Timothy Caulfield
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caulfieldtim.bsky.social
Timothy Caulfield
@caulfieldtim.bsky.social
Professor of health law and science policy, author, speaker, and commentator. #ScienceUpFirst

Linktree: https://linktr.ee/caulfieldtim
LGBTQIA+ People’s Perspectives on LGBTQIA+-Targeted Policies and Mental Health jamanetwork.com/journals/jam... via @jama.com

"...participants expressed feelings of chronic worry and hypervigilance, social isolation, and hopelessness and powerlessness..."

Alberta situation? Ugh.
January 2, 2026 at 9:59 PM
I'm a supplement cynic. I assume bunk until proven otherwise (rare).

In today's health influencer era, sale of supplements = major red flag! 🚩

Great resource...👇

Supplements: key facts, research studies, & advice journalistsresource.org/home/dietary... by @naseemmiller.bsky.social
Dietary supplements: key facts, research studies, and advice for journalists
With the continued popularity of dietary supplements, we’ve curated credible sources of information, fact-checked data and peer-reviewed research to help you report accurately on what’s known and unkn...
journalistsresource.org
January 2, 2026 at 9:34 PM
Resisting AI slop www.science.org/doi/10.1126/...

BIG concern about AI: "...its use in the production or review of research papers could degrade reliability of the scientific literature."
January 2, 2026 at 5:52 PM
Not needed. Potentially harmful. Less #sleep.

Sum: don't.

Use of pre-workout dietary #supplements is associated with lower sleep www.sciencedirect.com/science/arti...

"Pre-workout dietary supplements have high levels of caffeine."
Use of pre-workout dietary supplements is associated with lower sleep duration among adolescents and young adults
This study aimed to investigate the association between the use of pre-workout dietary supplements and average sleep duration among adolescents and yo…
www.sciencedirect.com
January 2, 2026 at 4:57 PM
Thanks much, @bigthink.com, for picking "The Certainty Illusion" as a 2025 fav! 🙏

10 of Big Think’s favorite books in 2025 open.substack.com/pub/bigthink...
January 2, 2026 at 4:40 PM
Why are young men ‘T maxxing’ testosterone? theconversation.com/why-are-youn...

"...taking testosterone when there’s no medical need has serious health risks."

"...trend plays into the insecurities of young men and developing boys..."

If not CLINICAL need, potential for real harm.
Why are young men ‘T maxxing’ testosterone? Do they need it? And what are the risks?
T maxxing offers a compelling narrative: raise your testosterone, upgrade your life. But if you don’t have clinically low testosterone, there are health risks.
theconversation.com
January 2, 2026 at 3:54 PM
This Common Vaccine May Slow the Progression of Dementia or Even Prevent It people.com/this-common-... via @people

"We’re much more confident that what we’re actually looking at here is cause and effect."

#VaccinesWork
This Common Vaccine May Slow the Progression of Dementia or Even Prevent It
The shingles vaccine may offer a protective effect against developing dementia, as well as “therapeutic potential” for those already diagnosed.
people.com
January 2, 2026 at 3:44 PM
How 2025 showcased the power & resilience of #science www.nature.com/articles/d41...

A year of chaos. But...

"Some stood up for scientific values"

Others kept the flame of "evidence-based policymaking burning."

Many fed "humanity’s insatiable thirst for knowledge"

#GoScience! #ScienceMatters! 💪
How 2025 showcased the power and resilience of science
There were huge disruptions to the global scientific enterprise this year — but immense bright spots for health, discovery, innovation and research collaboration.
www.nature.com
January 1, 2026 at 5:23 PM
PolitiFact labeled 2025 the 'Year of the Lies' www.pbs.org/newshour/sho...

@politifact.bsky.social: "The volume & severity of inaccurate claims was just overwhelming..."

Lies about vaccines. Lies about Tylenol. Lies about immigration, crime, tariffs. Lies about media bias. Lies. Lies. Lies.
Why PolitiFact has labeled 2025 the 'Year of the Lies'
For the past 15 years, the fact-checkers at PolitiFact have sorted through hundreds of statements by politicians to name the "Lie of the Year." This year, the editors dubbed 2025 the "Year of the Lies...
www.pbs.org
January 1, 2026 at 4:55 PM
South Carolina serves up another taste of RFK Jr.’s America www.washingtonpost.com/opinions/202...

"...just a taste of what’s coming" if US follows "reckless path being charted by anti-vaccine activists" like RFK Jr, et al.

Alas, scientific realities lost on those driven by ideology.
Opinion | South Carolina serves up another taste of RFK Jr.’s America
Yet another measles outbreak shows the consequences of anti-vaccine sentiments.
www.washingtonpost.com
December 31, 2025 at 11:57 PM
Exposure = Normalization

Study: Shocking headlines spark initial doubt but eventually build belief www.psypost.org/shocking-hea...

"...clickbait-style language might hurt credibility in the short term, it may be effective at planting information that people eventually accept as true."
Shocking headlines spark initial doubt but eventually build belief
New research shows that while sensational words make headlines seem less credible instantly, readers are more likely to believe the information weeks later due to a psychological phenomenon called the...
www.psypost.org
December 31, 2025 at 7:23 PM
But I'm still waiting for the National Team to call! I'm ready! 💪

Long-term study reveals physical ability peaks at age 35 news.ki.se/long-term-st...

"...but it is never too late to start exercising."

"...physical activity can slow the decline..."

#Move!
Long-term study reveals physical ability peaks at age 35
A 47-year-long Swedish study at Karolinska Institutet reveals how fitness, strength, and muscle endurance change during adulthood. The results show that physical ability starts to deteriorate as early...
news.ki.se
December 31, 2025 at 6:23 PM
So much exploitive & harmful BS... 👇

Cancer Misinformation in 2025: How Viral Narratives Are Putting Patients at Risk oncodaily.com/oncolibrary/... via @oncodaily.bsky.social

Watch for lies about:
- unproven therapies
- conspiracies to withhold unproven therapies
- unproven cancer risks
- etc.
Cancer Misinformation in 2025: How Viral Narratives Are Putting Patients at Risk - OncoDaily
Cancer Misinformation in 2025: How Viral Narratives Are Putting Patients at Risk / cancer, Cancer Misinformation in 2025, Headlines, OncoDaily, Oncology
oncodaily.com
December 31, 2025 at 6:05 PM
Reposted by Timothy Caulfield
My best gifts to myself usually involve the joy of reading. This year the theme was an extra appreciation for science & unshakable truth-telling in the face of big lies. Thanks to authors like @michaelemann.bsky.social @peterhotezmdphd.bsky.social @brittlestar.com @caulfieldtim.bsky.social etc.
December 31, 2025 at 3:06 AM
The Damage Kennedy Has Done in Less Than a Year www.nytimes.com/2025/12/30/o...

“None of these changes are evidence-based” [read: harmful BS]

And will “sow confusion, undermine public trust & ultimately drive the nation’s vaccination rates down.”

Sum: evil sh*t.

#VaccinesWork
Opinion | This Is the Damage Kennedy Has Done in Less Than a Year
www.nytimes.com
December 30, 2025 at 6:52 PM
🚨 Replacing US vaccine schedule with Denmark’s is negligence www.washingtonpost.com/opinions/202... @drdemetre.bsky.social

Denmark: small, universal health care, every parent has access to care & every gap is quickly closed

US: Millions of uninsured, poor prenatal care, fragmented systems, etc.
Opinion | The U.S. vaccine schedule is a jet engine. Denmark’s is a toy plane.
Replacing the U.S. vaccine schedule with one like Denmark’s would be negligence.
www.washingtonpost.com
December 30, 2025 at 12:02 AM
Reposted by Timothy Caulfield
“Marina Vance had an E.P.A. grant to help homeowners counter the impact of wildfire smoke, until the agency deemed the research “no longer consistent” with its priorities.”
www.nytimes.com/2025/12/27/s...
She Studied the Health Effects of Wildfires
www.nytimes.com
December 28, 2025 at 3:37 PM
Stem cells [BS] in your YouTube feed: www.cell.com/stem-cell-re...

Influencer with most the most impact: Joe Rogan.

He "positioned himself as an explicit online mediator of information about stem cell procedures."

"Notably he did so without any acknowledgment of their unproven status."
Stem cells in your YouTube feed: The complex landscape and unexpected mediators of online information
In this article, Grundtvig and Munsie provide a large-scale analysis, identifying 4,481 stem cell-related videos on YouTube across 1,734 channels and attracting 134 million views. The article explores...
www.cell.com
December 29, 2025 at 6:07 PM
Political identity drives embrace of BS.

Linking personal identity to political issues predicts a preference for extreme candidates www.psypost.org/linking-pers... via @psypost.bsky.social

From study: "...as attitudes become more identity relevant, they become more extreme..."
Linking personal identity to political issues predicts a preference for extreme candidates
Evidence from the Journal of Experimental Social Psychology suggests that connecting identity to political stances promotes extremity. This suggests that voters choose radical candidates because extre...
www.psypost.org
December 29, 2025 at 5:58 PM
#Cancer #misinformation everywhere...

"...exposure to such misinformation was reported by a vast majority of participants."

"...underscoring the need for better survivorship communication"

Fear & Medical Misinformation Among Patients with Breast Cancer jamanetwork.com/journals/jam...
Misinformation Regarding Progression or Recurrence in Patients With Breast Cancer
This survey study of US adults with a history of breast cancer reports the prevalence of misinformation and its association with recurrence fears and treatment adherence.
jamanetwork.com
December 29, 2025 at 5:19 PM
Good stuff... 👇

5 lessons about misinformation from ancient Greek and Roman scientist theconversation.com/5-lessons-ab...

1. Start with observations
2. Think critically
3. Acknowledge what you don’t know
4. Science is part of culture
5. Science is for everyone
5 lessons about misinformation from ancient Greek and Roman scientists
Ancient thinkers struggled to tell facts from falsehoods just like we do – and their strategies are still relevant today.
theconversation.com
December 29, 2025 at 4:56 PM
Regulating DTC #microbiome tests academic.oup.com/jlb/article/...

"...often misleading to consumers..."

"...the tests lack analytical and clinical validity."

"...may have many 'false positive' or 'false negatives' and can harm consumers."

Needed: more stringent regulation!
Is the current regulatory framework for direct-to-consumer microbiome-based tests sufficient to protect consumers from medical, economic, and dignitary harms?
Abstract. This article offers a thorough analysis of an important public health issue–the lack of regulation of companies selling direct-to-consumer (DTC)
academic.oup.com
December 28, 2025 at 3:56 PM
More than 20% of videos shown to new YouTube users are ‘AI slop’, study finds www.theguardian.com/technology/2...

Generates "...63bn views & 221 million subscribers..."

From study: "...new research shows that 21-33% of YouTube’s feed may consist of AI slop or brainrot videos."
More than 20% of videos shown to new YouTube users are ‘AI slop’, study finds
Low-quality AI-generated content is now saturating social media – and generating about $117m a year, data shows
www.theguardian.com
December 28, 2025 at 3:50 PM
The Role of Doctors Is Changing Forever www.newyorker.com/culture/2025... by @dhruvkhullar.bsky.social

"...a thriving profession will set norms, correct itself, and defend against unrestrained commercialization and exploitation."
The Role of Doctors Is Changing Forever
Some patients don’t trust us. Others say they don’t need us. It’s time for us to think of ourselves not as the high priests of health care but as what we have always been: healers.
www.newyorker.com
December 27, 2025 at 4:32 PM
What motivates conspiracy belief? www.tandfonline.com/doi/full/10....

Dimensions, include:
- Truth-seeking
- Group cohesion (eg, weaponizing narratives to scapegoat minority groups)
- Cognitive needs (eg, illusory pattern perception)
- Content-anomie
Dimensions of conspiracy theories: toward a unifying framework
Philosophical debate on conspiracy theories divides between particularism, which argues for an evaluation of conspiracy theories on a case by case, and generalism, which treats them — as a class — ...
www.tandfonline.com
December 27, 2025 at 4:27 PM