": [],
 "facts": [
  {
   "statement": "In a large observational study of about 1.2 million people, reaction time declined gradually from one's 30s onward, while processing speed stayed relatively stable until about 60 before dropping off.",
   "subjects": [
    "learning",
    "cognitive decline"
   ],
   "value": "~1.2M participants",
   "timestamp": "20:26",
   "quote": "it was about 1.2 million people, slowly decreases in sort of like from about our 30s",
   "source": "Tommy Wood",
   "episode_id": "huberman-lab-2026-07-20-accelerate-learning-increase-cognitive-capacity-dr-tommy-woo",
   "published_at": "2026-07-20"
  },
  {
   "statement": "Vitamin D, iron, omega-3 fatty acids, and methylation-related B vitamins (B12, folate, and potentially B6/riboflavin) have the best evidence among nutrients for cognitive function and dementia risk.",
   "subjects": [
    "omega-3 fatty acids",
    "cognitive decline"
   ],
   "timestamp": "1:01:28",
   "quote": "The ones that we have the best evidence for are vitamin D, iron, omega-3 fatty acids, the B vitamins involved, and the B vitamins involved in methylation.",
   "source": "Tommy Wood",
   "episode_id": "huberman-lab-2026-07-20-accelerate-learning-increase-cognitive-capacity-dr-tommy-woo",
   "published_at": "2026-07-20"
  },
  {
   "statement": "In the COSMOS trial, a cocoa flavonol supplement was only beneficial for cognitive function in participants who started with a poor-quality diet.",
   "subjects": [
    "cognitive decline"
   ],
   "timestamp": "1:15:52",
   "quote": "supplementing with this antioxidant cocoa flavonol was only beneficial in those who tended to have a poor quality diet to start with",
   "source": "Tommy Wood",
   "episode_id": "huberman-lab-2026-07-20-accelerate-learning-increase-cognitive-capacity-dr-tommy-woo",
   "published_at": "2026-07-20"
  },
  {
   "statement": "Elevated dementia risk from homocysteine appears to begin around 10-13, well below the standard lab reference range that only flags levels above 15-16.",
   "subjects": [
    "omega-3 fatty acids",
    "cognitive decline"
   ],
   "value": "risk above ~10-13 vs. lab-normal up to 15-16",
   "timestamp": "1:11:03",
   "quote": "we know that risk is definitely elevated above 13, and is probably elevated above sort of 10 to 11",
   "source": "Tommy Wood",
   "episode_id": "huberman-lab-2026-07-20-accelerate-learning-increase-cognitive-capacity-dr-tommy-woo",
   "published_at": "2026-07-20"
  },
  {
   "statement": "Dementia risk from sleep loss appears to rise once someone consistently sleeps fewer than about six hours a night.",
   "subjects": [
    "cognitive decline"
   ],
   "value": "<6 hrs/night threshold",
   "timestamp": "2:08:07",
   "quote": "the cutoff is really around six hours. So if you're consistently sleeping fewer than six hours, that's where risk starts to increase.",
   "source": "Andrew Huberman",
   "episode_id": "huberman-lab-2026-07-20-accelerate-learning-increase-cognitive-capacity-dr-tommy-woo",
   "published_at": "2026-07-20"
  },
  {
   "statement": "A prior paper co-authored by Wood argues that a key driver of age-related cognitive decline is that adults stop giving their brains novel, complex inputs.",
   "subjects": [
    "neuroplasticity",
    "cognitive decline"
   ],
   "timestamp": "30:25",
   "quote": "potentially one of the reasons why we lose cognitive function as we get older is because we stop giving our brain novel inputs or complex inputs that help maintain function, drive neuroplasticity.",
   "source": "Tommy Wood",
   "episode_id": "huberman-lab-2026-07-20-accelerate-learning-increase-cognitive-capacity-dr-tommy-woo",
   "published_at": "2026-07-20"
  }
 ],
 "first_seen": "2026-07-20",
 "last_seen": "2026-07-20"
}