Environmental Factors
Linas JuozėnasShare
Environmental factors
Understand the exposure. Choose useful protection. Keep room for an active, nourished life.
The air we breathe, the water we drink and the conditions around our homes and workplaces influence health. Outdoor life also offers movement, daylight and enjoyment, while ultraviolet radiation requires sensible protection. These influences deserve clear, practical guidance.
This guide focuses on reducing relevant pollution exposures and meeting vitamin D needs while protecting skin. It explains what household measures can achieve, where testing or professional help matters, and why safer buildings, water supplies and public spaces are part of the solution.
Smoke, contaminated well water and strong ultraviolet radiation need different responses.
Source control, suitable ventilation, verified treatment and protective routines each have a role.
Consider activity, nutrition, comfort, cost and access when choosing a manageable next step.
Ask what is present, how exposure occurs and what can change
An environmental concern becomes easier to address when it has a specific description: smoke entering a bedroom, an untested private water source, persistent dampness or outdoor work during strong sun. A broad promise to remove “toxins” does not identify which problem is being solved.
Connect the information with a decision
Ask what you need to know. An air-quality forecast may help choose a route or time. A laboratory water test can identify a contaminant that a treatment system must address. A UV forecast can guide protection for an outdoor activity.
Choose information appropriate to that question. A pleasant smell, a clear appearance or a consumer product's reassuring label is not a complete assessment of safety.
Prioritise changes with a clear purpose
Start with known sources and recurring problems. Repairing faulty equipment, following a water advisory or arranging shade may be more useful than purchasing several products with unclear claims.
Some changes can be made personally; others require a landlord, supplier, employer or public authority. Cost, housing and access affect the available choices. The aim is a workable improvement in conditions, with responsibilities shared by the people and organisations able to help.
Air pollution includes particles and gases
Particulate matter consists of airborne particles with different sizes and compositions. PM2.5 and PM10 are size categories; PM10 includes smaller particles as well as the coarser fraction. Traffic, fuel burning, industry, dust and atmospheric reactions can contribute.
Gases behave differently. Nitrogen dioxide can arise from combustion, while ground-level ozone forms through reactions involving other pollutants and sunlight. Air pollution can affect respiratory and cardiovascular health through both short and longer exposures.[1]
Use local information carefully
The European Air Quality Index combines monitoring and modelled information with health advice.[2] Check the location, timestamp, pollutant and whether a value comes from a station or an estimate. A regional colour does not measure the air at your exact position.
For Lithuania, the Environmental Protection Agency also provides air-quality dashboards and monitoring information. These resources help interpret current conditions; this article does not report today's air quality.
Look beyond visible haze
Pollution can be present without obvious smoke or a strong smell. Conversely, a single unpleasant odour does not quantify every pollutant. Use observations to notice a possible problem, then seek the information needed to understand it.
Change the place, timing or intensity when conditions call for it
WHO's practical guidance supports retaining regular activity while choosing cleaner routes and times.[3] Distance from heavy traffic can help; a green appearance alone does not establish clean air.
During pollution episodes, follow local advice and consider shorter activity or a cleaner setting. Indoors also needs assessment of sources and incoming air.
Build more than one suitable option
For a familiar activity, identify an alternative route, location or day. Consider distance, transport, accessibility, weather and the effort of changing the plan. An alternative that creates an impractical journey may not be repeatable.
Pollution patterns vary with traffic and weather. Use local information; early morning is not always cleanest.
Respond to the person as well as the forecast
Reduce or stop exertion if cough, wheeze or chest tightness develops. Follow an established care plan where relevant; significant or persistent symptoms need medical attention.
Reducing emissions from transport, heating and industry improves the conditions beyond individual route choices.
Reduce sources, ventilate appropriately and filter for a purpose
Begin where pollutants enter or are produced
Cooking, fuel burning, smoking, renovation and some household tasks can add indoor pollutants. Source reduction and extraction that discharges outdoors can be useful. Ventilation can dilute indoor pollution when the incoming air is suitable.[4]
During nearby smoke or an outdoor pollution spike, opening windows may bring more pollution in. At other times, keeping a room continuously closed can leave indoor contaminants and moisture accumulating. Use the building's ventilation appropriately and consider outdoor conditions, heat and indoor activities together.
Understand what filtration can remove
A HEPA filter captures particles passing through it. It does not, by itself, remove pollutant gases. Gas removal needs suitable filter media and evidence for the particular substance. A particle clean-air delivery rate describes particle cleaning, not universal purification.[5]
Match capacity to the room and the operating speed you can tolerate. Placement, actual use, filter replacement and ongoing costs affect performance. Avoid devices intended to generate ozone, and do not rely on a purifier to deal with carbon monoxide or radon.
Keep expectations realistic
Filtration can supplement source control and ventilation. It cannot repair a damp wall, remove the need to maintain a heater or make every exposure disappear.
Ordinary houseplants can be enjoyed for their appearance. A normal number of plants has not been shown to remove meaningful amounts of pollution in real rooms; results from small laboratory chambers do not make them an air-treatment system.[4]
Moisture, combustion and radon need different responses
Persistent dampness and mould
WHO guidance links persistent building dampness and microbial growth with respiratory symptoms, allergies and asthma.[6] Find and address the moisture source, such as a leak or recurring condensation. Repeated growth or damaged materials may require building expertise; masking the smell does not fix the cause.
When requesting help, describe where the problem appears, whether it returns and any apparent leak or damage. Photographs and dates can make a recurring building problem easier to discuss.
Carbon monoxide from combustion
Carbon monoxide, or CO, can be produced by faulty or poorly ventilated fuel-burning equipment. It cannot be reliably detected by smell. Maintain equipment and flues, preserve required ventilation and use an appropriate CO alarm according to its instructions.[7]
If a CO alarm sounds, leave the building and seek emergency help from outside; in Lithuania and across the EU, call 112. Do not stay inside to investigate or wait for symptoms. An air purifier or ordinary smoke detector is not a substitute for CO protection.
Radon in indoor air
Radon is a naturally occurring radioactive gas that can enter buildings from the ground. Long-term exposure increases lung-cancer risk. Indoor measurements are needed to assess an individual building; a regional map cannot provide that result.[8]
Lithuania's Radiation Protection Centre provides information about measurement and reduction. Where a concern is identified, appropriate building measures should address it. Ordinary particle readings cannot tell you the radon concentration.
Start with monitoring information or appropriate testing
Publicly supplied water
Check your supplier's water-quality information and any current advisory. In Lithuania, public suppliers monitor drinking water under State Food and Veterinary Service supervision.[9] If colour, smell or taste changes, contact the supplier; unresolved concerns can be raised with the responsible authority.
A report describes the supply and the measurements made. A particular concern may also involve plumbing or conditions at the property. Explain the issue clearly so that testing or action can address the right location.
Private wells and boreholes
Arrange suitable laboratory testing for the source and local risks. Ask an accredited laboratory or public-health authority which microbiological and chemical tests are appropriate, and when circumstances warrant repeating them. A nitrate result alone does not establish complete water safety.
NVSC guidance notes that nitrate and nitrite contamination cannot be judged by taste, smell or colour.[10] For wells or shallow boreholes used during pregnancy or for an infant's food, check the current Lithuanian testing guidance and support available.
Make the result lead to a decision
Ask which substance or organism was found, what uses are affected and which action is recommended. If a supply is unsuitable, arrange a verified safe alternative while the problem is addressed.
Clear-looking water is not proof of safety, and an unexplained change is not a reason to guess at a treatment. The source, the test and the proposed use need to match.
Boiling, filtration and replacement water are different tools
Boiling can inactivate disease-causing microbes. It does not make harmful chemical contamination safe.[11] Follow the actual notice: a boil-water advisory and a do-not-drink advisory are different instructions.
Boiling does not remove nitrate or nitrite; prolonged boiling can concentrate nitrate as water evaporates.[10] Do not improvise a boiling solution to chemical contamination. Use a safe alternative and follow the responsible authority's guidance.
| Concern | Useful starting point | Important limit |
|---|---|---|
| A microbial boil-water notice | Follow its preparation, storage and permitted-use instructions. | Ordinary filter pitchers may not provide the required disinfection. |
| Known or suspected chemical contamination | Use an approved safe source and obtain specific advice. | Boiling is not a general chemical-removal method. |
| A contaminant confirmed by testing | Choose treatment with verified performance for that contaminant. | A claim to improve taste does not establish removal. |
| An untested private source | Arrange appropriate sampling and testing. | Appearance and a single limited test cannot establish overall safety. |
Match a filter to the water
Filters vary substantially. Some mainly improve taste; others address particular particles, microbes or chemicals. Reverse osmosis can reduce certain dissolved substances, including nitrate in suitable systems, but capability depends on the product and conditions.[12]
Check the specific independently verified performance, required servicing and replacement schedule. Ask how you will confirm that the treated water meets the need. Maintenance and appropriate follow-up testing are part of treatment.
If a monitored supply already meets the relevant requirements, an additional household filter may be unnecessary. Choose it to solve a defined problem rather than assuming every home needs the same system.
Reduce relevant exposure while keeping nourishment practical
Choose fish with the species and person in mind
Large predatory fish can accumulate more mercury over their lives. European advice aims to retain the nutritional benefits of fish while limiting higher-mercury choices.[13] Use variety and follow national guidance for pregnancy, children and locally caught fish. Advice about one species should not be extended automatically to every fish or every tuna product.
Wash produce and vary your choices
Wash fruit and vegetables with clean water and use a clean brush where appropriate. This removes dirt and can reduce some surface residues; it cannot remove every contaminant. Dish soap or special produce cleaners are unnecessary.[14]
Keep fruit and vegetables in an adequate, varied diet. A practical washing routine and reliable food sources are useful starting points without making every shopping decision an expensive search for purity.
Use containers for their intended purpose
Food storage, freezing and reheating are different uses. Follow the container's instructions for temperature, food type and contact time, including any separate directions for the lid. A container suitable for cold storage is not automatically suitable for microwave heating.[15]
Use intact food-contact materials and replace damaged items as appropriate. Glass, metal, ceramic and plastic each have uses and limitations. The relevant question is whether the particular item is suitable for the job.
Bring a specific concern about a food, water source or product to the responsible supplier or authority. A general “detox” claim does not tell you whether that concern has been addressed.
Daylight, heat and ultraviolet radiation are different influences
Light reaching the eyes helps regulate the body's daily timing.[16] That is different from vitamin D production in skin, which depends on UVB exposure. Enjoying a bright outdoor setting does not require deliberately leaving skin unprotected.
UV exposure varies with season, latitude, altitude, time of day, clouds and reflection. It cannot be judged reliably by how warm the air feels.[17] A cool or cloudy day can still call for protection.
Use the UV Index for its intended purpose
The UV Index indicates the strength of sunburn-producing ultraviolet radiation. WHO recommends protection when it reaches 3. Lower values are not a universal promise of no risk, particularly with extended exposure or individual sun sensitivity.
Use the local forecast and consider what the activity involves: time outside, available shade, reflective surfaces and exposed skin. The index is a protection tool, not a calculator for an individual's vitamin D dose.
Keep outdoor life enjoyable
A shaded walk, covered outdoor work or time in a suitable public space can still offer daylight, movement and connection. The practical goal is to make those activities fit the conditions.
Combine shade, clothing and appropriate sunscreen
Plan around the strongest UV, commonly near solar noon, and use shade, covering clothing, a suitable hat and sunglasses with documented UV protection. Shade reduces exposure but does not remove all scattered or reflected UV.[18]
For exposed skin, use broad-spectrum UVA/UVB sunscreen with SPF 30 or higher. Apply generously before exposure according to the label, and reapply about every two hours and after swimming or sweating. Sunscreen does not make extended exposure risk-free.
There is no universal unprotected-sun prescription
Protect skin before exposure: no fixed duration of unprotected midday sun reliably meets everyone's vitamin D needs. Avoid tanning beds.
Make protection available during the activity
For longer outings or outdoor work, arrange access to shade, protective items and breaks throughout the activity.
Protection should fit the person and activity. Individual sun sensitivity may call for additional advice.
Children need age-specific protection and vitamin D guidance.
Support adequacy through the whole pattern of intake
Vitamin D supports calcium and phosphorus handling and normal bone mineralisation. Skin production depends on UVB and varies with latitude, season, pigmentation, age and skin coverage. At northern latitudes, winter sunlight is an unreliable source.[19]
In northern settings such as Lithuania, winter daylight remains valuable even when skin production is limited.
Look at food and supplements together
Oily fish and vitamin-D-fortified foods can contribute. Check labels: dairy products and plant-based alternatives are not all fortified, and amounts differ. A supplement may be useful where intake or skin production is insufficient, according to relevant guidance.
Consider the whole diet and any nutrients already supplied by other products when choosing an approach.
A nutrient's biological role is not a universal treatment claim
Evidence that vitamin D is needed for normal function does not establish that taking extra will improve mood, testosterone, immunity or every chronic condition. Those questions require studies of the particular outcome and population.
Deficiency and its treatment are important clinical matters. They should be distinguished from general advice to keep an already adequate person taking progressively more.
A reference intake and an upper limit answer different questions
EFSA sets an adult adequate intake for vitamin D of 15 micrograms (µg), equivalent to 600 IU, per day, assuming minimal skin production.[19] This is a population reference for total dietary intake, including supplements. It is not automatically the supplement dose every person should take or a treatment for diagnosed deficiency.
EFSA's adult tolerable upper intake level is 100 µg, or 4,000 IU, per day from all dietary sources.[20] This is a safety ceiling for habitual intake, not a recommended target. Excess supplementation can disturb calcium balance.
Read the amount and the schedule
Check how much one tablet, capsule, drop or serving contains and how often it is intended to be taken. Include any vitamin D already present in another supplement. Product concentrations and dosing schedules can differ substantially.
Ask a pharmacist or qualified clinician when a label, combination or proposed dose is unclear. High-dose treatment for a clinical problem belongs within an individual plan; do not copy another person's regimen.
Plan around a defined need
Consider diet, limited skin production, existing conditions and current guidance for the relevant group. A sustainable plan should have a reason for the amount selected and for any follow-up, rather than treating the highest available strength as the best choice.
Use research to refine the decision
Regular sunscreen can affect vitamin D status
In the 2025 Sun-D randomised trial, routine SPF50+ use produced a smaller increase in average blood 25-hydroxyvitamin D than discretionary sunscreen use over about a year.[21] The between-group difference was about 5 nmol/L. The trial did not show that sunscreen lowered everyone's level or establish a fracture outcome.
Keep UV protection and address vitamin D adequacy through diet and appropriate supplementation; testing needs clinical context.
Extra supplementation does not guarantee a better outcome
In a large trial of midlife and older adults not selected for vitamin D deficiency, low bone mass or osteoporosis, 2,000 IU of vitamin D3 daily did not significantly reduce fractures compared with placebo.[22] That result does not describe treatment of diagnosed deficiency.
Test when the result answers a clinical question
The usual status test measures blood 25-hydroxyvitamin D, often written 25(OH)D. The Endocrine Society's 2024 guideline suggests against routine screening of otherwise healthy adults without an established indication.[23]
Testing may be appropriate for a specific clinical concern. Ask what question the test will answer and how the result would change care. A laboratory number should be interpreted in context; a universal “optimal” target for preventing every disease has not been established.
Persistent symptoms deserve assessment on their own merits. Fatigue or feeling unwell should not automatically be attributed to vitamin D, pollution or another single environmental explanation.
Build a plan that fits the place and the person
Conditions can interact. Closing a window may reduce smoke entry while making a room hotter. A quieter sleeping room still needs appropriate ventilation. Consider the whole setting when choosing a response.
During heat, shift demanding activity to cooler conditions where feasible, arrange shade and fluids, and make a cooler place available.[24] Persistent transport noise can also disturb sleep; practical changes may involve the room, building or surrounding sources.[25]
| Situation | A useful next step | What to check afterwards |
|---|---|---|
| Smoke affects an outdoor activity | Check local advice and choose a more suitable route, time or indoor setting. | Does the alternative improve conditions without adding a different problem? |
| Dampness repeatedly returns | Identify the moisture source and arrange appropriate repair. | Has the cause been addressed, rather than only the visible surface? |
| A private water source is untested | Arrange relevant sampling and a safe supply for any use of concern. | Do the results answer the question and lead to a clear action? |
| Several hours of outdoor work are planned | Arrange shade, clothing, sunscreen and appropriate breaks. | Are protection and recovery actually available throughout the work? |
| Vitamin D intake is uncertain | Review food, fortified products and existing supplements with relevant guidance. | Is there a clear intake plan and a reason for any clinical testing? |
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Name the recurring concern.
Describe the source, setting and people affected.
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Find the information that matters.
Use appropriate monitoring, supplier information, testing or professional assessment.
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Choose a proportionate response.
Address the source or exposure with a measure that fits the problem.
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Make the response practical.
Consider cost, maintenance, accessibility and who needs to help.
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Review whether conditions improved.
Check the relevant result and adjust the plan if the problem continues.
These are planning examples, not a complete building, water or clinical assessment. The best starting point is the change that most directly addresses a known need.
Common questions about exposure and sunlight
Should I stop exercising outdoors whenever air quality is imperfect?
Use local advice and adapt to the conditions and your health. A different route, time, intensity or cleaner indoor setting may preserve a useful activity.
Does a HEPA purifier remove every pollutant?
No. HEPA addresses particles passing through the filter. Gases and building problems require different measures; no purifier replaces source control.
Can houseplants replace ventilation or filtration?
No. Ordinary numbers of houseplants have not been shown to clean real rooms to a meaningful degree. Enjoy them without relying on them as air treatment.
Will boiling make chemically contaminated water safe?
No. Boiling addresses microbes, not chemical contamination. Follow the specific advisory and use a verified safe source when instructed.
Does clear well water mean it is safe to drink?
No. Some contaminants have no distinctive colour, smell or taste. Appropriate testing is needed for the source and intended use.
Should I get unprotected midday sun before applying sunscreen?
No. Plan UV protection before exposure and address vitamin D through adequate intake and appropriate individual guidance.
Can sunscreen affect vitamin D levels?
Yes. A recent high-SPF trial found a difference in blood vitamin D status. Keep sun protection and review adequacy rather than adopting deliberate unprotected exposure.
Does everyone need a vitamin D blood test?
No. Routine screening is not recommended for otherwise healthy adults without an indication. A specific clinical concern can justify assessment.
Is 4,000 IU the recommended daily vitamin D dose?
No. It is EFSA's adult upper intake level, not the intake target. Total intake and any individual treatment plan need to be considered.
What if I cannot change the building or outdoor environment myself?
Document the specific concern and involve the appropriate supplier, property manager, employer or authority. Practical protection and changes to the underlying conditions can proceed together.
Sources behind the guide
The sources distinguish official guidance, monitoring tools, nutrient reference values and clinical trials. A filter's technical capability is different from a demonstrated health outcome; a population recommendation is different from individual treatment.
Sources were checked on 5 September 2026. Live advisories and local measurements may change. The practical examples support informed choices and should be adapted to the specific source, setting and person.
- World Health Organization. Air quality, energy and health: Type of pollutants. Health information; accessed 5 September 2026.Official overview of particles, gases and health effects. Appearance and odour cannot quantify an individual's exposure. Return to text ↑
- European Environment Agency and European Commission. European Air Quality Index. Live monitoring and modelling resource; accessed 5 September 2026.Short-term information combines measurements and estimates. Check location, timestamp and data type; the map does not measure personal exposure. Return to text ↑
- WHO Regional Office for Europe. Personal-level actions to reduce air pollution exposure: Practical advice. Practical guidance, 15 November 2024.Evidence-informed guidance on adapting activity and exposure. Feasibility depends on local conditions; reducing emissions remains essential. Return to text ↑
- United States Environmental Protection Agency. Improving Indoor Air Quality. Technical guidance; updated 3 August 2026.Source control, suitable ventilation and limits of household plants. General principles require adaptation to the building and outdoor conditions. Return to text ↑
- United States Environmental Protection Agency. Guide to Air Cleaners in the Home, 2nd edition. Portable air cleaners, furnace and HVAC filters; page updated 17 February 2026.Technical guidance distinguishes particle and gas filtration, capacity and maintenance. It does not promise that a device removes every pollutant or prevents disease. Return to text ↑
- WHO Regional Office for Europe. WHO guidelines for indoor air quality: dampness and mould. Evidence-based guidelines, 2009.Persistent dampness and microbial growth are associated with respiratory problems. Guidance supports moisture prevention and repair; it does not diagnose an individual's symptoms. Return to text ↑
- Lithuanian Fire and Rescue Department. Nematomas, bet klastingas priešas – smalkės. Carbon monoxide: an invisible hazard; 16 November 2021.Lithuanian prevention and emergency guidance. Equipment maintenance, ventilation and CO alarms have complementary roles; an alarm requires leaving and obtaining help. Return to text ↑
- Lithuanian Radiation Protection Centre. Radono skleidžiama apšvita. Exposure from radon; updated 25 March 2026.Official information on radon, indoor measurement and reduction. Regional risk information cannot establish a particular building's concentration. Return to text ↑
- Lithuanian State Food and Veterinary Service (VMVT). Pasaulinė vandens diena: Lietuvoje geriamojo vandens kokybei keliami aukšti reikalavimai. World Water Day: drinking-water quality in Lithuania; 22 March 2024, updated 27 March 2024.Describes public-supply monitoring and routes for raising concerns. National oversight does not replace current supplier information or investigation of a property-specific problem. Return to text ↑
- National Public Health Centre under Lithuania's Ministry of Health (NVSC). NVSC: kviečiame pasirūpinti šulinių ir gręžinių vandens tyrimais. Arrange testing of well and borehole water; 20 March 2026.Guidance on nitrate and nitrite, testing support for eligible pregnancy and infant households, and boiling limitations. A limited chemical test is not a complete safety assessment. Return to text ↑
- United States Centers for Disease Control and Prevention. Household Water Treatment. Technical public-health guidance, 22 April 2024.Distinguishes microbial disinfection from chemical contamination. Follow the actual local advisory, including restrictions on use and requirements for an alternative supply. Return to text ↑
- United States Centers for Disease Control and Prevention. About Choosing Home Water Filters. Technical public-health guidance, 10 April 2024.Treatment must match a verified contaminant and product capability. Installation, servicing and appropriate testing matter; taste improvement does not establish disinfection or chemical removal. Return to text ↑
- European Food Safety Authority. Fish and seafood consumption in the EU: awareness of dietary advice on mercury. Official survey findings and dietary-advice communication, 12 February 2026.Explains national advice on retaining fish's benefits while limiting mercury exposure. Species and population group matter; this survey is not a clinical outcome trial. Return to text ↑
- German Federal Ministry of Health, gesund.bund.de. Undesirable substances in food. Public-health information, 17 February 2022.Supports varied food choices and washing produce with clean water. Washing can reduce some surface residues, but cannot remove every contaminant. Return to text ↑
- Finnish Food Authority. Consumer resources to affect chemical exposure from food contact materials. Consumer guidance, 31 July 2020.Use food-contact products within their intended conditions. Material, temperature, food type, contact time and condition matter; no single material is universally suitable. Return to text ↑
- Eunice Kennedy Shriver National Institute of Child Health and Human Development. What makes us sleep?. Health information; reviewed 29 April 2019.Explains light's role in circadian timing. Light reaching the eyes and UVB-driven vitamin D production in skin are different processes. Return to text ↑
- World Health Organization. Ultraviolet radiation. Fact sheet, 21 June 2022.Global prevention guidance addresses changing UV conditions and protection at UV Index 3 and above. It provides no universal safe duration of unprotected exposure. Return to text ↑
- World Health Organization. Radiation: Protecting against skin cancer. Questions and answers, 16 July 2024.General guidance combines clothing, shade and sunscreen. Protection does not justify extending exposure. Return to text ↑
- EFSA NDA Panel. Dietary reference values for vitamin D. EFSA Journal 2016;14(10):4547.Population dietary reference assuming minimal skin production; includes supplements. It is not a deficiency-treatment dose. Return to text ↑
- EFSA NDA Panel; Turck D et al. Scientific opinion on the tolerable upper intake level for vitamin D, including the derivation of a conversion factor for calcidiol monohydrate. EFSA Journal 2023;21(8):8145.Scientific risk assessment of habitual total dietary intake. The adult upper level is neither an intake target nor a value to apply to children. Return to text ↑
- Tran V, Duarte Romero BL, Andersen H, et al. Effect of daily sunscreen application on vitamin D: findings from the open-label randomized controlled Sun-D Trial. British Journal of Dermatology 2025;193(6):1128–1137.Australian trial: 639 adults randomised, 628 analysed. Routine SPF50+ was compared with discretionary use. Blood-status findings do not establish fracture effects or Lithuanian deficiency prevalence. Return to text ↑
- LeBoff MS, Chou SH, Ratliff KA, et al. Supplemental Vitamin D and Incident Fractures in Midlife and Older Adults. New England Journal of Medicine 2022;387(4):299–309.Randomised placebo-controlled trial of 25,871 US adults; median follow-up 5.3 years. Participants were not selected for deficiency, low bone mass or osteoporosis. Return to text ↑
- Endocrine Society; Demay MB et al. Vitamin D for the Prevention of Disease. Clinical practice guideline, 3 June 2024; JCEM 2024;109(8):1907–1947.Recommendation 12 addresses otherwise healthy adults without established testing indications. It does not discourage investigation or treatment when clinically justified. Return to text ↑
- World Health Organization. Heatwaves: How to stay cool. Questions and answers, 11 October 2024.Practical public-health advice on reducing heat exposure. Adapt activity and access to cooling to local conditions and the person's needs. Return to text ↑
- European Environment Agency. Environmental noise in Europe 2025. EEA Report 05/2025, 24 June 2025; corrections incorporated 27 March 2026.Assessment based on the 2022 reporting cycle links transport noise with sleep disturbance and other health effects. It does not measure a particular home. Return to text ↑