The Structure and Dynamics of the Online MAHA-sphere
Pith reviewed 2026-05-21 06:16 UTC · model grok-4.3
The pith
MAHA-aligned users bundle health and anti-science themes into coherent networks, while anti-MAHA users show no bundling beyond chance.
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
Core claim
MAHA-aligned users exhibit strong cross-theme bundling and coherent network structure, whereas anti-MAHA users do not bundle beyond chance. During the pandemic, anti-fluoride and anti-mask posters transitioned into anti-vaccination posts, and later moved to broader anti-science narratives, suggesting that vaccine skepticism may serve as an entry point into wider anti-science engagement. Pro- and anti-MAHA communities also exhibit distinct psycholinguistic profiles, reflecting deeper ideological and rhetorical divides.
What carries the argument
A tree-based few-shot LLM pipeline that classifies user stances (pro, anti, neutral) across twelve MAHA-adjacent themes, followed by user-level opinion scores that reveal cross-theme interactions and temporal shifts.
If this is right
- MAHA users cluster in a few mainstream subreddits yet post across a wide ecosystem of related communities.
- Vaccine skepticism can function as an entry point that leads users toward wider anti-science narratives.
- Pro- and anti-MAHA groups maintain distinct psycholinguistic profiles that mark deeper rhetorical divides.
- Opinion shifts unfold over time, with specific health concerns evolving into broader skepticism during the pandemic.
Where Pith is reading between the lines
- Public health efforts might target early skepticism points such as fluoride or mask concerns to interrupt later transitions into vaccine and science distrust.
- The coherent network structure among MAHA users could make those communities more resistant to outside messaging than the less bundled anti-MAHA side.
- Similar cross-theme bundling patterns may appear in other online ideological movements and could be tested with the same stance-classification approach.
Load-bearing premise
The tree-based few-shot LLM pipeline accurately classifies user stances across the twelve themes without substantial bias or misclassification that would distort the bundling and transition findings.
What would settle it
Re-annotating a random sample of posts with multiple human coders and finding low agreement with the LLM stance labels, particularly on the identified transitions from anti-fluoride or anti-mask to anti-vaccine content.
Figures
read the original abstract
The "Make America Healthy Again" (MAHA) movement has created a complex ideological ecosystem within online communities, where advocacy for healthier lifestyles and whole-food diets coexists with vaccine skepticism and anti-science attitudes. Understanding how these interconnected beliefs interact, overlap, and evolve is critical for public health communication and intervention. We uncover the functional overlaps, network structures, engagement patterns, opinion dynamics, and linguistic differences across the full spectrum of MAHA ideologies. Using large-scale Reddit data spanning six years, we identified 12 MAHA-adjacent themes, including mainstream topics such as exercise, whole food, and screen use, as well as contentious topics such as vaccines, masks, GMOs, fluoride, and others. We developed a tree-based few-shot LLM pipeline to classify stances (pro, anti, neutral) across all themes, then computed user-level opinion scores to examine cross-theme interactions and opinion shifts over time. We find that MAHA-aligned users exhibit strong cross-theme bundling and coherent network structure, whereas anti-MAHA users do not bundle beyond chance. MAHA users cluster in a few mainstream subreddits, but post in a wide ecosystem of MAHA-related communities. During the pandemic, anti-fluoride and anti-mask posters transitioned into anti-vaccination posts, and later moved to broader anti-science narratives, suggesting that vaccine skepticism may serve as an entry point into wider anti-science engagement. Pro- and anti-MAHA communities also exhibit distinct psycholinguistic profiles, reflecting deeper ideological and rhetorical divides.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. This manuscript analyzes the structure and dynamics of the online 'Make America Healthy Again' (MAHA) movement using six years of Reddit data. The authors identify 12 themes, employ a tree-based few-shot LLM pipeline to assign stance labels (pro, anti, neutral) to posts, compute user-level opinion scores, and investigate cross-theme bundling, network coherence, engagement patterns, and temporal transitions. They report that MAHA-aligned users show strong bundling and structured networks unlike anti-MAHA users, MAHA users cluster in mainstream subreddits but engage broadly, and there are specific transitions during the pandemic from anti-fluoride and anti-mask to anti-vaccination and then anti-science narratives, alongside distinct linguistic profiles.
Significance. If the stance classifications prove reliable, the work would advance understanding of ideological bundling and gateway effects in online health and science-skeptic communities, with potential value for public health monitoring and communication strategies. The multi-theme, longitudinal Reddit analysis offers a broad empirical map of how mainstream wellness topics intersect with contentious ones.
major comments (1)
- [Methods] Methods (as described): The tree-based few-shot LLM pipeline for classifying post stances across the 12 themes reports no validation details, human-annotated test set, accuracy/precision/recall metrics, or error analysis. All headline results on cross-theme bundling, network structure, and pandemic-era transitions (anti-fluoride/anti-mask to anti-vax to anti-science) are direct aggregates of these labels; without quantitative checks on classifier performance or bias, systematic mislabeling could artifactually produce the reported MAHA vs. anti-MAHA differences.
minor comments (2)
- [Abstract] Abstract: The data collection period is described only as 'six years' without exact dates, total post or user counts, or subreddit sampling criteria, which would help readers assess scale and potential biases.
- [Methods] The description of user-level opinion scores and bundling metrics would benefit from explicit formulas or pseudocode showing how per-post labels are aggregated and compared to a null model of chance co-occurrence.
Simulated Author's Rebuttal
We thank the referee for their constructive comments on our manuscript examining the structure and dynamics of the online MAHA movement. The primary methodological concern raised is the lack of reported validation for the stance classification pipeline. We address this point directly below and commit to revisions that enhance transparency without altering the core findings or interpretations.
read point-by-point responses
-
Referee: [Methods] Methods (as described): The tree-based few-shot LLM pipeline for classifying post stances across the 12 themes reports no validation details, human-annotated test set, accuracy/precision/recall metrics, or error analysis. All headline results on cross-theme bundling, network structure, and pandemic-era transitions (anti-fluoride/anti-mask to anti-vax to anti-science) are direct aggregates of these labels; without quantitative checks on classifier performance or bias, systematic mislabeling could artifactually produce the reported MAHA vs. anti-MAHA differences.
Authors: We agree that the current manuscript does not include explicit quantitative validation details, a human-annotated test set, performance metrics, or error analysis for the tree-based few-shot LLM pipeline. This is a fair and substantive observation, as such information is necessary to evaluate the reliability of the stance labels underlying the reported patterns of cross-theme bundling, network coherence, and temporal transitions. In the revised version we will add a dedicated Methods subsection that describes the validation process in full. This will include: (1) construction of a human-annotated gold-standard test set sampled across all 12 themes and stance categories; (2) annotation protocol and inter-annotator agreement statistics; (3) classifier performance metrics (accuracy, precision, recall, and F1 scores) broken down by theme and stance; and (4) a qualitative error analysis identifying common failure modes together with steps taken during prompt design and few-shot example selection to reduce systematic bias. While the large data volume and the fact that anti-MAHA users show no bundling beyond chance provide indirect support that any mislabeling is not uniformly directional, we recognize that these arguments are insufficient without the requested quantitative checks. We will therefore incorporate the validation results and make the annotated test set available to readers. revision: yes
Circularity Check
No circularity: empirical pipeline on external data yields independent aggregates
full rationale
The paper collects six years of Reddit posts, applies a tree-based few-shot LLM classifier to assign per-post stance labels (pro/anti/neutral) across 12 themes, then aggregates those labels into user-level opinion scores for bundling, network, and transition analyses. No equations, fitted parameters, or self-citations are invoked that reduce the reported cross-theme bundling, coherent networks, or pandemic-era transitions back to the classifier outputs by construction; the findings remain direct statistical summaries of the labeled external corpus rather than tautological restatements of inputs.
Axiom & Free-Parameter Ledger
Lean theorems connected to this paper
-
IndisputableMonolith/Cost/FunctionalEquationwashburn_uniqueness_aczel unclear?
unclearRelation between the paper passage and the cited Recognition theorem.
We developed a tree-based few-shot LLM pipeline to classify stances (pro, anti, neutral) across all themes, then computed user-level opinion scores to examine cross-theme interactions and opinion shifts over time.
-
IndisputableMonolith/Foundation/RealityFromDistinctionreality_from_one_distinction unclear?
unclearRelation between the paper passage and the cited Recognition theorem.
MAHA-aligned users exhibit strong cross-theme bundling and coherent network structure, whereas anti-MAHA users do not bundle beyond chance.
What do these tags mean?
- matches
- The paper's claim is directly supported by a theorem in the formal canon.
- supports
- The theorem supports part of the paper's argument, but the paper may add assumptions or extra steps.
- extends
- The paper goes beyond the formal theorem; the theorem is a base layer rather than the whole result.
- uses
- The paper appears to rely on the theorem as machinery.
- contradicts
- The paper's claim conflicts with a theorem or certificate in the canon.
- unclear
- Pith found a possible connection, but the passage is too broad, indirect, or ambiguous to say the theorem truly supports the claim.
Reference graph
Works this paper leans on
-
[1]
Zur Elektrodynamik bewegter K \"o rper
Albert Einstein. Zur Elektrodynamik bewegter K \"o rper . ( German ) [ On the electrodynamics of moving bodies]. Annalen der Physik. 1905. doi:http://dx.doi.org/10.1002/andp.19053221004
-
[2]
Michel Goossens and Frank Mittelbach and Alexander Samarin. The \ Companion. 1993
work page 1993
- [3]
-
[5]
Razi, Afsaneh and Alsoubai, Ashwaq and Kim, Seunghyun and Naher, Nurun and Ali, Shiza and Stringhini, Gianluca and De Choudhury, Munmun and Wisniewski, Pamela J. , title =. Extended Abstracts of the 2022 CHI Conference on Human Factors in Computing Systems , articleno =. 2022 , isbn =. doi:10.1145/3491101.3503569 , abstract =
-
[6]
The. Proc. ACM Hum.-Comput. Interact. , author =. 2025 , pages =. doi:10.1145/3757429 , abstract =
-
[7]
Intervening on Social Comparisons on Social Media: Electronic Daily Diary Pilot Study
Andrade, Fernanda C and Erwin, Savannah and Burnell, Kaitlyn and Jackson, Jalisa and Storch, Marley and Nicholas, Julia and Zucker, Nancy. Intervening on Social Comparisons on Social Media: Electronic Daily Diary Pilot Study. JMIR Ment Health. 2023. doi:10.2196/42024
-
[8]
Introduction to National Internet Observatory , author=
-
[9]
Researcher access to social media data: Lessons from clinical trial data sharing , author=. Berkeley Tech. LJ , volume=. 2024 , publisher=
work page 2024
-
[10]
The SAGE Handbook of Social Media Research Methods , pages=
Studying anti-social behaviour on Reddit with Communalytic , author=. The SAGE Handbook of Social Media Research Methods , pages=
-
[11]
Building OPUS, an Open Platform for social media User Studies , author=
-
[12]
Make Our Children Healthy Again: Assessment , author =. 2025 , month = may, url =
work page 2025
- [13]
- [14]
- [15]
- [16]
-
[17]
Roeder, Amy , title =. Harvard T.H. Chan School of Public Health News , year =
-
[21]
Modeling Echo Chambers and Polarization Dynamics in Social Networks , author =. Phys. Rev. Lett. , volume =. 2020 , month =. doi:10.1103/PhysRevLett.124.048301 , url =
-
[22]
Parallelizing LQR computation through endpoint-explicit riccati recursion,
Byron Reeves and Nilam Ram and Thomas N. Robinson and James J. Cummings and C. Lee Giles and Jennifer Pan and Agnese Chiatti and Mj Cho and Katie Roehrick and Xiao Yang and Anupriya Gagneja and Miriam Brinberg and Daniel Muise and Yingdan Lu and Mufan Luo and Andrew Fitzgerald and Leo Yeykelis , title =. Human–Computer Interaction , volume =. 2021 , publi...
-
[23]
The World Wide Web Conference , pages =
Zaman, Anis and Acharyya, Rupam and Kautz, Henry and Silenzio, Vincent , title =. The World Wide Web Conference , pages =. 2019 , isbn =. doi:10.1145/3308558.3313557 , abstract =
-
[24]
arXiv: Human-Computer Interaction , year=
Individual-level Anxiety Detection and Prediction from Longitudinal YouTube and Google Search Engagement Logs , author=. arXiv: Human-Computer Interaction , year=
-
[25]
Zaman, Anis and Silenzio, Vincent and Kautz, Henry , title =. Proceedings of the 14th EAI International Conference on Pervasive Computing Technologies for Healthcare , pages =. 2021 , isbn =. doi:10.1145/3421937.3421959 , abstract =
-
[26]
Pennebaker, James and Francis, Martha and Booth, Roger , year =
- [27]
-
[28]
Kansas Health Institute , publisher =
Make America Healthy Again , author =. Kansas Health Institute , publisher =. 2025 , month =
work page 2025
-
[29]
Social Media and Adolescent Health , isbn =. 2024 , publisher =. doi:10.17226/27396 , abstract =
- [30]
-
[31]
Cognitive processing , volume=
Parents’ beliefs in misinformation about vaccines are strengthened by pro-vaccine campaigns , author=. Cognitive processing , volume=. 2019 , publisher=
work page 2019
-
[32]
Journal of Medical Internet Research , author =
Online. Journal of Medical Internet Research , author =. 2022 , note =. doi:10.2196/42447 , abstract =
-
[34]
Understanding vaccine hesitancy around vaccines and vaccination from a global perspective:. Vaccine , author =. 2014 , keywords =. doi:10.1016/j.vaccine.2014.01.081 , abstract =
-
[35]
Griesemer, Sam and Schlessinger, Louis , file =. Detection and. 2018 , note =
work page 2018
-
[36]
Identifying social roles in reddit using network structure , isbn =
Buntain, Cody and Golbeck, Jennifer , month = apr, year =. Identifying social roles in reddit using network structure , isbn =. Proceedings of the 23rd. doi:10.1145/2567948.2579231 , abstract =
-
[37]
Grover, Aditya and Leskovec, Jure , month = aug, year =. node2vec:. Proceedings of the 22nd. doi:10.1145/2939672.2939754 , abstract =
-
[38]
Towards Data Science , author =
Node2vec explained graphically , url =. Towards Data Science , author =. 2021 , file =
work page 2021
-
[39]
Using a cognitive network model of moral and social beliefs to explain belief change
-
[40]
Rethinking the Role of Demonstrations: What Makes In-Context Learning Work?
Min, Sewon and Lyu, Xinxi and Holtzman, Ari and Artetxe, Mikel and Lewis, Mike and Hajishirzi, Hannaneh and Zettlemoyer, Luke , month = oct, year =. Rethinking the. doi:10.48550/arXiv.2202.12837 , abstract =
work page internal anchor Pith review Pith/arXiv arXiv doi:10.48550/arxiv.2202.12837
-
[41]
Analyzing Uncivil Speech Provocation and Implicit Topics in Online Political News
Magu, Rijul and Hossain, Nabil and Kautz, Henry , month = jul, year =. Analyzing. doi:10.48550/arXiv.1807.10882 , abstract =
work page internal anchor Pith review Pith/arXiv arXiv doi:10.48550/arxiv.1807.10882
-
[42]
A semantic embedding space based on large language models for modelling human beliefs
-
[43]
Benchmarking zero-shot stance detection with
Aiyappa, Rachith and Senthilmani, Shruthi and An, Jisun and Kwak, Haewoon and Ahn, Yong-Yeol , month = mar, year =. Benchmarking zero-shot stance detection with. doi:10.48550/arXiv.2403.00236 , abstract =
-
[44]
and Ahn, Yong-Yeol , month = jan, year =
Park, Jaehyuk and State, Bogdan and Bhole, Monica and Bailey, Michael C. and Ahn, Yong-Yeol , month = jan, year =. People,. doi:10.48550/arXiv.2101.04737 , abstract =
-
[45]
Tahmasbi, Fatemeh and Chug, Aakarsha and Bradlyn, Barry and Blackburn, Jeremy , month = mar, year =. Gun. doi:10.48550/arXiv.2403.09254 , abstract =
-
[46]
BERTopic: Neural topic modeling with a class-based TF-IDF procedure
Grootendorst, Maarten , month = mar, year =. doi:10.48550/arXiv.2203.05794 , abstract =
work page internal anchor Pith review Pith/arXiv arXiv doi:10.48550/arxiv.2203.05794
-
[47]
Social. Diabetes Care , author =. 2018 , pages =. doi:10.2337/dc17-2144 , abstract =
-
[48]
Nature Mental Health , author =
Network temperature as a metric of stability in depression symptoms across adolescence , volume =. Nature Mental Health , author =. 2025 , note =. doi:10.1038/s44220-025-00415-5 , abstract =
-
[49]
Using a cognitive network model of moral and social beliefs to explain belief change , volume =. Science Advances , author =. 2022 , pages =. doi:10.1126/sciadv.abm0137 , abstract =
-
[50]
Information Processing & Management , author =
Utilizing statistical physics and machine learning to discover collective behavior on temporal social networks , volume =. Information Processing & Management , author =. 2023 , pages =. doi:10.1016/j.ipm.2022.103190 , abstract =
-
[51]
Proceedings of the International AAAI Conference on Web and Social Media , author =
Unifying the. Proceedings of the International AAAI Conference on Web and Social Media , author =. 2025 , pages =. doi:10.1609/icwsm.v19i1.35860 , abstract =
-
[52]
Proceedings of the AAAI/ACM Conference on AI, Ethics, and Society , author =. 2024 , pages =. doi:10.1609/aies.v7i1.31612 , abstract =
-
[53]
Paino, Maria and Claggett, Jennifer L. and Kitchens, Brent , title =. Sociological Inquiry , volume =. 2025 , doi =. https://onlinelibrary.wiley.com/doi/pdf/10.1111/soin.70030 , abstract =
-
[54]
Proceedings of the International AAAI Conference on Web and Social Media , author =
Discovering. Proceedings of the International AAAI Conference on Web and Social Media , author =. 2024 , pages =. doi:10.1609/icwsm.v18i1.31427 , abstract =
-
[55]
The psychological drivers of misinformation belief and its resistance to correction , volume =. Nature Reviews. Psychology , author =. 2022 , note =. doi:10.1038/s44159-021-00006-y , abstract =
-
[56]
Vaccine hesitancy: a structured review from a behavioral perspective (2015–2022). , volume =. Psychology, Health & Medicine , author =. 2025 , note =. doi:10.1080/13548506.2024.2417442 , abstract =
-
[57]
Social support and physical health , author=. Health Psychology , volume=. 1983 , publisher=
work page 1983
-
[58]
Health promotion international , volume=
Health literacy as a public health goal: a challenge for contemporary health education and communication strategies into the 21st century , author=. Health promotion international , volume=. 2000 , publisher=
work page 2000
-
[59]
A systematic review of interventions in primary care to improve health literacy for chronic disease behavioral risk factors , author=. BMC family practice , volume=. 2012 , publisher=
work page 2012
-
[60]
Health behavior and health education: Theory, research, and practice , volume=
The health belief model , author=. Health behavior and health education: Theory, research, and practice , volume=
-
[61]
Social Psychology Quarterly , pages=
Testing the health belief model: LISREL analysis of alternative models of causal relationships between health beliefs and preventive dental behavior , author=. Social Psychology Quarterly , pages=. 1986 , publisher=
work page 1986
-
[62]
Partisan Differences Over the Pandemic Response Are Growing , author =. 2020 , month = jun, url =
work page 2020
-
[63]
Intelligent Medicine , author =
Social media study of public opinions on potential. Intelligent Medicine , author =. 2022 , pages =. doi:10.1016/j.imed.2021.08.001 , abstract =
-
[64]
JMIR Public Health and Surveillance , author =
Tracking. JMIR Public Health and Surveillance , author =. 2020 , note =. doi:10.2196/19273 , abstract =
-
[65]
Nature Human Behaviour , author =
Affective polarization, local contexts and public opinion in. Nature Human Behaviour , author =. 2021 , note =. doi:10.1038/s41562-020-01012-5 , abstract =
-
[66]
Elusive consensus:. Science Advances , author =. 2020 , note =. doi:10.1126/sciadv.abc2717 , abstract =
-
[67]
Human behavior and emerging technologies , author =
Political polarization drives online conversations about. Human behavior and emerging technologies , author =. 2020 , pmid =. doi:10.1002/hbe2.202 , abstract =
-
[68]
Journal of Medical Internet Research , author =
Political. Journal of Medical Internet Research , author =. 2021 , note =. doi:10.2196/26692 , abstract =
-
[69]
Pew Research Center , author =
Republicans,. Pew Research Center , author =. 2020 , file =
work page 2020
-
[70]
Journal of the American Medical Informatics Association , author =
Why do people oppose mask wearing?. Journal of the American Medical Informatics Association , author =. 2021 , pages =. doi:10.1093/jamia/ocab047 , abstract =
-
[71]
Erickson and Zhuo Jing-Schmidt , title =
Jun Lang and Wesley W. Erickson and Zhuo Jing-Schmidt , title =. PLoS ONE , year =. doi:10.1371/journal.pone.0250817 , url =
-
[72]
Social Media + Society , author =
Polarization. Social Media + Society , author =. 2021 , note =. doi:10.1177/20563051211048413 , abstract =
-
[73]
Ideological Differences in Epistemic Motivation: Implications for Attitude Structure, Depth of Information Processing, Susceptibility to Persuasion, and Stereotyping , author=. 2014 , url=
work page 2014
-
[74]
Kraft and Milton Lodge and Charles S
Philip W. Kraft and Milton Lodge and Charles S. Taber , title =. The ANNALS of the American Academy of Political and Social Science , year =
-
[75]
Public and Scientists' Views on Science and Society , author =. 2015 , month = jan, url =
work page 2015
-
[76]
Funk, Cary and Kennedy, Brian , month = dec, year =. The
- [77]
-
[78]
The muddled science on teens and social media , url =. Science Forever , author =
-
[79]
The great rewiring: is social media really behind an epidemic of teenage mental illness? , volume =. Nature , author =. 2024 , note =. doi:10.1038/d41586-024-00902-2 , abstract =
-
[80]
Researchers. The New York Times , author =. 2024 , keywords =
work page 2024
-
[81]
Proceedings of the International AAAI Conference on Web and Social Media , author =
The. Proceedings of the International AAAI Conference on Web and Social Media , author =. 2022 , keywords =. doi:10.1609/icwsm.v16i1.19377 , abstract =
-
[82]
Identifying and characterizing social media communities: a socio-semantic network approach to altmetrics , volume =. Scientometrics , author =. 2021 , pmid =. doi:10.1007/s11192-021-04167-8 , abstract =
-
[83]
Public Health in Practice , author =
Social network research hotspots and trends in public health:. Public Health in Practice , author =. 2021 , pages =. doi:10.1016/j.puhip.2021.100155 , abstract =
-
[84]
Software survey:. Scientometrics , author =. 2010 , keywords =. doi:10.1007/s11192-009-0146-3 , abstract =
- [85]
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