Historical Origins.  
Early Precursors (19th Century).  
The dress reform movement emerged in the mid-19th century as a response to the physical constraints imposed by Victorian fashion, particularly corsets and voluminous skirts, which reformers argued deformed the body and compromised health. Corsets, by tightly compressing the torso, reduced lung capacity, weakened respiratory and abdominal muscles, and irritated the skin, while also contributing to poor digestion and fainting spells from restricted breathing.  Advocates, often aligned with the first wave of feminism and temperance efforts, promoted looser garments to enable natural posture, greater mobility, and prevention of conditions like organ displacement and elevated blood pressure.  
A pivotal development occurred in 1851 when Elizabeth Smith Miller, a U.S. suffragist and philanthropist, adopted the "bloomer costume"—a knee-length skirt paired with loose Turkish-style trousers—while tending her garden and managing household duties, seeking attire that allowed unhindered movement without trailing fabrics or constrictive undergarments. This practical ensemble gained visibility through Amelia Bloomer's promotion in her newspaper The Lily, where it was defended as a rational alternative that prioritized bodily function over ornamental distortion, sparking public controversy and debate on women's attire.  
In Britain, the movement formalized with the establishment of the Rational Dress Society in London in 1881, under the leadership of Viscountess Harberton and other reformers, which condemned the "irrational" elements of contemporary dress such as tight-lacing and heavy petticoats for exacerbating health risks including incomplete lung expansion and circulatory strain. The society organized exhibitions and publications to demonstrate hygienic, lightweight alternatives, emphasizing empirical evidence of fashion's physiological toll and advocating for clothing that accommodated the body's inherent proportions rather than enforcing artificial ideals. Though met with ridicule and limited adoption due to entrenched social norms, these efforts critiqued the causal link between restrictive dress and bodily harm, establishing early principles of garment-based body autonomy that later influenced fat acceptance and body positivity movements.  

Fat Acceptance Movement (1960s–1970s).  
The fat acceptance movement originated in the United States during the late 1960s, drawing inspiration from contemporaneous civil rights, feminist, and disability rights activism, building on earlier precursors like the Victorian dress reform efforts against body-constricting norms. This initial wave focused on anti-shaming and combating discrimination against fat individuals. A pivotal early event occurred on May 14, 1967, organized by Steve Post and Lew Louderback, when approximately 500 people gathered in New York's Central Park for a "fat-in" protest, modeled after anti-war sit-ins, to publicly denounce discrimination and stigma faced by overweight individuals in employment, social settings, and media portrayals.  
In 1969, engineer William (Bill) Fabrey established the National Association to Aid Fat Americans (NAAFA)—later renamed the National Association to Advance Fat Acceptance—in New York City, motivated by the discrimination endured by his wife, Joyce, who faced workplace bias and social ostracism due to her body size. The organization, initially comprising around 50 members, focused on advocating for legal protections against weight-based discrimination, challenging restrictive airline seating policies, and fostering self-esteem among fat individuals through support groups and publications like the NAAFA Newsletter. By emphasizing civil rights analogies, NAAFA sought to reframe obesity not as a personal failing but as a protected characteristic akin to race or gender, though it initially tolerated dieting among members while prioritizing anti-bias efforts.  
The 1970s saw the movement's radicalization, particularly through the formation of the Fat Underground in 1970 by NAAFA dissidents including Vivian Mayer (pseudonym Aldebaran) and Judy Freespirit, who rejected accommodationist approaches in favor of "fat liberation" rhetoric borrowed from gay and women's liberation fronts. Operating primarily in California, the group critiqued dieting industries and medical models pathologizing fatness as tools of patriarchal control, arguing that weight stigma exacerbated rather than mitigated health issues. In 1973, they issued the "Fat Liberation Manifesto," which declared fat oppression a feminist issue tied to bodily autonomy and called for rejecting weight loss as a societal imperative. This factional split highlighted tensions within the movement: NAAFA's pragmatic focus on rights versus the Underground's ideological push against any normalization of thinness ideals, influencing subsequent zines, protests, and alliances with radical therapy circles.  

Expansion and Waves (1980s–2000s).  
During the 1980s, the fat acceptance movement formalized its structure and gained visibility through media appearances and organizational growth. The National Association to Advance Fat Acceptance (NAAFA), originally founded in 1969, adopted its current name in this decade to emphasize advocacy over mere support, reflecting a shift toward political activism. Fat activists frequently appeared on daytime talk shows, challenging the diet industry as a fraudulent enterprise that profited from repeated weight loss failures, with empirical data showing 95% of dieters regaining weight within five years. Internationally, the movement expanded with the formation of groups like the London Fat Women's Group in the mid-1980s, marking the globalization of fat liberation efforts. In 1980, the Fat Activists Together (FAT) conference in New Haven, Connecticut, convened the first national gathering of radical fat feminist activists, fostering networks for ongoing mobilization.  
The 1990s saw intensified activism, including public protests and cultural productions that amplified the movement's reach, aligning with a wave promoting inclusive wellness paradigms. Activists staged demonstrations outside the White House, targeted gyms with discriminatory advertising, and organized street performances to normalize larger bodies. The "Fatosphere" emerged through zines and early online forums, providing platforms for fat voices; Marilyn Wann launched the FAT!SO? zine in the mid-1990s, which evolved into her 1998 book FAT!SO? Because You Don't Have to Apologize for Your Size, advocating unapologetic fat pride and critiquing weight-based discrimination. In 1998, NAAFA coordinated the Million Pound March in Los Angeles, a large-scale event drawing hundreds to protest size stigma. This period also birthed the Health at Every Size (HAES) paradigm, with the Association for Size Diversity and Health (ASDAH) promoting it as an alternative to weight-focused interventions, emphasizing intuitive eating and joyful movement amid growing evidence of dieting's inefficacy.  
Into the 2000s, the movement transitioned toward digital dissemination and terminological evolution, laying groundwork for broader body positivity. Early social platforms like Facebook and Tumblr facilitated fat communities, enabling sharing of personal narratives and resources that prefigured the "body positive" framing, though fat acceptance retained focus on anti-discrimination over general self-esteem. HAES gained traction with publications like Lindo Bacon's 2008 book Health at Every Size, synthesizing prior activism into a framework rejecting weight loss as a health proxy, supported by studies showing no long-term benefits from calorie restriction. Despite expansion, the era coincided with rising U.S. obesity prevalence—from 23.2% in 1988–1994 to 30.5% by 1999–2000—prompting critics to question the movement's emphasis on acceptance amid public health data linking severe obesity to comorbidities like diabetes and cardiovascular disease. 


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