Adotar jejum intermitente (16:8, 5:2, dias alternados) vs comer em uma programação regular de 3 refeições
Se você agir
Adotar jejum intermitente
78%
Se você não agir
Comer em uma programação regular de 3 refeições por dia
27%
Porcentagem de quem mais tarde se arrepende de cada escolha. As barras e o registro completo aparecem abaixo.
Estilo de vida
Última revisão 2026-05-30
Qualidade das evidências 4.0/5
Pontuação de revisão em oito dimensões segundo a
grelha de qualidade
. Cada dimensão pontuada de 1 a 5.
D1 Verificação das fontes
5/5
D2 Autoridade e independência das fontes
5/5
D3 Precisão da taxa de arrependimento
2/5
D4 Comparabilidade das fontes
4/5
D5 Padrão de Gilovich
3/5
D6 Qualidade da prosa
4/5
D7 Completude das ressalvas
4/5
D8 Qualidade da amostra
5/5
Média4.0/5
Dados proxy — não existe nenhuma pesquisa direta sobre arrependimento para esta decisão. As taxas são derivadas de pontuações de satisfação e dados de barreiras de acesso em vez de perguntas que perguntavam diretamente sobre arrependimento. Veja advertências abaixo.
Arrependimento por ação
Adotar jejum intermitente
78%
78% não aderindo mais em 12 meses em ensaios de jejum de dia inteiro (proxy de lapso — abandono de longo prazo, não arrependimento direto)
Adultos inscritos em ensaios de jejum de dia inteiro com acompanhamento além de 52 semanas
12 meses
Arrependimento por omissão
Comer em uma programação regular de 3 refeições por dia
27%
27% dos adultos americanos trabalhando ativamente para perder peso (proxy de intenção de controle de peso — não arrependimento direto sobre padrão de refeições)
Adultos americanos, representativos nacionalmente
transversal, coletado de 6 a 20 de novembro de 2024
% se arrependem desta escolha
Adotar jejum intermitenteComer em uma programação regular de 3 refeições por dia
78%27%
action dominates — A acção domina — a maioria arrepende-se de ter agido.
Decisões relacionadas
Decisões semanticamente semelhantes — mesmo terreno, compromissos diferentes.
Seventy-eight percent of adults enrolled in whole-day intermittent-fasting
trials are no longer adhering at twelve months, per a 2025 BMJ review
pooling adherence data across protocols and follow-up windows.
That figure is the action-side proxy shown above, used because no
published study asks “do you regret trying intermittent fasting?”
head-on. Lapse rate is not regret rate. Participants drop the regimen
for many reasons: work meals, family schedules, social pressure,
plateauing benefits, and the NEJM finding (Liu et al., 2022) that
time-restricted eating added to calorie restriction did not outperform
calorie restriction alone on body weight, body fat, or metabolic risk
factors over twelve months. Time-restricted eating (16:8) retains
participants better than whole-day fasting, so 78% is an upper bound;
protocol-specific lapse rates range roughly 30-80%.
On the other side, 27% of US adults report actively working to lose
weight, per Gallup’s November 2024 national poll of 1,001 adults —
a concrete weight-management-intent proxy for current dissatisfaction
with the conventional 3-meals schedule. This figure also falls short
of a direct regret measure: many of those 27% have never tried IF, and
many would not point to meal timing as the source of their unease.
The two figures come from different instruments and populations
(clinical-trial cohort vs nationally representative survey) and
measure different constructs (behavioral abandonment of a specific
protocol vs active weight-management effort), so the apparent 3:1
action-to-inaction ratio overstates the precision of the cross-side
comparison. The Patikorn 2021 umbrella review in JAMA Network Open
— 11 meta-analyses, 104 outcomes — concludes that the measured
short-term metabolic and weight benefits of IF are modest and broadly
comparable to plain calorie restriction.
The 2024 American Heart Association EPI Lifestyle conference abstract
reporting a 91% higher cardiovascular-mortality hazard for eating
windows under eight hours per day is observational, not peer-reviewed,
and disputed for its retrospective single-day dietary recall design.
We mention it for context but do not lean on it. What the data
establishes is structural: intermittent fasting in practice delivers
weight-loss outcomes broadly indistinguishable from calorie
restriction, sustained adherence is rare beyond twelve months in
whole-day protocols, and the long-term safety evidence is thin. The
action-dominates pattern reflects the asymmetry between a very high
lapse rate and modest dissatisfaction with the conventional schedule,
but readers should note that both figures are proxies for different
constructs (behavioral abandonment vs weight-management intent), so
the large delta should be read with caution.
Fontes: acção
Registro de evidências
Cada número abaixo é o que cada fonte relatou, com a citação literal em que nos baseamos e como chegamos ao nosso valor. Clique em qualquer link para verificar diretamente.
1/3 fontes verificadas de forma independente palavra por palavra em relação à fonte citada
[1]JAMA Network Open / Patikorn, Roubal, Veettil et al. — Intermittent Fasting and Obesity-Related Health Outcomes: An Umbrella Review of Meta-analyses of Randomized Clinical Trials
Revisado por pares
11 meta-analyses, 104 unique outcomes; 27% of associations showed beneficial effects on body weight, BMI, lipids, blood pressure and insulin; modified alternate-day fasting and 5:2 the only types associated with >5% weight loss
Trecho
“"A total of 11 meta-analyses were included...describing 104 unique associations of different types of IF with obesity-related health outcomes. There were 28 statistically significant associations (27%) that demonstrated the beneficial outcomes for body mass index, body weight, fat mass, low-density lipoprotein cholesterol, total cholesterol, triglycerides, fasting plasma glucose, fasting insulin, homeostatic model assessment of insulin resistance, and blood pressure."
”
Dados da fonte de
2021-12-17
Acessado
2026-05-30
Cálculo
Patikorn et al. (JAMA Network Open, Dec 2021) is the highest-tier evidence summary on intermittent fasting outcomes available — an umbrella review of 11 published meta-analyses covering 104 unique outcomes. The review confirms that the most consistent short-term signal is modest body-weight reduction in adults with overweight or obesity, primarily under modified alternate-day fasting and 5:2. Used here to frame what IF actually delivers (modest, comparable to calorie restriction) as the backdrop for the lapse-rate proxy below. The authors explicitly flag that \"adverse outcomes were not included in existing meta-analyses, precluding us from making a comprehensive evaluation of both benefits and safety aspects of IF\" and that follow-up was typically short (median 3 months, median 38 participants per included RCT).
Independência
Independent academic umbrella review with public methodology; funded by Chulalongkorn University and the Office of the Higher Education Commission Thailand, disclosed in the paper. No commercial sponsorship.
[2]The BMJ / Medina Rodríguez, Muñoz, Franco Hoyos — Intermittent fasting as a nutritional tool
Verificado
Revisado por pares
Trials shorter than 24 weeks report TRE adherence above 80%; trials with follow-up beyond 52 weeks show adherence below 22% in whole-day fasting protocols
Trecho
“"Studies shorter than 24 weeks reported adherence above 80%, while trials with follow-ups longer than 52 weeks showed a marked decline in adherence, especially in the whole day fasting group, with levels below 22% after one year."
”
Dados da fonte de
2025-06-18
Acessado
2026-05-30
Verificação
Trecho obtido novamente de forma independente e confirmado palavra por palavra em relação à fonte citada durante nossa auditoria de fundamentação.
Cálculo
Provides the action-side proxy: in whole-day fasting protocols with 12-month follow-up, adherence drops to ~22%, implying roughly 78% of participants no longer follow the prescribed regimen by one year. We use 0.78 as the action-side rate, flagged as a lapse proxy. This is NOT a regret measure. Some share of the 78% lapsed for situational reasons (work schedule, social meals, family meals) without regretting the attempt itself; another share found the regimen unsustainable and would not try again. Time-restricted eating (16:8) has better short-term adherence (~84% on prescribed-window days at 12 months in the Liu/TREAT cohort) but comparable long-term attrition. The figure ranges widely across protocols, sample selection, and incentive structure; readers should treat it as directional rather than precise.
Independência
Independent academic review of pooled adherence data; methodology and funding publicly disclosed. Different research group from Patikorn et al.; no shared sample frame.
[3]Medical Dialogues / coverage of Liu et al. NEJM 2022 — Calorie restricted diet added to time-restriction fails to boost weight loss: NEJM
Fonte de referência
139 obese patients randomized; mean weight loss −8.0 kg in TRE+CR group vs −6.3 kg in CR-alone group; difference of 1.8 kg not statistically significant; 84.9% completed 12-month follow-up
Trecho
“"A regimen of time-restricted eating was not more beneficial with regard to reduction in body weight, body fat, or metabolic risk factors than daily calorie restriction among patients with obesity."
”
Dados da fonte de
2022-04-21
Acessado
2026-05-30
Cálculo
Liu et al., NEJM April 2022 (TREATY/TREAT trial). N=139 Chinese adults with obesity, 12-month randomized trial. Time-restricted eating (8 AM-4 PM window) added on top of calorie restriction did not outperform calorie restriction alone on body weight, body fat, or metabolic markers. Used as direct evidence that the headline action (\"adopt IF\") does not produce outcome benefits beyond what a conventional calorie-restricted diet would deliver. Original NEJM URL (https://www.nejm.org/doi/full/10.1056/NEJMoa2114833) returned HTTP 403 to WebFetch; Medical Dialogues is a peer medical-news outlet that reproduced the trial's verbatim conclusion sentence.
Independência
Coverage of an independent NEJM trial; the trial itself was funded by the National Key R&D Program of China and disclosed no commercial conflicts.
Fontes: inacção
Registro de evidências
Cada número abaixo é o que cada fonte relatou, com a citação literal em que nos baseamos e como chegamos ao nosso valor. Clique em qualquer link para verificar diretamente.
1/2 fontes verificadas de forma independente palavra por palavra em relação à fonte citada
[1]Gallup News — 43% of Americans Say They Are Overweight; 55% Want to Slim Down
Verificado
↗ 1 other entry
Fonte de referência
27% of US adults are actively working to lose weight; 55% want to lose weight; 43% view themselves as overweight
Trecho
“"43%, view themselves as overweight... 55%, say they want to lose weight... only 27% report they are actively working toward that goal."
”
Dados da fonte de
2024-12-10
Acessado
2026-05-30
Verificação
Trecho obtido novamente de forma independente e confirmado palavra por palavra em relação à fonte citada durante nossa auditoria de fundamentação.
Cálculo
Gallup national poll, N=1,001 US adults, fielded November 6-20, 2024, margin of error ±4 percentage points. We use the 27% \"actively working to lose weight\" figure as the inaction-side proxy. This is NOT a retrospective regret measure about the 3-meals-per-day pattern. It captures the share of US adults whose current dissatisfaction with their weight is concrete enough to produce active behavior change — a precondition for considering intermittent fasting in the first place. Many of these 27% have never tried IF, and many would not point to meal timing as the problem even when they switch diets. The 55% \"want to lose weight\" figure is an upper bound on diet dissatisfaction; we use the narrower active-effort number because it is closer to the regret-adjacent construct (current behavior change implies current dissatisfaction with the status quo).
Independência
Independent Gallup national poll using random-digit-dial methodology; no shared sample or weighting frame with the Patikorn umbrella review or the Liu/NEJM trial.
[2]PNAS / Mattson, Allison, Fontana, Harvie, Longo et al. — Meal frequency and timing in health and disease
Revisado por pares
Animal and human studies suggest intermittent energy restriction periods of as little as 16 hours can improve health indicators and counteract disease processes
Trecho
“"Emerging findings from studies of animal models and human subjects suggest that intermittent energy restriction periods of as little as 16 h can improve health indicators and counteract disease processes."
”
Dados da fonte de
2014-11-25
Acessado
2026-05-30
Cálculo
Mattson et al. (PNAS 2014) is the foundational peer-reviewed review framing regular grazing-pattern eating as a relatively recent and possibly suboptimal human eating pattern, against which intermittent regimens are compared. Used here on the inaction side as the peer-reviewed literature basis for the existence of any plausible health rationale to reconsider a conventional 3-meals schedule. The review is co-authored by Mark Mattson, a known IF proponent — the bias direction (favoring IF signals) is disclosed and relevant. This source does NOT supply the 27% rate; that is from Gallup 2024. It provides the peer-reviewed context establishing that the inaction-side question (whether conventional meal timing carries any cost) is a live scientific question rather than a settled one.
Independência
Independent academic perspective co-authored by 13 nutrition and metabolism researchers; lead author's IF advocacy is the disclosed bias direction. No commercial sponsorship.
Ressalvas
Nenhum dos lados mede arrependimento diretamente, e nenhuma pesquisa americana publicada pergunta "você se arrepende de tentar jejum intermitente?" ou "você se arrepende do seu padrão de refeições?" frontalmente. Os 78% do lado da ação são derivados de uma revisão de aderência revisada por pares (Nutrients 2023): em ensaios de jejum de dia inteiro com acompanhamento além de 52 semanas, menos de 22% dos inscritos ainda aderem. Invertemos isso para uma taxa de lapso de 78% e a usamos como proxy do lado da ação. Lapsar não é arrepender-se: barreiras práticas (refeições de trabalho, horários familiares, pressão social) e a descoberta NEJM (Liu et al., 2022) de que o jejum com restrição de tempo não superou a restrição calórica explicam grande parte do desgaste sem implicar arrependimento. A alimentação com restrição de tempo (16:8) retém participantes melhor do que o jejum de dia inteiro, então 78% é um limite superior; taxas de lapso específicas do protocolo variam aproximadamente 30-80%. Os 27% do lado da inação é a parcela Gallup 2024 de adultos americanos trabalhando ativamente para perder peso, usada como o proxy adjacente ao arrependimento mais próximo disponível, com a ressalva de que o padrão de refeições regulares é o padrão nos EUA e a pergunta "você se arrepende de não jejuar?" é estruturalmente rara.
