Covid infections are causing IQ drops and years of brain aging, studies suggest
Emerging studies linking COVID-19 infections to small but measurable IQ declines and “brain aging” have prompted intense scrutiny of both the science and its implications. Commenters weigh observational evidence of post-COVID cognitive impairment and long COVID against concerns about causality, study design, and the limitations of IQ as a metric, while sharing numerous anecdotes of brain fog, memory loss, and fatigue. Broader themes include how to disentangle viral effects from lockdowns and stress, the role of prior infections in cognitive decline more generally, and the need for better-controlled, replicated research before drawing firm conclusions.
Study quality and causality
- Many commenters stress that the cited work is observational and mostly correlational (self-reported surveys, no clean pre/post measures, imperfect controls).
- Several argue the article headline overstates causation; they want longitudinal designs with individual pre‑ and post‑infection scores and rigorously defined uninfected controls.
- Others counter that multiple studies across countries show consistent cognitive impairment after COVID, which they see as strong circumstantial evidence even if mechanisms aren’t fully nailed down.
IQ as a measure
- Long subthread debates IQ’s validity: culture dependence, single-number reduction of multidimensional intelligence, and confounding by language, education, and attention.
- Some defend nonverbal tests (e.g., pattern matching, matrices) as useful proxies for general problem-solving and job performance; others say IQ measures only a narrow slice and is easily distorted by illness, fatigue, ADHD, or anxiety.
- There is concern about cross-country comparisons and about interpreting small point shifts (“3 IQ points”) as meaningful.
Anecdotal cognitive effects
- Numerous reports of post-COVID brain fog, memory lapses, slower thinking, and math/logic difficulty — sometimes severe enough to derail careers or daily functioning.
- Several describe partial recovery over months to years; others report little or no recovery after 2–3 years.
- Some note similar long-tail effects from other viruses (e.g., Epstein–Barr), reinforcing that post-viral cognitive issues are not unique to COVID.
Alternative explanations and confounders
- Suggested confounders include lockdown-related isolation, missed schooling, increased poverty, depression, anxiety, sleep loss, vitamin D deficiency, and general aging.
- Some argue that pandemic-era lifestyle changes alone could explain part of the observed decline, even without direct viral brain damage.
Possible mechanisms and broader infection context
- Discussed mechanisms include neuroinflammation, metabolic changes (e.g., shifts to anaerobic respiration), endothelial damage, “post-exertional malaise,” viral persistence in tissues, and broader ME/CFS-like pathways.
- Older work is cited showing multiple severe infections (not just COVID) correlate with lower cognitive scores, implying this may be a general infection effect rather than COVID-specific.
Vaccines, excess deaths, and controversy
- Heated subthread debates whether vaccines contribute to excess deaths or long-term issues; participants cite national mortality datasets and official analyses but disagree on data quality and bias.
- Some see robust evidence that vaccination lowers all-cause mortality; others distrust public-health data and raise concerns about time-windowing, “healthy vaccinee” bias, and underreported side effects.
- Overall tone: strong polarization, with calls both to avoid conspiratorial thinking and to avoid dismissing adverse experiences outright.
Coping and treatment attempts
- People mention hyperbaric oxygen therapy, SSRIs (for possible anti-inflammatory or anxiety effects), pacing to avoid post-exertional crashes, diet changes, vitamins (B12, D, omega‑3), and long-COVID support groups.
- No clear consensus “fix”; posters emphasize that post-viral syndromes are complex, heterogeneous, and still poorly understood.