Health Implications of Shift Work in Airline Pilots and Cabin Crew: A Narrative Review and Pilot Study Findings

This study employed hybrid research design, combining a cross-sectional survey with a narrative literature review. The purpose of this mixed approach was to integrate empirical data with existing evidence to provide a comprehensive overview of the health implications of shift work among airline personnel.

This pilot study was designed as an exploratory, non-hypothesis-driven investigation aimed at descriptively characterizing health- and nutrition-related patterns among aircrew. No a priori hypotheses were formulated, consistent with the observational and descriptive nature of the study.

The cross-sectional survey was conducted among airline personnel engaged in shift work, including both flight attendants and pilots. The study population consisted of 101 participants who met the inclusion criteria: age ≥ 18 years and current employment as either a flight attendant or a pilot. Recruitment was carried out using a purposive non-random sampling strategy. Participation was entirely voluntary and anonymous.

Data collection was based on the diagnostic survey method. A structured, self-administered questionnaire specifically developed for this study was used. The instrument was available in two language versions (Polish and English) and distributed electronically via a Microsoft Forms link. Respondents completed the survey independently.

The questionnaire consisted of 31 items, including single-choice, multiple-choice, Likert-scale and open-ended questions, covering the following thematic domains: (1) sociodemographic characteristics, (2) access to food and dietary behavior during flights, (3) appetite and taste perception changes, (4) eating patterns on duty vs. at home, (5) physical activity habits, (6) sleep quality and fatigue, (7) psychological well-being and stress, (8) chronic diseases and other health changes, (9) use of melatonin and dietary supplements, (10) awareness of occupational risks including cosmic radiation.

The questionnaire underwent expert content validation by two specialists in aviation medicine and two specialists in nutrition/public health, who assessed clarity, relevance, and coverage of pertinent health domains. Prior to data collection, the survey was pilot-tested on a group of 10 airline employees to ensure comprehensibility and accurate interpretation of items. Minor linguistic and structural adjustments were made accordingly. Due to the multidimensional character of the instrument, Cronbach's alpha was not applicable; however, internal logical consistency between related items was confirmed during pilot testing.

To capture perceived health changes over the course of an aviation career, the questionnaire included items assessing whether participants noticed the onset of new conditions since entering the profession.

Items referring to chronic medical conditions (e.g., thyroid dysfunction, hypertension, chronic fatigue) were designed to capture only previously diagnosed conditions. Participants were instructed to report exclusively medically established diagnoses.

This study utilized descriptive statistical methods, consistent with its exploratory design and primary objective of characterizing health- and nutrition-related patterns within the study population. The analytical framework prioritized comprehensive description over hypothesis testing, reflecting the study's foundational role in establishing a baseline understanding of population characteristics. Continuous variables are presented as means ± standard deviations, while categorical variables are reported as frequencies and percentages. All statistical analyses and data visualizations were performed using Microsoft Excel (Microsoft Corporation, Redmond, WA, USA).

This descriptive approach was deliberately selected to identify and characterize health and nutrition trends rather than to test predetermined hypotheses, thereby providing essential groundwork for future hypothesis-driven research.

The narrative review was designed to provide a comprehensive synthesis of multidisciplinary evidence on the health consequences of shift work and aviation-specific environmental exposures among flight crew. The review integrates findings related to circadian disruption, metabolic health, cardiovascular risk, nutritional challenges, sensory alterations, respiratory and endocrine function, gastrointestinal and microbiome balance, and evidence-based preventive strategies. Consistent with narrative review methodology, the aim was to summarize representative and conceptually relevant evidence across key thematic domains rather than to exhaustively identify all studies containing individual keywords.

A structured non-systematic literature search was performed in the PubMed, Scopus, and Google Scholar databases using combinations of keywords and Medical Subject Headings (MeSH): shift work, circadian rhythm, pilots, flight attendants, aviation, nutrition, sleep, melatonin, cardiovascular disease, cancer, hormones, radiation, microbiome, and occupational disorders. The search strategy was designed to ensure adequate coverage of major concepts and multidisciplinary evidence, not full retrieval and screening of all records returned by each keyword. Only peer-reviewed articles in English published between 2003 and 2025 were included.

This survey was anonymous and minimal risk, involving no intervention or collection of sensitive personal data. Participation was voluntary, and no identifying information (names, contact details, IP addresses) was collected. The study was conducted in accordance with the principles of the Declaration of Helsinki and complied with the general data protection regulations (GDPR). Data were securely stored in encrypted form and analyzed in aggregate to ensure full anonymity. Formal ethical approval was not required for this type of anonymous, non-interventional research, in accordance with institutional and national regulations.

A total of 101 aviation personnel participated in the study, comprising 84% flight attendants and 16% pilots, with 63% of participants being women. The majority were aged 18–35 (82%) and had a university degree (70%). A breakdown of work experience revealed 47% with 1–5 years and 34% with >5 years of aviation experience.

Analysis of occupational health outcomes revealed pronounced sleep and circadian rhythm disturbances, with 71% of participants reporting sleep problems and 89% experiencing frequent work-related fatigue (including 62% who reported fatigue during work and 62% after completing their duties). Nearly one-third of respondents (29%) reported developing chronic diseases after starting their aviation career, with the most common conditions being hypothyroidism (45% of those affected), chronic fatigue syndrome (36%), hypertension (27%), and mental health disorders (18%). Weight changes were also common, affecting 60% of participants, with 38% reporting weight gain and 22% reporting weight loss after starting their aviation career (Figure 1). These changes were frequently accompanied by self-reported appetite alterations and irregular meal timing.

Irregular working hours and circadian rhythm disturbances were frequently associated with changes in dietary behavior. Half of the respondents (50%) reported limited access to nutritious food during work shifts. Appetite changes were common, with 47% of participants reporting an increase in appetite and 21% reporting a decrease in appetite since beginning their employment in aviation.

Altered taste perception was reported by 63% of participants, most often describing meals consumed during flights as having a less intense taste compared to those eaten on the ground (Figure 2). Only 13% of respondents perceived the taste as more intense. Meal structure also differed substantially between workdays and days off. During flights, the majority (57%) consumed airline catering meals, 29% brought homemade food, and smaller groups relied on ready-made or snack-type options. Over 80% of participants reported differences in meal timing or composition between workdays and days off.

Melatonin supplementation was reported by 41% of participants, with 76% of them noting improved sleep quality and reduced difficulty falling asleep. The use of other dietary supplements was declared by 56% of participants. The most common were vitamin D (50% of supplement users), multivitamin complexes (43%), omega-3 fatty acids (43%), and magnesium (43%). Fatigue reduction and mood improvement were the primary motivations for supplement use.

Health literacy was high: 85% of participants were knowledgeable about the risks associated with exposure to ionizing radiation, and 92% were aware of the general health consequences of working in aviation. Despite this, only 50% reported adequate access to nutritious food during their workday. Interest in occupational health consultation services was significant: 55% expressed willingness to participate in preventive medical consultations, 23% were not interested, and 22% expressed uncertainty.

Among aircrew members, circadian rhythm disruptions trigger desynchronization of physiological processes and are associated with an increased prevalence of sleep disorders, adverse metabolic changes, and elevated cardiovascular risk [10,11]. Chronic fatigue and limited daylight exposure contribute to mood deterioration and depressive symptoms [12,13], while reduced sleep quality and irregular working hours result in diminished alertness and cognitive performance [14,15]. The biological basis involves disrupted circadian regulation of cortisol, melatonin, and core body temperature [25] with individual tolerance influenced by circadian clock gene variations (CLOCK, BMAL1, PER3) [26]. Chronic occupational stress further intensifies these effects by disturbing the hypothalamic–pituitary–adrenal axis, leading to flattened diurnal cortisol profiles and compromised recovery [27,28]. Recent evidence also confirms persistent trends of sleep disturbances and fatigue-related disorders among military aviators, underlining the chronic nature of circadian strain in this occupational group [29].

Aviation personnel face significant nutritional challenges due to frequent time-zone changes, confined cabin environments, and restricted access to high-quality food [16,17].

These occupational factors result in irregular meal timing, excessive snacking, heightened caffeine consumption, insufficient fruit and vegetable intake, and elevated saturated fat consumption [16,17]. Female cabin crew demonstrate higher rates of gastrointestinal complaints and snacking behaviors [17], while preliminary research indicates elevated overweight prevalence and poor dietary adherence [18].

Meal timing misalignment with biological rhythms exacerbates jet lag symptoms and metabolic dysfunction [7,21]. This combination of irregular eating, circadian misalignment, and restricted food variety creates persistent nutritional strain in aviation workers.

Recent evidence confirms that circadian misalignment reduces leptin levels while elevating glucose and insulin, thereby promoting weight gain [26]. Shift workers exhibit significantly higher BMI and metabolic syndrome prevalence compared to day workers [30], with increased consumption of energy-dense, nutrient-poor foods during working hours [16]. Contemporary research has documented specific nutritional deficits in military aviation personnel [31] and identified acute metabolic changes in fighter pilots [32]. Studies of chronobiological eating patterns reveal that meal timing disruption significantly affects total caloric intake and macronutrient distribution [33,34], while unfavorable meal scheduling contributes to circadian syndrome development [30]. Collectively, these findings underscore the complex relationship between disrupted schedules, altered metabolism, and inadequate diet quality among aircrew.

Diet quality is further affected by cabin environmental conditions that alter taste and smell perception. Cabin conditions characterized by low pressure, low humidity, and persistent engine noise significantly impair taste and smell perception, particularly reducing sensitivity to sweet and salty flavors. Airlines compensate by increasing sugar and salt content in onboard meals to maintain acceptable flavor profiles, consequently elevating caloric content and reducing nutritional quality [35].

Research demonstrates that altitude conditions substantially compromise gustatory function [35], with dry cabin air reducing saliva production and impairing taste bud function [36]. Low humidity environments (10–15% typical in aircraft cabins) reduce olfactory sensitivity by 25% [37], given that smell contributes significantly to overall flavor perception.

Recent advances in sensory science research conducted under aviation and space-analog conditions have identified methodological approaches for testing food acceptance under altered environmental conditions [38]. Experimental studies employing virtual reality and microgravity body postures demonstrate measurable changes in food odor perception and affective responses [39].Cabin humidity modeling research provides practical parameters for environmental control systems [40], while extreme isolation studies confirm progressive olfactory and gustatory function impairment over extended periods [41].

These environmental and sensory factors not only alter the dining experience but may also affect food intake and nutritional quality, thereby contributing indirectly to metabolic and cardiovascular strain. Excessive sodium intake from compensatory food formulations increases hypertension risk [42,43], while nutritional recommendations emphasize sodium reduction rather than increased intake particularly among populations at elevated cardiometabolic risk. Meta-analyses have confirmed that a reduction of approximately 2.3 g of dietary sodium per day significantly lowers blood pressure in both hypertensive and normotensive individuals. Contemporary evidence demonstrates dose-dependent cardiovascular benefits of sodium reduction [42,43] and clinical efficacy of salt substitutes [44].

Aircrew encounter specific cabin environmental conditions that adversely affect respiratory health. Low humidity (approximately 16% ± 5%) promotes dehydration of mucous membranes, while reduced cabin pressure alters breathing mechanics and elevated ozone concentrations irritate the airways [45,46]. Recent measurements confirm that cabin air contains increased concentrations of ultrafine particles, which fluctuate with engine power and ventilation settings [46], and significant levels of volatile organic compounds including tetrachloroethylene from cleaning agents and cabin materials [47]. Contemporary research demonstrates that contaminated cabin air events expose aircrew to complex mixtures of organophosphates, volatile compounds, and nanoparticles, with systematic reviews documenting associated health consequences and recommending standardized medical assessment protocols [48]. Carbon monoxide levels in cabins have been analyzed with recommendations for enhanced monitoring and lower occupational exposure limits for aircrew [49].

These findings suggest that even short-term exposures may lead to mucosal irritation, reduced breathing comfort, and increased vulnerability to respiratory infections [50]. Aviation-related microbiome alterations may further compromise respiratory health through disrupted microbial balance [51].

Pilots and flight attendants experience chronic exposure to cosmic ionizing radiation (CIR) and ultraviolet radiation, which has been associated with an increased risk of certain cancers, particularly melanoma and breast cancer [52]. This occupational hazard is further intensified by long flight hours, high-altitude exposure, and disrupted circadian cycles.

In addition to radiation and circadian misalignment, light exposure during night operations may further elevate cancer risk through suppression of nocturnal melatonin secretion. Melatonin acts as an endogenous oncostatic, antioxidative, and immune-modulating hormone, and its reduction has been shown to facilitate tumor growth mechanisms, as extensively described by Blask [53].

Large cohort studies with cumulative dose assessment demonstrate signals for melanoma and brain tumors in pilots [54]. Recent measurements confirmsignificant UVA transmission through cockpit windows, contributing to pilot melanoma risk [55]. Experimental evidence indicates that simulated cosmic radiation exposure activates breast tumorigenesis pathways involving estrogen receptor alpha (ERα), estrogen-related receptor alpha (ERRα), and secreted phosphoprotein 1 (SPP1) signaling, thereby providing biological plausibility for observed epidemiological associations [56].

Prospective biomarker studies reveal suppressed DNA repair capacity in flight attendants after air travel, with diminished repair of radiation-induced damage and 8-oxoguanine:cytosine (8-oxoG:C)lesions [57]. Contemporary research highlights the peak cancer incidence typically occurs between ages 55–79 in men and 50–74 in women, making long-term follow-up essential for aviation workers who begin careers at young ages. Current evidence supports cosmic ionizing radiation, circadian rhythm disruption, and longer aviation career duration as probable contributors to elevated cancer risk [58].

An additional methodological consideration relevant to the interpretation of these health outcomes is the structural confounding between age, job tenure, and long-haul route exposure. Airline long-haul and trans-meridian operations are disproportionately assigned to more senior crew members, creating systematic overlap between older age, longer flight experience, and greater circadian stressors [59]. Although formal eligibility rules vary across airlines, operational data indicate that seniority and long-haul duty frequently co-occur, making it difficult to isolate the independent effects of time-zone transitions from accumulated exposure [59,60]. Recent operational studies demonstrate that age can moderate the association between night-flight duration and sleep disturbances, suggesting that biological ageing and occupational tenure may jointly influence vulnerability to circadian disruption [60]. To strengthen causal inference, future work should incorporate seniority metrics, route history, and longitudinal duty-pattern tracking to avoid misattributing circadian-related morbidity solely to chronological age [7].

Female flight attendants face significantly elevated risks of reproductive and endocrine complications linked to cosmic ionizing radiation, circadian rhythm disruption, and occupational stressors. Comprehensive epidemiological evidence demonstrates increased reproductive health risks among flight attendants. McNeely et al. reported elevated rates of infertility, miscarriages, preterm births, and fetal abnormalities compared to the general population [61] while Grajewski et al. specifically identified a correlation between cosmic radiation exposure levels and miscarriage rates [62].

Recent research reveals concerning impacts on ovarian function, with flight crew showing significantly lower anti-Müllerian hormone (AMH) levels and accelerated ovarian reserve decline compared to controls [63]. Hormonal disruptions include elevated prolactin levels predisposing to infertility and menstrual disorders, occurring independent of flight frequency in both short-haul and long-haul attendants [63]. Thyroid dysfunction manifests as elevated TSH levels (2.59 vs. 1.52 mcIU/mL in controls) and increased prevalence of thyroid antibodies, with hypothyroidism reaching 4.7% in long-haul attendants compared to general population rates [64,65]. These effects arise from multiple mechanisms including cosmic radiation-induced DNA damage, circadian disruption of hypothalamic-pituitary axes, melatonin dysregulation, and occupational stress-mediated HPA axis activation [62,63,66].

Aviation personnel experience significantly higher rates of gastrointestinal disorders and microbiome alterations linked to cabin environmental conditions, circadian disruption, and occupational stressors. Systematic reviews of shift workers and flight crews demonstrate increased prevalence of dyspepsia, irritable bowel syndrome (IBS)-like symptoms, constipation, and work-related fatigue compared to day workers, with strongest associations in night/rotating shift schedules and long-haul operations [67,68]. Reduced cabin pressure (equivalent to 2400 m altitude) causes intestinal gas expansion and gastric distension, leading to upper gastrointestinal discomfort and slowed gastric emptying during flight [69].

Hypobaric hypoxia exposure induces intestinal inflammation, oxidative stress, mucosal barrier disruption, and microbiome shifts toward reduced diversity and increased pro-inflammatory taxa including Escherichia/Shigella, Blautia, and Dialister [70,71]. Circadian misalignment from irregular schedules disrupts gut–brain axis function, altering microbial communities and promoting systemic inflammation that contributes to digestive complaints and metabolic dysfunction [72]. While direct evidence for increased antibiotic-resistant strain transmission in commercial aircrew remains limited, confined cabin environments and crew rest areas create conditions that may promote microbial exchange and opportunistic organism proliferation [73].

Among the numerous occupational hazards confronting aircrew, cardiovascular diseases (CVDs) rank among the most prevalent, with risk strongly influenced by circadian rhythm disruption, occupational stress, prolonged sitting, and adverse cabin conditions [74,75,76].

Studies have shown that pilots are more often frequently overweight or obese (67% in New Zealand), physically inactive, exhibit insufficient fruit and vegetable intake, and sleep less than 7 h per day [75]. These lifestyle and occupational factors interact synergistically, thereby amplifying long-term cardiometabolic burden. Elevated CVD risk is also associated with impaired glucose and lipid metabolism, inflammation, and autonomic nervous system dysfunction. This risk increases after just 5 years of shift work, with an additional 7.1% increase for every subsequent 5 years [77].

The heightened susceptibility of pilots to CVDs is attributed to work characteristics involving high stress, prolonged immobility, and tasks requiring intense concentration [76]. Recent evidence shows that asymptomatic military aircrew demonstrate 12% prevalence of clinically significant coronary artery disease [78], while systematic reviews reveal high rates of cardiometabolic risk factors among airline pilots [75]. Contemporary meta-analyses demonstrate dose-dependent relationships between night shift work duration and cardiovascular events [79], with rotating shift patterns showing particularly adverse metabolic effects [80]. Organizational risk factors including irregular schedules and prolonged duty hours significantly affect aircrew health [81], while physical occupational exposures (cosmic radiation, pressure changes, noise) contribute additional health risks [82].

Evidence from Pereira et al. [84] on Norwegian Air Ambulance and Austrian Christophorus pilots showed that short naps of approximately 10 min effectively alleviate sleepiness and enhance alertness, whereas longer naps (>30 min) are counterproductive due to sleep inertia—a transient state of reduced vigilance and cognitive performance following awakening [85,86].

Melatonin supplementation has also demonstrated effectiveness in improving sleep quality and daytime functioning among shift workers [87,88]. Beyond regulating sleep, melatonin exhibits antioxidant, anti-inflammatory, and cardioprotective properties [89,90,91,92,93], with experimental studies demonstrating significant improvements in redox status and recovery in physically demanding occupations [91,92].

Randomized and clinical evidence demonstrates that melatonin improves sleep quality, cognitive performance, and multiple sleep parameters in shift workers, despite heterogeneity in dose and study design [94,95,96]. Its mechanisms extend beyond circadian alignment, encompassing anti-inflammatory and mitochondrial-protective actions that may also mitigate cancer risk [89,97]. Recent meta-analyses from 2023 further indicate that melatonin supplementation improves metabolic parameters such as insulin resistance and glycemic control, emphasizing its therapeutic potential beyond sleep regulation [98]. Systematic reviews recognize melatonin as one of the most widely recommended pharmacological tools to support night-shift adaptation and mitigate circadian desynchrony [99,100].

In operational contexts, comprehensive fatigue-management systems integrate melatonin use (0.5–3 mg, 30–60 min before sleep) with chronotherapy, restricting consecutive night duties (<3 nights), controlled morning light exposure (≈ 10,000 lux), and scheduled short naps or walking breaks during night operations [29,67,72,87,101].

In cases of sleep-disordered breathing, melatonin may serve as adjunctive therapeutic option in combination with diagnostic evaluation and targeted treatment [29,102]. Brief bouts of physical activity such as 5-min walking breaks every 30 min combined with light-based countermeasures effectively reduce operational sleepiness and maintain alertness [88,103].

Available evidence indicates that both the timing and composition of meals can significantly affect alertness, sleep quality, and metabolic homeostasis among shift workers. Dietary approaches such as adjusting macronutrient distribution (e.g., reducing carbohydrate intake at dinner), providing targeted snacks during extended night shifts, or restricting food intake to daytime hours have been shown to enhance alertness, reduce sleepiness, and stabilize mood [104,105,106].

Observational and field studies substantiate the real-world feasibility of meal-timing strategies [107,108]. De Rijk et al. demonstrated that the timing of macronutrient intake during night shifts significantly affects alertness levels, with carbohydrate consumption showing optimal effects when consumed 2–4 h into the shift rather than at shift onset [107]. Similarly, Flanagan et al. documented systematic redistribution of energy intake among rotational shift nurses, revealing that night-shift workers naturally adapt their eating patterns by concentrating caloric consumption during nighttime hours [108]. These adaptive dietary behaviors suggest that structured meal-timing interventions can be successfully implemented in real-world shift work environments. The evidence indicates that both the timing and macronutrient composition of meals during night shifts can be strategically optimized to enhance alertness and support circadian adaptation [107,108], while large cohort studies among flight personnel link late dinners and prolonged eating windows with increased risk of anxiety and depressive symptoms [21].

In addition to meal timing modifications, dietary enrichment with micronutrients essential for energy metabolism and oxygen transport, such as B vitamins, vitamin C, iron, magnesium, and zinc, also plays crucial role [109]. Supplementation with B-complex vitamins (particularly B1, B6, and B12) has been shown to enhance subjective energy levels [110], whereas iron deficiency even without anemia has been linked to fatigue and impaired performance [109].

In parallel, the unique sensory environment of the aircraft cabin influences food perception and requires specific dietary adaptations. Low pressure and humidity reduce taste and smell perception, necessitating food-product reformulation and multisensory design solutions. To offset the health risks associated with such sodium enrichment, potassium-based salt substitutes, gradual sodium-reduction programs, and routine blood-pressure monitoring are recommended [42,43,44]. Techniques such as umami enhancement, the addition of aromatic compounds, and virtual-reality-based acceptance testing have demonstrated effectiveness in maintaining palatability. Cabin humidity control at 40–60% further supports gustatory and olfactory function [39,40,111].

Pre-flight dietary counseling also addresses cabin-pressure-related gastrointestinal symptoms, recommending the avoidance of legumes and carbonated drinks, consumption of balanced meals 2–4 h before flight, and compliance with low-FODMAP principles [69,70].

Environmental and engineering controls aim to minimize cabin air contamination, optimize air quality, and reduce occupational strain through technological and procedural innovation. To achieve these goals, standardized clinical and operational protocols have been established to investigate and manage aircrew exposure to contaminated cabin air events, including structured symptom assessment and biomonitoring where available [48]. Engineering interventions encompass upgraded ventilation and air conditioning (HVAC) filtration systems and continuous monitoring of carbon monoxide (CO) and volatile organic compounds (VOCs) in air supply channels [49]. Source control measures entail restricting high-emission cleaning agents and selecting low-VOC cabin materials based on source apportionment studies [47].

In parallel, ongoing technological upgrades such as real-time CO and VOC sensor systems in ventilation ducts and ergonomic improvements to galley design are being implemented to minimize environmental strain and improve crew comfort [112,113]. These initiatives are increasingly complemented by mindfulness-based stress-reduction programs for cabin crew [7].

Systematic review highlight humidity and temperature management, advanced filtration, and infection-control protocols as integral elements of occupational health protection [112].

Comprehensive occupational health surveillance is essential for protecting reproductive and endocrine function in aircrew. Recommended monitoring procedures include baseline and periodic thyroid function testing (TSH, free T4, antibodies), ovarian reserve assessment (AMH, FSH) for female crew over 30 or with fertility concerns, and specialized reproductive counseling addressing occupational exposure risks [63,64,65].

As circadian misalignment contributes to endocrine and reproductive dysfunction, optimization of circadian health-through schedule control, limitation of consecutive night duties, light therapy, and supervised melatonin supplementation-can mitigate chronobiological disruption [66,93].

Complementary environmental and ergonomic interventions, including enhanced cabin air filtration systems, ergonomic workplace adjustments, and modified duty assignments during preconception and pregnancy, provide additional layers of physical protection [61,114]. Close coordination with reproductive endocrinologists and sleep medicine specialists ensures an integrated approach to managing the unique occupational exposure profile of aviation personnel [63,66].

Preventive strategies further encompass the installation of UV-shielding cockpit windows, routine use of sunscreen, and expanded cancer-screening protocols for high-exposure groups [52,54,55].

Finally, monitoring of DNA-repair biomarkers and implementation of targeted dietary interventions aimed at enhancing antioxidant defense mechanisms have been proposed as potential strategies to reduce molecular damage from chronic radiation exposure [56,58,83].

Comprehensive gastrointestinal health management in aviation combines organizational measures, dietary planning, and microbiome-targeted interventions. Optimizing duty schedules to minimize night-shift frequency, maintaining circadian stability, and implementing structured timed light exposure protocols can reduce the risk of digestive disturbances [67,72].

Dietary strategies should encompass time-restricted eating patterns, fiber-rich meals, attention to hydration and meal timing, while also prioritizing lower-gas-producing foods during flights to minimize pressure-related gastric distension [68,69].

Human randomized controlled trials indicate that Bifidobacterium supplementation may beneficially modulate gut microbial balance and improve psychological well-being under stress or irregular schedules, although direct evidence in occupational shift-work populations remains preliminary [115,116].

Evidence-based probiotic protocols often include Bifidobacterium longum JBLC-141 in combination with prebiotics such as inulin or fructooligosaccharides (FOSs) and fermented foods such as kefir or kimchi [67,70]. Enhanced cabin air quality management, regular health surveillance including gastrointestinal symptom screening, and referral to gastroenterology specialists for persistent symptoms provide additional clinical support [73]. Routine gastrointestinal monitoring using validated tools such as the Rome IV criteria, combined with quarterly microbiome profiling, may further enhance early detection and individualized management of digestive disorders in aircrew [68,72].

Research priorities include prospective aviation-specific cohort studies with validated symptom instruments, longitudinal microbiome sampling, and randomized trials of schedule interventions, targeted probiotics, and meal timing protocols to establish evidence-based prevention strategies [67,70,73].

Addressing the heightened cardiometabolic risk observed among aviation personnel requires an integrated approach that combines clinical surveillance, workload optimization, and targeted lifestyle interventions.

In high-risk aircrew, coronary computed tomography angiography (CCTA) is recommended form the age of 40 to facilitate early detection of subclinical coronary artery disease and to guide certification decisions [117]. Structured lifestyle programs integrating exercise, dietary counseling, and weight control have demonstrated substantial benefits in enhancing cardiorespiratory fitness and reducing blood pressure [83].

To counteract circadian disruption and metabolic dysfunction related to night and rotating shifts, optimized duty scheduling, fatigue-risk management systems, and chronobiological interventions such as strategic napping and circadian lighting are progressively implemented [79,80,81]. These strategies enhance sleep quality, metabolic stability, and operational performance.

Given the rising prevalence of obesity and diabetes among aircrew, comprehensive weight-management programs that integrate nutritional counseling, supervised physical activity, and, where indicated, pharmacological support can effectively improve body composition and glycemic control [76,111]. Occupational stress further intensifies cardiometabolic risk through neuroendocrine activation and behavioral pathways; therefore, workload modification, wellness initiatives, and ergonomic improvements are essential to reduce its impact [61,114].

Collectively, these multidimensional strategies illustrate the necessity of aligning individualized clinical care with organizational-level interventions to safeguard both cardiovascular health and operational safety in aviation professionals.