Evidence

Roughly one-third of US adults report short sleep, only about 15% consistently sleep 7–9 hours on most nights by objective monitoring, whether duration is declining is a genuine self-report-versus-objective conflict, and short and extreme sleep are consistently more prevalent among Black, American Indian, Alaska Native, Native Hawaiian and Pacific Islander adults and those with lower education or income.

Reviews and trials of a static stretch performed immediately before a maximal strength, power or speed effort. The sources' conclusions are not yet recorded in this library, so this entry states no effect.

Limiting added sugar is part of the pattern dietary guidelines converge on: a comparison of food guides reports the shared message of less added sugar and saturated fat (Reedy 2008), the AHA recommends reduced salt and added sugars (Lichtenstein 2006), and a meta-analysis identifies sugar-sweetened beverages among the harmful dietary factors for cardiometabolic disease (Micha 2017).

Reviews and trials on the neuromuscular changes of ageing and on adjunct training modalities: Granacher 2008 reports reduced maximal and explosive force and postural control with ageing, McKinnon 2017 reports that power deficits are more pronounced with aging than strength loss and may be a more sensitive marker, and trials report that strength and flexibility declined after three months of detraining (Carvalho 2008) and that older women were unable to maintain cardio-respiratory fitness, lipid, glycemic and hemodynamic profiles after three months of detraining (Leitão 2019).

The trainable skill of rapidly accelerating, decelerating, and changing direction.

Air pollution exposure is linked to higher cardiovascular, diabetes and dementia risk; personal-scale habits that reduce exposure are not covered by the research reviewed here.

Any structured, progressive resistance-training program reliably increases strength and muscle size; a minimum regular dose improves muscle structure and function, so the practical reading is to start and keep training.

Sherrington 2016 (meta-analysis, 88 studies, 19,478 participants) reports a 21% reduction in falls from exercise as a single intervention in community-dwelling older people, with larger effects from programmes that challenge balance and are of a higher dose; Chen 2023 reports that Tai Chi significantly reduced fall risk and improved balance.

Reviews and trials of balance, proprioceptive, sensorimotor and neuromuscular training: Zhong 2025 reports improved dynamic balance but no significant effect on static balance in older adults, Hübscher 2012 reports reductions in lower-limb, knee and ankle injuries of 39 to 54%, and several sources report inconsistent or null results on the neuromuscular and joint-position-sense mechanisms.

Trials and surveys of group identification and community belonging: a group-identification program reduced loneliness more than usual care, with stronger belonging to multiple groups (Haslam 2019), and community identification is reported to relate to well-being through social support and reduced loneliness (McNamara 2021).

Beyond strength and size, resistance training improves physical function and bone density in older adults, with a promising signal for cognition, improved body composition and lipid markers in older adults, mixed cardiovascular effects, and blunted explosive strength when aerobic work is added.

Whether speaking two languages protects the aging brain: prospective studies did not find protection from dementia while retrospective studies suggested later symptom onset (Mukadam 2017), and bilinguals were on average 3.45 years older at symptom onset in one meta-analysis (Li 2025).

For endurance, block periodization shows a reproducible small-to-moderate advantage over traditional periodization, and pyramidal or polarized intensity distributions outperform threshold training; for novices the model chosen does not materially matter.

Cognitive behavioural therapy for insomnia is a structured programme delivered by a trained clinician, not something you assemble yourself. van Straten 2017 (meta-analysis, 87 randomised trials) reports it effective in treating insomnia, whether as components or the full package, and Baglioni 2020 (network meta-analysis) reports that none of the interventions it compared were “superior to CBT-I”.

For weight loss, total energy intake matters more than any specific macronutrient split.

Regular aerobic activity reduces cardiovascular risk factors, and in cardiac rehabilitation lowers total and cardiac mortality.

Higher cardiorespiratory fitness is associated with lower risk of chronic disease and mortality, making it a meaningful health target.

Weeks of regular static stretching, with range of motion, maximal strength and muscle size as the outcomes, and range of motion after stretching stops: what the syntheses on this entry measured. Their conclusions are not yet recorded in this library, so this entry states no effect.

Decades of education, complex work, and mental activity track with a brain that copes better with aging, an association, not a guarantee.

Why practicing balance while thinking (talking, counting, reacting) mirrors real life, and what the reviews report for gait, balance and cognition.

Reviews of multidomain programs: two-thirds of multidomain trials showed cognitive improvement (Castro 2023), programs combining cognitive training with physical exercise were reported as particularly effective (González 2025), and mind-body exercise, cognitive training and physical exercise showed positive effects against passive controls (Seok 2024).

Meditation programs had moderate evidence of improving anxiety and depression (Goyal 2014), mindfulness apps reduced perceived stress, anxiety and depression with no significant effect on distress (Gál 2020), mindfulness-based programs reduced rumination, stress, depression and anxiety against passive control (Querstret 2020); short-term training did not improve attention or executive function (Lao 2016), burnout results were more equivocal (Lomas 2018), and immune effects are tentative (Black 2016).

Meta-analyses of randomised trials report that DASH reduced systolic blood pressure by 3.2 mmHg and diastolic by 2.5 (Filippou 2020) and by 6.74 and 3.54 mmHg (Saneei 2014), with larger reductions under energy restriction and in hypertensive subjects; a Cochrane review reports no clear differences in infarction, stroke or mortality against comparators, with low to very low certainty (Bensaaud 2025).

Reviews report that water deficits beyond about 2% of body mass degrade endurance performance, accentuated by heat stress (Cheuvront 2003), with a lesser or inconsequential effect in temperate conditions (Shirreffs 2008); strength and power are reported as largely unaffected up to about 2–4% (Maughan 2015); and a meta-analysis reports that fluid intake after dehydration improved continuous exercise performance, concluding it may do so under heat stress even when rehydration is incomplete (McCartney 2017).

Mediterranean-diet adherence is associated with lower cognitive impairment and dementia risk, but evidence is largely observational.

Adherence to validated diet-quality indices is associated with lower all-cause mortality across large cohorts (English 2021; Jankovic 2014), with cardiovascular findings varying by index and region (Jankovic 2015; Struijk 2014), and greater adherence to any of several healthy eating patterns was associated with lower cardiovascular risk (Shan 2020).

Emphasizing unsaturated fats over saturated fats is the mainstream position, but the saturated-fat guideline evidence is genuinely contested.

Social-connection studies in populations beyond older adults: multicomponent programs for caregivers reported effects on burden, depression, health and social support (Abrahams 2018); peer support reduced depression and anxiety in perinatal mothers (Shah 2024); 80% of student interventions based on social support groups, social interaction or reflective exercises were effective for loneliness (Ellard 2022); loneliness and isolation were more prevalent among resettled refugees than population norms (Nguyen 2024); and effects differed by gender, culture and age (Shukla 2020; Blessin 2022; Michalski 2024).

Reviews report that digital programs can reduce loneliness under certain conditions, particularly with group or social components (Hansen 2025); that information and communication technology reduced depression and anxiety with limited effect on social isolation (Bermúdez Endrino 2025); that analogue, community-based programs tended to be more effective than technological ones (Bergsträsser 2026); that social prescribing has a positive influence on mental health and wellbeing (Dubbeldeman 2024) while robust conclusions cannot yet be made (Cooper 2022); and that time on social networking sites is only weakly related to well-being (Huang 2017).

Digitally delivered emotional-wellness programs: reviews report small effects of mental-health apps on symptoms and well-being and a medium effect on emotion regulation (Eisenstadt 2021), VR-based programs as effective as traditional methods (Montana 2020), and no conclusive evidence that mobile technology or human support enhanced outcomes (Zhu 2025).

Soh 2020 (meta-analysis, 33 studies) reports that digital CBT-I reduced the Insomnia Severity Index by 5.00 points against control after treatment and by 3.48 at one year, with face-to-face CBT-I producing greater improvement; Hwang 2025 reports fully automated digital CBT-I less effective than therapist-assisted CBT-I; Linardon 2024 reports higher dropout for apps; and Le 2025 reports healthcare and societal cost savings for digital CBT-I against face-to-face care.

Benefit begins well below the 150 minutes a week target and keeps rising with more activity before plateauing, so there is no threshold you must clear before anything counts.

Drinking to thirst and programmed drinking similarly affected 1–2 h endurance performance in a meta-analysis, with any advantage of drinking to thirst likely trivial (Goulet 2019); cool drinks below 22 °C increased fluid consumption and hydration during exercise (Burdon 2012); hypotonic drinks better maintained plasma volume than isotonic drinks (Rowlands 2021); post-exercise rehydration volume needs to exceed the deficit by about 150% with sodium (Sharp 2006); and caffeine up to 400 mg a day did not produce dehydration (Ruxton 2008).

Reviews and trials comparing dynamic stretching with foam rolling or self-myofascial release, PNF stretching and post-activation potentiation strategies before activity. The sources' conclusions are not yet recorded in this library, so this entry states no effect and no comparison.

A meta-analysis and trials comparing dynamic and ballistic (bouncing) stretching with static stretching for flexibility and range of motion. The sources' conclusions are not yet recorded in this library, so this entry states no effect and no comparison.

Body weight tracks energy in vs energy out over time.

For muscle mass, strength and sarcopenia-related mobility in older adults, the sources on this entry compare exercise with and without protein or other nutritional support: network meta-analyses rank exercise plus nutrition highest (Zhao 2025; Lin 2026), while Sirikul 2024 concludes that “the efficacy of nutritional supplements remains unclear” and Kim 2025 reports that the benefits of nutritional interventions remain limited.

Sella 2022 reports that only physical activity improved objectively measured sleep in older adults, Riedel 2024 reports exercise improved objective and subjective sleep in insomnia with larger effects at higher intensity, and the reviews of other non-drug approaches report results ranging from effective (acupuncture, Hu 2023) to mixed (nutrition, Knowlden 2016) and inconclusive (single-plant herbal aids, Kim 2018).

Training modestly raises the body's rate of fat oxidation during exercise.

Fernandes 2014 reports that financial-literacy interventions explained about 0.1% of the variance in financial behaviours, with effects decaying over time, and suggests a narrower just-in-time role tied to specific behaviours; Miller 2015 reports effects on savings and record-keeping but not on credit default.

In observational studies, financial strain is associated with physical and biological outcomes — oxidative stress, inflammation, blood-pressure and metabolic profiles, self-rated health and mortality — and long-term hardship with poorer late-life health (Samuel 2024; Kahn 2006).

Five years of structured endurance training raised fitness but did not reliably beat following national activity guidelines for brain structure, cognition, or the overall cardiovascular risk profile.

Many exercise modes improve cardiorespiratory fitness in the sources on this entry, from walking (Oja 2018) and water-based training (Faíl 2021) to Pilates at sufficient dose (Pessôa 2023) and exercise snacks (Rodríguez 2025); for sport, Oliveira 2022 concludes that "Sport may have a positive impact on health outcomes in people aged 60+" and Oja 2015 reports VO2max gains but that "the evidence base appears currently underdeveloped in both quantity and quality"; structured exercise regardless of type was effective in older adults (Azimkhani 2025).

Increased fluid intake halved recurrent kidney-stone risk in a review of randomised trials (Fink 2013); replacing sugar-sweetened beverages with water may offer a modest weight-loss benefit while general water intake did not significantly change adiposity (Chen 2024); for overactive bladder, reducing fluid intake reduced symptoms (Callan 2015); and a systematic review reports no benefit from eight glasses a day in people without kidney stones (Wood 2018).

Evidence on individual food groups is heterogeneous: red and processed meat track with cardiovascular risk in large cohorts, dairy guidance is contested and raises an equity question given lactase non-persistence in most of the world's adults, the dietary guidelines' ounce-for-ounce swaps between protein foods are questioned on metabolic grounds, and vegetarian and vegan patterns are achievable but risk shortfalls in vitamin D, vitamin E and choline.

Living near green space is associated with lower mortality, consistently and dose-responsively, and with lower cardiometabolic risk.

Reviews report green space associated with lower depression and anxiety (Liu 2023; Patwary 2022) and better mental health (Bryer 2024); Gascon 2015 finds limited evidence that the link is causal, and Noordzij 2021 finds no significant association in four ageing cohorts.

Interval training often yields the largest fitness gains and is more time-efficient, but is not strictly necessary where adequate volume is achieved at moderate intensity; intensity and amount can substitute for one another.

Meta-analyses report that HIIT lowered blood pressure (Edwards 2023; Carpes 2021), improved flow-mediated dilation against continuous training and controls in people with metabolic disorders and cardiovascular diseases but not in those free of cardiometabolic diseases (Khalafi 2022) and against continuous training in groups including people with heart failure, hypertension, metabolic syndrome, coronary artery disease or type 2 diabetes (Ramos 2015), improved HDL cholesterol but not other lipids relative to continuous training (Wood 2019), improved hemostatic and arterial-stiffness markers (Jiao 2025) and can enhance mitochondrial indices in overweight and obese adults (Hadjispyrou 2023).

Syntheses report that interval training raised VO2max, with gains greater than endurance training in healthy adults (Milanović 2015), more effective than moderate continuous training in older adults (Yang 2023; Poon 2021), effective at home in healthy adults and patients (Tsuji 2023), and, in overweight or obese persons, moderate continuous training better than sprint intervals with no significant difference from HIIT (Rugbeer 2021).

HIIT improves quality of life and, in trials, stress, anxiety, depression and affect; enjoyment during sessions is genuinely mixed, and dropout is comparable to or better than traditional exercise where reported.

Reviews and studies report financial strain associated with depression (Guan 2022), serious psychological distress (Tsuchiya 2020) and suicide risk (Roelfs 2023), which Roelfs 2023 reports as weak after accounting for physical and mental health.

Whether mild dehydration measurably impairs cognition is unresolved in the sources: one meta-analysis reports that dehydration impaired cognitive performance, particularly above 2% body-mass loss (Wittbrodt 2018), another reports no significant impairment in any domain (Goodman 2019), and a systematic review reports little consistency across studies (Katz 2021); in older adults, cross-sectional studies report hydration status associated with processing-speed performance (Singer 2023; Singer 2024), and a narrative review reports consistent findings only in children (Benton 2011).

Population reference intakes cluster around 3.7 litres a day of total water for men and 2.7 for women, but a wide range is compatible with being adequately hydrated and the popular eight-glasses rule has no scientific support behind it.

Duffy 1996 (randomised trial) concludes that light is the primary synchronizer of the human circadian pacemaker; van Maanen 2016 (meta-analysis, 53 studies) reports light therapy effective for sleep problems overall, with most effect sizes small to medium; Xu 2022 reports higher light at night associated with a 22% higher prevalence of sleep problems; and the reviews of blue-blocking glasses differ, from substantial evidence of reduced sleep-onset latency (Hester 2021) to no significant difference from standard lenses (Lawrenson 2017).

Living in a way that matches what you value — authenticity, a sense of meaning, a moral identity you recognise — is associated with greater well-being; the association is consistent in direction and almost entirely correlational.

Reviews of loneliness interventions differ: several meta-analyses report reduced loneliness (Yu 2023; Hansen 2025; Coppola 2025; Teoh 2021; Yang 2025), others report effects that were not statistically significant or were limited (Grillich 2023; Jarvis 2020; Coll-Planas 2016), and group-based, participatory and theory-based formats more often reported improved outcomes (Dickens 2011).

Meta-analyses report low-intake dehydration in 24% of non-hospitalised older adults and 34% of long-term-care residents (Parkinson 2023) and, as a suggested pooled estimate, 23% of hospitalised older adults at or near admission (Hooper 2026, where 5039 of 14,398 participants, 35%, were dehydrated across the included studies); a systematic review reports dehydration associated with higher mortality and longer hospital stays (Edmonds 2021); intervention groups consumed 300.93 mL more fluid a day than usual care in a meta-analysis of 2 studies, which reports limited evidence overall and concludes that behavioural interventions “appear promising for improving hydration” (Bruno 2021); and serum osmolality is described as the gold standard for assessment (Lambert 2022).

Massage, compression, foam rolling and contrast therapy reliably reduce soreness and perceived fatigue, with modest cuts in damage markers, while their effects on maximal performance are small; emerging modalities show promising but lower-certainty signals.

A sense of purpose in life is associated with lower mortality across meta-analyses of cohort studies (Sutin 2026; Cohen 2016), and meaning in life with physical health indicators (Czekierda 2017); these are observational associations.

Interventions promoting meaning in life had an effect of SMD 0.85 against passive control and 0.32 against active control (Manco 2021); meaning-centered therapies improved quality of life and reduced psychological stress (Vos 2018) and meaning therapies, one type of existential therapy, had large effects on positive meaning in life (Vos 2015); spiritual and religious interventions reduced anxiety, stress and depression (Gonçalves 2015); brief workplace formats showed no evidence of effectiveness (Ivandić 2017).

Mindfulness-based programs improved anxiety, depression, distress and well-being in non-clinical adults compared with no intervention, with no significant difference against specific active control conditions (Galante 2021).

Aerobic training increases muscle mitochondrial content, by a similar amount across endurance, interval and sprint training.

Only 12.3% of US adults met fruit recommendations and 10.0% met vegetable recommendations in national surveillance (Lee 2022); shortfalls are reported among SNAP and food-pantry users (Jain 2022) and in pregnancy (El Habbal 2023; Filatava 2023; Caut 2019); awareness of the Dietary Guidelines is reported as low and declining (Macias 2021), while MyPlate awareness rose modestly from 19.5% to 24.6%, with slower gains in disadvantaged groups (Kinderknecht 2024); and nutrition knowledge is reported as patterned by income, education and residence (Xu 2020; Glick 2025).

Delivering more behavioural recommendations and integrating across domains: Zhang 2024 reports a positive, linear association between the number of recommendations and behavioural and clinical change, Montano 2014 higher success rates for comprehensive workplace interventions (OR 2.71), and Heaney 1997 that low-intensity, short-duration awareness programs may be insufficient.

Why programs blending balance with strength, power, and gait work often outperform single-component training.

Cohort syntheses report long daytime napping of an hour or more associated with cardiovascular risk and mortality (Sun 2022, which describes the evidence for most meta-analyses as weak or suggestive), coronary heart disease (Salari 2022) and all-cause mortality (Liu 2015), and daytime napping associated with stroke in a dose-dependent manner (Jin 2021), while Du 2026 reports that napping under 60 minutes maximised cognitive enhancement (SMD 0.69) and napping over 60 minutes correlated with a 30% higher risk of coronary heart disease.

Practice makes you better at the practiced task (near transfer). Broad gains to everyday thinking (far transfer) are weak and contested.

Residential and chronic noise are associated with higher cardiovascular and dementia risk.

For muscle size, periodized and non-periodized programs produce similar results: growth appears driven primarily by accumulated volume and effort rather than by how that volume is sequenced.

Periodized training likely offers a small advantage over non-periodized training for maximal strength, but the effect is inconsistent and shrinks toward zero when total work is equated.

Cohort meta-analyses report higher adherence to plant-based patterns associated with lower type 2 diabetes risk, strengthened when built from healthful plant foods (Qian 2019), and healthy plant-based indices associated with lower cardiovascular disease and mortality while unhealthy indices are associated with higher cardiovascular risk (Zhang 2025; Quek 2021); evidence specific to vegan diets is described as very limited (Schlesinger 2022).

Dinis 2018 (systematic review) reports poor sleep quality affecting 10-50% of college students, and pooled prevalence meta-analyses report poor sleep quality in 51% of police officers (Garbarino 2019), 69% of military personnel and veterans (Bai 2023) and 52.30% of pregnant women in Ethiopia (Zeleke 2024). Meta-analyses report CBT-I effective in menopausal women (Moon 2025), pregnant women (Zheng 2022; Visvanathan 2025) and daytime workers (Takano 2023), and possibly effective in older adults (Huang 2022); in shift workers Slanger 2016 could not determine whether interventions reduce sleepiness, and Nickel 2025 reports student sleep-education programs improved knowledge and sleep quality but not sleep duration.

Effort, tempo and rest fine-tune results for advanced trainees but are second-order next to load, volume and effort; reaching near failure matters more than reaching absolute failure.

Large prospective studies repeatedly link a stronger sense of purpose to lower mortality risk and better health markers.

Quality of social contacts was more strongly associated with well-being in later life than quantity (Pinquart 2000); contact frequency showed a modest mortality association with null subgroups (Shor 2015); and larger network size a small protective association (Schutter 2022).

Okubo 2016 (meta-analysis, 7 studies, 660 participants) reports that reactive and volitional stepping interventions reduced falls among older adults by approximately 50%; Gerards 2017 reports perturbation-based training appears to be a feasible and effective approach to falls reduction in clinical settings; Allin 2020 reports improved reactive balance and fall incidence after laboratory slips but not trips.

Experiments and trials comparing cognitive reappraisal, expressive suppression and acceptance: reappraisal produced larger reductions in negative emotion than acceptance in several experiments, suppression was least effective in one and linked to worse outcomes in surveys, both reappraisal and acceptance reduced distress against control in a trial, and reappraisal's effectiveness is reported as context-dependent.

The capacity to adapt well to stress and bounce back, and how training may strengthen it.

Responding to your own struggles with kindness, common humanity, and mindful awareness.

Zhao 2013 “suggests a positive association between long sleep duration and colorectal cancer”, Chen 2018 reports long sleep associated with colorectal cancer in categorical but not dose-response analysis, and Li 2022 concludes that abnormal sleep duration “might be linked to several adverse cancer-related outcomes”; long sleep is also associated with cancer mortality (Ma 2016; Wilunda 2022); short sleep with cancer risk in Asian populations in categorical but not dose-response analysis (Chen 2018); and for breast cancer He 2015 reports circadian disruption associated with higher risk and no significant effect for short sleep, Yang 2014 reports light at night associated with higher risk and no significant sleep-duration dose-response, Pagkalidou 2026 reports evening chronotype associated with higher risk, and Zhao 2013 reports long sleep associated with a 21% lower risk of hormone-related cancers such as breast cancer.

Cappuccio 2010 (meta-analysis, 1,382,999 participants) reports both short and long sleep associated with greater risk of death (RR 1.12 and 1.30); Yin 2017 reports each hour below 7 hours increasing all-cause mortality risk by 6% and each hour above by 13%; Lauderdale 2015 (a cross-sectional study of adults aged 62-90) reports that the long-sleep association with fair or poor health may be an artefact of survey-based sleep measurement; and Hall 2015 reports the short-sleep hazard attenuated after adjustment for inflammation and health status.

Ruan 2025 (meta-analysis, 42 randomised trials) reports that sleep hygiene education as a single therapy improves insomnia but is inferior to CBT-I, partial CBT-I, exercise and acupressure, and notes that 85.71% of trials had high risk of bias, so robust evidence from well-designed trials is needed; Chung 2018 reports it significantly less efficacious than CBT-I; and Irish 2014 reports the direct effects of its individual recommendations in the general population largely untested.

When and how consistently you sleep carries health signal beyond total hours: irregular timing tracks with worse cardiometabolic markers, higher dementia risk and higher mortality, and social jet lag with obesity and depression.

Short and long sleep both track with cardiovascular risk, with the lowest risk near seven hours; hypertension associates chiefly with short sleep, stroke risk rises most steeply at the long end, and the one causal-inference test of atrial fibrillation found no effect.

Short sleep is linked with higher risk of type 2 diabetes, obesity and metabolic syndrome, with a U-shape for diabetes and the lowest risk at seven to eight hours.

Scott 2021 (meta-analysis, 65 trials) reports that improving sleep produced medium effects on composite mental health, depression, anxiety and rumination, and Takano 2023 reports CBT-I improved depression and anxiety in daytime workers; CBT-I's effect on depressive symptoms is reported as significant by Palagini 2024 and as a possible positive effect by Ballesio 2018.

Wu 2018 (meta-analysis of cohorts) reports both short and long sleep associated with higher risk of cognitive disorders, with the lowest risk at 7 to 8 hours; Liang 2018 reports a pooled risk ratio per additional hour of 0.99, with 7 hours tending to carry the least risk; and cross-sectional studies report cognitive performance peaking at about 7 hours (Tai 2022; Richards 2017).

Social isolation and loneliness are associated with higher all-cause mortality across many meta-analyses (Nakou 2025; Naito 2023; Rico-Uribe 2018; Harris 2023) and with coronary heart disease and stroke (Valtorta 2016); lower social-contact frequency was associated with higher mortality, with moderate effect sizes and null subgroups (Shor 2015).

Social engagement and social activities are associated with lower risk of cognitive decline (Joshi 2023), and lack of social connection is described as a risk factor for dementia (DeAngelis 2026).

Having few social contacts (isolation) is objectively linked to higher risk of heart disease, stroke, and early death.

Religious and spiritual engagement is associated with better mental health across reviews, with a small overall effect in longitudinal meta-analysis (r = 0.08; Garssen 2020); negative spiritual coping was associated with more mental-health diagnoses and symptom severity while positive coping had an ameliorating effect in veterans (Smith-MacDonald 2017).

Qualitative and mixed-methods reviews describe spirituality as a coping resource across bereavement, end-of-life care, forced migration, illness and disaster; an umbrella review identified meaning-making, spiritual struggle and intervention as pathways with small-to-moderate effects (Asgari 2026); one meta-analysis found no genuine growth for meaning and spirituality after major life events (Mangelsdorf 2018).

Meta-analyses, systematic reviews and trials of static stretching and joint range of motion, in single sessions and over weeks, across hamstrings, ankle dorsiflexion and other muscle groups. The sources' conclusions are not yet recorded in this library, so this entry states no effect.

Reviews and trials of dynamic and static stretching in a warm-up, with power, sprint and jump performance as the outcomes, on their own and inside a full task-specific warm-up. The sources' conclusions are not yet recorded in this library, so this entry states no effect and no comparison.

Whether range-of-motion gains reflect stretch tolerance (a sensory change) or mechanical change in the muscle-tendon unit: what the reviews and trials on this entry measured. Their conclusions are not yet recorded in this library, so this entry states no mechanism.

Meta-analyses and trials of how much stretching was done, at what intensity, for how long and how often, with range of motion as the outcome. The sources' conclusions are not yet recorded in this library, so this entry states no dose-response.

Reviews and one trial of stretching after exercise, with soreness, recovery and cramp among the outcomes. The sources' conclusions are not yet recorded in this library, so this entry states no effect.

Reviews and one trial of stretching and agility, balance, post-exercise recovery, muscle cramp and running economy. The sources' conclusions are not yet recorded in this library, so this entry states no effect.

Meta-analyses and trials of static stretching and passive stiffness of the muscle-tendon unit, in single sessions and over weeks. The sources' conclusions are not yet recorded in this library, so this entry states no effect on stiffness.

A meta-analysis, a systematic review and randomised trials of multi-component neuromuscular warm-up programs such as FIFA 11+, with injury or physical performance as the outcome. The sources' conclusions are not yet recorded in this library, so this entry states no injury effect.

Job clubs, welfare-rights advice, guaranteed income, financial coaching and energy-efficiency schemes are the interventions these sources studied; Birkenmaier 2026 reports that most financial effects of coaching were small, with a mix of significant and non-significant results, and Yashadhana 2023 reports holistic initiatives that met basic needs first aligned with positive financial-wellbeing outcomes.

Reviews and trials of Tai Chi, exergaming and virtual reality, perturbation-based and stepping training and dual-task training for balance in older adults: each is reported to improve balance or reduce falls in its own sources, and one trial reports functional-task training as more effective than resistance training for balance (Mohammed 2021).

Hirshkowitz 2015 reports an expert-panel consensus of 7 to 9 hours for adults and 7 to 8 for older adults; Dzierzewski 2026 reports 74% of 133 meta-analyses consistent with those recommendations and none contradictory; Chaput 2020 reports 7 to 8 hours a day most favourably associated with health; and Li 2021 reports higher mortality and disease risk with each hour of deviation in either direction.

Green space is not uniformly good for everyone.

The model behind the multilevel intervention designs this review names as the emerging consensus recommendation.

A pattern rich in vegetables, fruit, legumes, whole grains, olive oil, nuts and fish: cohort meta-analyses report higher adherence associated with lower all-cause mortality (Sofi 2010; Bonaccio 2018; and Soltani 2019, which reports that low-quality evidence from prospective cohorts suggests an inverse association), a meta-analysis of randomised trials reports reduced major adverse cardiovascular events but no significant effect on all-cause mortality (Sebastian 2024), and an umbrella review reports robust evidence for mortality, cardiovascular disease, cancer incidence, neurodegenerative disease and diabetes (Dinu 2018).

Exercise need not be continuous or long to improve fitness: accumulated short bouts match continuous exercise, and low-volume interval formats improve fitness, though claims about very-low-volume formats should stay measured.

Static stretching before exercise, and longer holds after or in standalone sessions: what the reviews and trials on this entry measured. Their conclusions are not yet recorded in this library, so this entry states no effect of timing.

Higher intake of ultra-processed foods is associated with worse health outcomes in an umbrella review and a meta-analysis of observational studies (Lane 2024; Leonberg 2025); the sources report association, not cause.

Loneliness, the gap between the connection you want and what you have, is linked to depression and worse mental health.

VO2max is the ceiling of oxygen your body can use, and training reliably raises it.

Total aerobic volume, alongside intensity, independently drives fitness adaptation; the two can substitute for one another.

Walkable neighbourhoods are associated with lower obesity, type 2 diabetes and hypertension (Chandrabose 2018), which reports the evidence on whether physical activity explains this as inconclusive.

Meta-analyses and trials of total stretching exposure, intensity and how often it is spread across the week, with range of motion as the outcome. The sources' conclusions are not yet recorded in this library, so this entry states no dose-response.

The financial-strain-to-health link is conditioned by psychosocial resources: tangible social support buffered it (Åslund 2014), and sleep problems mediated and moderated it (Chai 2025); in cross-sectional studies, self-efficacy, resilience and self-control appear in models of financial and emotional well-being (Dare 2022; Curry 2025; Radianto 2026).

Financial well-being is described in reviews as a dynamic, multidimensional construct, studied mostly as a subjective state, whose definition and measurement are still disputed.

Regular cold-water immersion in hypertrophy-focused resistance training may reduce muscle growth and adaptive signalling, which makes it situational rather than default.

When weekly volume is matched, split and full-body routines produce similar strength and muscle growth, and so do most other program-design choices; the structure can follow adherence and preference.

Spending time in natural environments is associated with lower stress and better mood versus built settings.

Individual burnout interventions help, and their effects fade in about a month unless the work itself changes.

Very short, all-out sprints improve VO2max and aerobic and anaerobic performance despite tiny total exercise time.

Why a sense of control over how you work is a recurring ingredient of occupational well-being.

Workplace mindfulness programs reduce perceived stress and burnout and improve mindfulness, with no effect on depression or anxiety and only parity with active comparators; components are unstandardised and benefits are short-term, though even a fully online program worked against wait-list.