Science and debate
Scientific insights, critical perspectives and the ongoing debate on gender care and gender identity.
For some years the science around gender identity and gender care has been at the centre of an international reassessment. Systematic literature reviews from Sweden (SBU), Finland (COHERE), the United Kingdom (Cass Review) and Norway consistently reach the same conclusion: the scientific basis for early medical interventions in minors is remarkably weak. The original Dutch Protocol, which was presented for decades as the gold standard, turns out on methodological analysis not to be replicable on crucial points.
At the same time the explosive rise in adolescent referrals since 2010 raises scientific questions that are not answered by reference to "growing acceptance" alone. Rapid-onset gender dysphoria, social media dynamics, peer clusters, and the high comorbidity with autism, eating disorders and trauma are all subjects of active research. The desistance research shows that most children with dysphoria come to accept their body if things take their undisturbed course.
This section collects the scientific and public debate: research and statistics, critical perspectives from feminism, philosophy and clinical psychology, international comparisons, brain and genetics research, and the insights from the sociology and psychology of gender. Every claim with explicit source references and attention to methodological limitations.
What this chapter covers
This overview follows the scientific research and the public debate that arises around it. The two are inseparable: studies are published or refused in particular academic climates, methodological standards are applied or abandoned in political contexts, and peer review functions differently in subjects where public pressure is high.
What the Dutch Protocol claimed
The original Dutch Protocol (Cohen-Kettenis & Van Goozen, 1990s-2000s) held that carefully selected adolescents with persistent dysphoria benefit from early medical intervention. The selection criteria were strict; the population was small and well defined. From around 2010 the protocol expanded internationally to much larger and more heterogeneous populations — without the original strictness of selection scaling up with it.
The Cass Review
The Cass Review (UK, 2024) systematised the literature and concluded that the evidence base for paediatric medical transition is 'remarkably weak'. No retention of studies that fail methodologically, no interpretative goodwill — a strict quality appraisal as is customary in other medical subspecialties. The criticism ran parallel to earlier systematic reviews in Sweden and Finland.
Important research traditions
- Affirmative branch of research: meta-analyses of patient reports after transition, often with short follow-up and high drop-out, generally concluding with positive outcomes.
- Critical branch of research: systematic reviews with GRADE methodology, longer follow-up, explicit attention to selection and publication bias, generally reaching more cautious conclusions.
- Detransition research: a recent and methodologically difficult field, with the Vandenbussche study (2021) and Littman studies (2018-2024) as reference points. Figures vary widely depending on definition and length of follow-up.
- Paediatric biomedical branch: research into the effects of puberty blockers on bone density, brain development and long-term outcomes, with the original Carmichael et al. (2021) and later re-analyses as key publications.
Methodological points of contention
Three dimensions of disagreement:
- Definitions — who is a 'detransitioner'? Someone who stops hormone treatment? Someone who returns legally? Someone who undergoes surgical reversals? Studies use different definitions and therefore arrive at incompatible figures.
- Length of follow-up — a 2-year follow-up gives a completely different picture from a 10-year follow-up of the same population. Regret and detransition increase with time.
- Selection bias — who is followed up? Patients loyal to the clinic? Everyone regardless of outcome? Those who have left the clinic often disappear from the follow-up.
The public debate
Scientific discussion rarely takes place in sterile isolation. Journals that publish critical research receive persistent calls for retraction. Researchers who question the affirmative consensus experience professional consequences (Kathleen Stock, Kenneth Zucker). The effect: a chilling effect that narrows the breadth of what appears in journals.
What this means for the reader
Anyone who wants to follow the debate must realise that 'the science' is not a monolith and that methodological rigour is not applied uniformly. A serious way of reading requires looking up original studies, reading methodology sections, and valuing GRADE evaluations above citation frequency.
Opinion pieces
Foto: Aheed Baithul Nafia via PexelsThe American engine behind international gender policy — what lgbtdatabase.com makes visible
An American database links 1,600 companies to 2,500 LGBT organizations, documenting one billion dollars in donations. What this means for the Dutch policy debate.
Foto: Gabriel Schincariol Cavalcante via PexelsIsaiah 5:20 as a mirror — the great reversal in the gender debate
A three-thousand-year-old line from Isaiah diagnoses what is happening in the Dutch gender debate — the reversal of good and evil, read in secular terms as well.
The Judge as the Final Arbiter — and Guidelines as a Cover
The guideline is both the problem and the get-out-of-jail-free card. Those who followed it acted with legal cover — even when the outcome was disastrous.
Is transgenderism a form of social brainwashing?
The critical dossier on the conversion law is available at conversiewet.nl.
Foto: Polina Zimmerman via PexelsNot affirming is not the same as causing harm
Edward Jansen: an opinion, a question or an honest doubt is not harm. On the difference between pain and injustice, between rejection and refusing to echo someone else.
Foto: Tima Miroshnichenko via PexelsWhy a Conversation About Identity Is So Difficult to Have
Edward Jansen: not unwillingness, not weakness, but a mechanism. On what happens when opinions and identity collide.
All topics
Foto: Ali Haider via PexelsCritical perspectives
Overview of scientific, psychological, and societal criticism of gender care — the Cass Review, SBU, COHERE, WPATH Files, and the Dutch Protocol.
Foto: Arturo A via PexelsInternational comparison
How do countries such as the Netherlands, the UK, Sweden and Finland provide gender care for young people? An international comparison of policies and guidelines.
Photo: JS 95, CC BY-SA 4.0, via Wikimedia CommonsBrains and Gender
What does neuroscience research say about gender identity and the brain? An overview of findings, limitations, and the scientific debate.
Photo: U.S. Air Force, public domain, via Wikimedia CommonsGenetics and Gender
What does genetic research say about gender identity? An overview of twin studies, GWAS research, and the role of prenatal hormones and epigenetics.
Foto: Emmanuel Codden via PexelsRapid-Onset Gender Dysphoria
What is Rapid-Onset Gender Dysphoria (ROGD)? An explanation of the controversial term, Littman’s 2018 study, and the scientific debate surrounding it.
Foto: Isak Fransson via PexelsDesistance
What is desistance in gender dysphoria? An explanation of the research, methodological criticism, and implications for gender care for children and young people.
Foto: dada _design via PexelsPsychology of Gender
How does gender identity develop psychologically? An explanation of gender dysphoria, comorbid disorders, gender-affirming care, and exploratory therapy.
Foto: Suzy Hazelwood via PexelsSociology of Gender
How do societies construct gender? An explanation of gender performativity, social construction, gender norms, intersectionality, and social influences.
Photo: U.S. Navy, public domain, via Wikimedia CommonsAAP guideline on transgender youth
The American Academy of Pediatrics’ position on care for transgender youth and the announced systematic review.
Photo: Vmenkov, CC BY-SA 3.0, via Wikimedia CommonsBias in Gender Research
Methodological bias in research on transgender healthcare: selection bias, loss to follow-up, the absence of control groups, and publication bias.
Photo: Holger.Ellgaard, CC BY-SA 4.0, via Wikimedia CommonsBränström 2019 — corrective update
The Swedish study by Bränström and Pachankis (2019) on mental health after transition, and the subsequent correction in 2020.
Photo: Choinowski, CC BY-SA 4.0, via Wikimedia CommonsCohort Studies in Transgender Care
Important cohort studies in transgender healthcare: the Amsterdam Cohort of Gender Dysphoria, the ENIGI network, and the Swedish population studies.
Image: NSW Ministry of Health, CIAP, CC BY 4.0, via Wikimedia CommonsThe Evidence Pyramid in Gender Care
What does the evidence pyramid say about the strength of evidence in gender-affirming care research? Systematic reviews, RCTs, cohort studies, and case studies.
Photo: Holger.Ellgaard, CC BY-SA 4.0, via Wikimedia CommonsDhejne 2011 — Swedish long-term study
Findings from the Swedish long-term study (Dhejne et al. 2011) on mortality and psychiatric outcomes after gender-affirming surgery.
Photo: ajay_suresh, CC BY 4.0, via Wikimedia CommonsEndocrine Society Guideline for Transgender Care
The Endocrine Society Clinical Practice Guideline (Hembree et al. 2017): the international endocrine guideline for transgender hormone therapy.
Photo: Faruk Tokluoğlu via PexelsGender exploratory therapy
What is gender exploratory therapy? The therapeutic approach that allows room to explore gender identity without a predetermined outcome.
Photo: Pelle Sten from Stockholm, Sweden, CC BY 2.0, via Wikimedia CommonsKarolinska 2021 — Swedish policy change
The 2021 Swedish policy change in which Karolinska University Hospital stopped providing hormone treatment to minors outside a research setting.
Photo: Farragutful, CC BY-SA 4.0, via Wikimedia CommonsLittman 2018 — Rapid-Onset Gender Dysphoria
Lisa Littman's 2018 PLOS ONE publication describing Rapid-Onset Gender Dysphoria and the methodological correction.
Photo: Erik Wannee, CC BY-SA 3.0, via Wikimedia CommonsDutch guidelines for transgender care
The Quality Standard for Transgender Healthcare in the Netherlands: development, stakeholders involved, and relationship to international guidelines.
Foto: Marta Nogueira via PexelsResearch and Statistics
An overview of scientific research and statistics on gender, gender dysphoria, and medical treatments. What do we know, and where are the gaps?
Photo: Paasikivi, CC BY-SA 3.0, via Wikimedia CommonsPALKO Finland 2020 — Finnish policy change
The Finnish PALKO/COHERE report (2020) on medical treatment for gender dysphoria in minors and its influence on national guidelines.
Photo: Michiel1972, CC BY-SA 3.0, via Wikimedia CommonsSteensma 2013 — desistance in children
Steensma et al. (2013) on factors associated with the persistence or disappearance of gender dysphoria between childhood and adolescence.
Foto: Stéf -b. via PexelsSystematic reviews in gender care
Overview of the key systematic reviews on puberty blockers and cross-sex hormones in young people (York, NICE, SBU, COHERE).
Foto: Tara Winstead via PexelsWatchful Waiting for Gender Dysphoria
Watchful waiting as a clinical approach to gender dysphoria in children: waiting, observing, and monitoring development without early intervention.
Foto: Yan Krukau via PexelsVasterman: The Battle Between Sex and Gender
Vasterman examines the withdrawn bill on self-identification and gender identity ideology. What carries more weight: sex or felt identity?
Foto: Jacky. T. R. Chou via PexelsVasterman: 1,728 percent growth in transgender healthcare since 2012
Peter Vasterman analyzes the figures: from 289 to 5,280 patients in ten years, the waiting list has grown by 300 percent, and 75 percent of adolescents are girls.
Foto: Leeloo The First via PexelsVasterman: 92,500 Dutch young people identify as trans or gender-diverse
Sex under 25: 3.3 percent of young people identify as trans or gender-diverse. Vasterman: 45 percent increase in five years, girls account for 63 percent.
Foto: Towfiqu barbhuiya via PexelsVasterman: U.S. Transgender Survey Shows Young, Non-Binary, Assigned Female at Birth
Vasterman analyzes the US Transgender Survey: 43 percent are aged 18–24, 55 percent were assigned female at birth, and 38 percent identify as non-binary. Not an innate condition.
Photo: Art Anderson, CC BY-SA 3.0, via Wikimedia CommonsJohn Money
Encyclopedic page about John Money: the term gender, the Reimer experiment, the fraud exposed in 1997, and its continuing impact on modern gender care.
Photo: Jakub Zerdzicki via PexelsROGD: sudden-onset gender dysphoria in teenagers
Rapid Onset Gender Dysphoria: teenagers — especially girls — suddenly declare themselves transgender. Social media, friends and comorbidities play a major role.
AI-generatedWhy Fewer and Fewer Young People Identify as Non-Binary or Trans
New research among young Americans shows a sharp decline in the number identifying as non-binary, trans or queer—after years of growth. What explains this reversal, and what does it say about the “social contagion” debate?
Is Rapid-Onset Gender Dysphoria a Distinct Clinical Presentation? New Study Calls for Recognition
Clinical psychologist Kenneth Zucker published an analysis in June 2026 arguing that 'rapid-onset' gender dysphoria in teenagers constitutes a distinct, recognizable pattern that deserves a place in future diagnostic manuals.
AI-generatedNew cohort study: autism significantly overrepresented among gender-diverse children — and access to care is unequal
A cohort study of 786 gender-diverse children and young people shows that autistic young people reach the same developmental milestones as their non-autistic peers, but consistently have less access to gender-affirming care — particularly autistic girls, who are less likely to begin a medical transition despite a greater psychiatric burden.
AI-generatedDutch Protocol research still lacks reliable evidence after 30 years, researchers conclude
A new critical analysis of three decades of research underpinning the Dutch Protocol concludes that there is still no methodologically robust evidence that puberty blockers and hormones are effective for young people with gender dysphoria.
AI-generatedGerman insurance data: diagnosis of gender dysphoria among young people proves highly unstable
An analysis of ten years of German health insurance data covering 14 million young people shows that, in most cases, a diagnosis of gender dysphoria had disappeared within five years—most notably among pubertal girls.
Foto: Shuaizhi Tian via PexelsMedicine as Restoration or as a Well-Being Project: What Does This Mean for Gender-Affirming Care?
Is the aim of medicine to restore normal function, or also to promote well-being and happiness? Drawing on Boorse, Daniels, Callahan, and recent literature on medicalization, this essay examines what that distinction means for puberty blockers, hormone treatment, and surgery in cases of gender dysphoria.
AI-generatedAmerican plastic surgeons: delay gender surgery until age 19
In a position statement on 3 February 2026, the American Society of Plastic Surgeons (ASPS) concluded that there is insufficient evidence for a favourable balance of benefits and risks of hormonal and surgical interventions in young people. It advises delaying gender surgery until at least age 19.
AI-generatedOverview of five Nordic countries: surgery for gender dysphoria remains reserved almost everywhere for adults
A review article by eleven Scandinavian surgeons and physicians in the Scandinavian Journal of Surgery maps out policies in Denmark, Sweden, Norway, Finland and Iceland. Its conclusion: with few exceptions, surgical procedures for gender dysphoria remain reserved for adults, while legal gender registration has become more permissive.
AI-generatedClinical psychologist Joe Burgo: why boys today are given no room to become men
In conversation with Sarah Mittermaier, psychologist Joe Burgo explains how the blank-slate view of gender, the disappearance of male role models, and shame surrounding male sexuality can push boys toward a transgender identity.
AI-generatedThe Eternal Boy: What a Jungian Perspective Reveals About Gender Ideology
Clinical psychologist Bret Alderman interprets trans-identification as a contemporary form of an ancient archetype: the puer aeternus, the eternal boy who resists boundaries and adulthood. His analysis sheds light on why this particular age, with its aversion to physical limitations, is so receptive to the idea that identity exists independently of the body.
AI-generatedThe ‘Yale Report’ Against the Cass Review: Science or a Legal Brief for the Court?
A non-peer-reviewed report published under Yale’s banner claims that the UK’s Cass Review “repeatedly misuses data.” It is now being used in more than a dozen US lawsuits—by the authors themselves, as paid expert witnesses.