GCP Learn

The Complete Guide to Hydration

03 Aug

A practical guide to fluid balance, everyday hydration, Singapore routines and choosing when a real-fruit electrolyte drink may help

Publication

PUB-ART-001

Published by

GCP Learn

Audience

Adults, parents, working adults and older readers

Reading time

Approximately 18–22 minutes

Introduction

Hydration is often reduced to a bottle, a daily number or a rule about eight glasses. A more useful starting point is balance. Your body continually gains water, distributes it and loses it. Drinking is one part of that larger system, and the goal is not simply to consume as much water as possible.

This guide explains what hydration means, why water matters, how thirst and the kidneys help regulate fluid balance, and why needs change from one person or situation to another. It also separates three contexts that are often mixed together: ordinary daily hydration, substantial sweat loss during activity, and medical rehydration.

Who this guide is for

This is general education for adults, parents, working adults, older readers and recreationally active adults in Singapore. It does not provide a personal drinking target, diagnose dehydration, replace a prescribed fluid plan, or explain treatment for illness.

Five key takeaways

  1. Hydration is a regulated balance, not a competition to drink more.
  2. Fluid needs vary with the person, the environment, food and drink, activity and health.
  3. Total water comes from plain water, other drinks and moisture-rich foods.
  4. Plain water is often suitable for routine daily life; electrolytes become more relevant only in some contexts.
  5. Thirst, urine colour and individual symptoms provide context, but no single sign diagnoses hydration status.

Quick navigation

What hydration means • Why water matters • How water moves through the body • Thirst and kidneys • Plain water and electrolytes • Singapore routines • Work and exercise • Practical habits • Safety • GCP hydration in practice • FAQs

 

A familiar Singapore/ Malaysian day

Consider one person across two different days. On the first, most hours are spent indoors, with drinks available at meals and at a desk. On the second, the same person commutes in warm weather, spends time outdoors and exercises later. The person has not changed, but the situation has. Heat and physical activity can increase fluid loss through sweating, and sweat loss varies considerably.

1. What hydration means

Hydration means having enough water available for the body to carry out its normal functions. Fluid balance is the ongoing relationship between water gained, distributed and lost. It is dynamic rather than fixed: the body responds as conditions change.

This is an example of homeostasis, the body’s ongoing regulation of important internal conditions within workable ranges. The useful mental model is not a tank that must always be completely full. It is a balance that is continually adjusted.

2. Why the body needs water

Water is essential for normal body function. It is part of the environment in which normal physiological processes take place. That foundation matters more than any dramatic promise: water supports normal function, but it should not be presented as a cure or as proof that drinking extra water will prevent disease.

3. How water enters, moves through and leaves the body

Water enters through drinks and through moisture in food. After it is taken in, it becomes available to the body’s fluid system and tissues. The kidneys then help regulate how much water is retained and how much is excreted. This high-level journey is useful, but it should not be mistaken for disease guidance or a complete account of intestinal, cellular or hormonal mechanisms.

Water in and water out

Water comes in through drinking water, other beverages and moisture-rich foods. It leaves through several normal routes, including urine, sweat, breathing and stool. The balance between gains and losses changes over time, so intake should be understood in context rather than as an isolated daily score.

4. How thirst and the kidneys help regulate fluid balance

The kidneys help regulate how much water the body retains or excretes. They are not simply passive filters, and this general explanation is not intended as advice for kidney disease. People with kidney disease or a prescribed fluid plan should follow their healthcare professional’s guidance.

Thirst is a useful signal for many healthy adults. It is one part of regulation, not a perfect measurement. Its usefulness can be lower in some older adults, children and special situations. Thirst on one occasion also cannot diagnose dehydration or identify why someone feels unwell.

Assessment boundary  Thirst, urine colour and other signs can provide context but cannot diagnose hydration status or identify the cause of persistent symptoms.

5. Why fluid needs differ

There is no single personal amount that fits everyone in every situation. Fluid needs can differ with activity, climate, diet, body and health. They can also change for the same person from one day to another.

Population water-intake recommendations are reference values, not personal prescriptions. They are created for defined populations and may include water from food as well as beverages. They should not be copied into a rigid personal target without understanding the definition and context.

The familiar eight-glasses rule is therefore not a universal scientific requirement. It may still be a practical reminder for some people, but it should not be treated as the correct number for everyone.

6. What counts towards total water intake

Total water intake includes plain water, other beverages and moisture-rich foods. Fruit, vegetables, soups and other foods can therefore contribute water. This does not mean every drink or food is nutritionally identical. Sugar, energy, caffeine and the wider dietary pattern may still matter when choosing what to consume.

Moderate tea and coffee consumption can also contribute to daily fluid intake. Personal caffeine tolerance, sleep and added sugar still matter. The accurate correction is not that coffee is identical to water in every respect, but that it is wrong to say it never contributes fluid.

7. Plain water and electrolyte context

For many healthy people during routine daily life, plain water is often suitable. Meals and ordinary drinks also supply water, and many people obtain electrolytes through everyday foods and beverages. An ordinary indoor day does not automatically create a need for an electrolyte drink.

Five electrolytes in foundation-level context

Electrolytes are minerals that carry an electrical charge when dissolved in body fluids. They contribute to fluid regulation, nerve signalling, muscle function and other normal processes. Their roles are related, but they are not interchangeable, and hydration is not simply a matter of adding more minerals.

Electrolyte

Foundation-level role

Hydration context

Sodium

A major ion outside cells, involved in fluid regulation, nerve signalling and muscle function.

Especially relevant when substantial sweating causes salt loss, but this guide gives no universal sodium target.

Potassium

A major ion inside cells, involved in cellular, nerve and muscle function.

Usually obtained through everyday foods; it should not be presented as necessary in every hydration drink.

Chloride

A major negatively charged ion involved in fluid and acid-base regulation.

Often accompanies sodium and belongs in the fluid-balance discussion, without implying a routine drink requirement.

Magnesium

A mineral involved in many enzyme, nerve and muscle processes.

It is an electrolyte, but the controlled sources do not support presenting it as automatically necessary for everyday hydration or recovery.

Calcium

A mineral with structural and signalling roles, including bone, nerve and muscle functions.

It is an electrolyte, but it is not primarily framed here as a routine sweat-replacement mineral.

 

Electrolytes are minerals that carry an electrical charge when dissolved in body fluids. They contribute to fluid regulation, nerve signalling, muscle function and other normal processes.

From fluid intake to cell-level water balance

Cells keep different concentrations of sodium and potassium on either side of their membranes: sodium is concentrated mainly outside cells, while potassium is concentrated mainly inside cells. Water itself moves across cell membranes mainly in response to differences in the effective concentration of dissolved particles, a process described as osmosis.

A membrane mechanism called the sodium-potassium pump helps maintain these ion gradients. It uses cellular energy, in the form of ATP, to move three sodium ions out of the cell and two potassium ions into it. These gradients support normal cell volume, electrical activity, nerve signalling and muscle function. The pump should not be described as the place where water is exchanged, because water movement and active ion transport are related but distinct processes.

When the body loses water, extracellular fluid may become more concentrated. Water may then move out of cells by osmosis, reducing cell volume until the body restores balance through thirst, kidney regulation and other control systems. This is a foundation-level explanation, not a diagnosis of cellular dehydration from thirst, urine colour or any single symptom.

What this does not mean  Ordinary inadequate drinking should not be described as simply switching off the sodium-potassium pump. Drinking sodium or potassium also does not directly activate or recharge it. More water or more electrolytes are not automatically better.

What this means for hydration and electrolyte intake

The connection begins with intake, but it does not end there. Water and electrolytes from drinks and food are absorbed into the body’s regulated fluid system. They first contribute to the fluid outside cells, including blood and the fluid surrounding cells. The kidneys, thirst response and other control systems then help retain or remove water and electrolytes so that the environment around cells remains within a workable range.

This is why hydration intake matters at cell level without acting directly on the sodium-potassium pump. Drinking supplies water to the wider fluid system, while dietary electrolytes help maintain the body’s available ion stores. The body then regulates extracellular sodium, intracellular potassium and water movement across cell membranes. An electrolyte drink does not send sodium straight outside a cell, potassium straight inside it or switch on the pump; those gradients are actively maintained by normal physiology.

For an ordinary day with modest losses and regular meals, plain water is often suitable and food commonly supplies electrolytes. After substantial or prolonged sweating, replacing fluid remains central, while sodium and chloride replacement may become more relevant because sweat contains water and electrolytes. Potassium remains important to normal cellular function, but this does not mean every drink needs added potassium, calcium or magnesium. The appropriate choice depends on the size and cause of the losses, the person’s diet and health, and whether the situation is everyday hydration, exercise recovery or medical rehydration.

The context changes as losses become larger. Longer or more demanding activity, heavy sweating and individual sweat loss can make electrolyte replacement more relevant. This still does not create one universal formula, dose or product choice, because activity, sweat loss, diet and health differ.

Three people, three different hydration contexts

The cell-level mechanism is shared by everyone: the body regulates water and ions around cells, water can move across cell membranes by osmosis, and the sodium-potassium pump maintains sodium and potassium gradients. What differs is the amount and type of fluid lost, what is being replaced through food and drinks, and whether health conditions change the safe response.

 

Profile 1: Mei, an office worker on a mostly indoor day

Mei travels to work, spends most of the day in air-conditioning and eats regular meals. She loses water through ordinary processes such as urine, breathing and a modest amount of sweating, but she is not experiencing prolonged heavy sweat loss. Water from her drinks and food is absorbed into the body’s regulated fluid system. Her kidneys and thirst response help adjust how much water and sodium are retained or removed, while her usual meals contribute sodium, potassium and other electrolytes.

At cell level, this regulated extracellular fluid provides the environment in which water movement and sodium-potassium gradients are maintained. Mei does not need to drink sodium and potassium to send them directly to opposite sides of each cell membrane. For this ordinary context, accessible plain water and regular meals are often suitable; an electrolyte drink is not automatically required merely because cellular pumps use sodium and potassium.

Profile 2: Arjun, working or exercising outdoors in Singapore heat

Arjun spends a long, active period outdoors and sweats substantially. His immediate loss is not water alone: sweat also contains electrolytes, especially sodium and chloride. If water loss makes the fluid outside his cells more concentrated, water may move out of cells until body-control systems and replacement restore balance. The sodium-potassium pump still maintains the ion gradient; the issue is not that sweating has switched the pump off, but that the wider fluid environment around cells is being challenged by larger losses.

Replacing fluid is central. Because Arjun’s sweat and salt losses are more substantial than Mei’s, sodium and chloride replacement may also become relevant. That does not establish one formula or dose, and it does not mean that added potassium, calcium and magnesium are always necessary. Duration, sweat loss, meals, health and recovery context all matter. Severe or concerning heat-related symptoms require urgent action rather than further self-experimentation with drinks.

Profile 3: Mr Lim, an older adult on a quiet day

Mr Lim is less active and may not notice or act on thirst as promptly as a younger adult. A gradual shortfall in fluid intake can still change the concentration and volume of extracellular fluid, which can affect water movement between that fluid and cells. The cellular principle is the same as in the other profiles, but thirst or one observation such as urine colour cannot diagnose his hydration status by itself.

A practical response may be regular access to drinks and drinking opportunities across the day, together with normal meals, if he has no clinical restriction. But age alone does not prove that he needs an electrolyte drink. If he has kidney or heart disease, takes medicines that affect fluid or electrolyte balance, has been told to restrict fluid or salt, or becomes unwell, general hydration advice is not enough. His appropriate plan should follow professional guidance rather than a generic instruction to drink more water or electrolytes.

The comparison is the practical point: all three people depend on regulated body fluids, osmosis and sodium-potassium gradients, but only Arjun’s example includes substantial sweat and salt loss. The pump explains why controlled water and ion balance matters to cells; the person’s losses and medical context determine whether plain water, food-based replacement, an electrolyte-containing option or professional care is the more relevant next consideration.

Keep everyday, substantial-sweat and medical contexts separate

Context

General education

Routine daily living

Plain water is often suitable, with food and other drinks contributing to total water and electrolytes.

Substantial sweat loss

Fluid and salt losses may make electrolyte replacement more relevant; individual context matters.

Illness or medical rehydration

General sports or everyday guidance is not enough. Medical assessment and appropriate professional guidance may be needed.

8. Planning hydration in Singapore

Singapore's warm and humid climate can increase the importance of planning hydration. Heat and physical activity can increase sweating, but humidity by itself does not prove that everyone needs electrolyte drinks. What matters is the actual day: time outdoors, activity, access to drinks, breaks, meals, sweat loss and personal health context.

A practical planning pattern

  1. Before a warm or active period, check whether drinks and refill points will be available.
  2. During the day, keep an ordinary drink accessible instead of relying on one large catch-up session.
  3. Around outdoor activity, plan opportunities for breaks and drinking.
  4. After substantial sweating, recognise that the context may differ from a routine indoor day.
  5. If concerning symptoms occur in heat, stop relying on general hydration advice and seek urgent help.

9. Working-day and exercise examples

Office or shift-work day

For an ordinary indoor workday, the main challenge may be access and habit rather than unusually high loss. Useful prompts can be linked to the commute, the start of work, meals or breaks. These are opportunities, not prescribed volumes. Tea, coffee, food and water may all contribute, while plain water remains a simple routine choice.

Recreational exercise or a sweaty outdoor session

Physical activity and heat can increase sweat loss, and sweat rates vary considerably. Plain water may still be suitable in many ordinary situations, while substantial fluid and salt loss can make electrolytes more relevant. This guide does not set exercise duration cut-offs, fluid volumes or sodium targets because the controlled sources do not support a universal personal prescription.

10. Common hydration misconceptions

Myth: everyone needs exactly eight glasses

Reality: needs vary, and total water includes food and different drinks. Eight glasses can be a personal reminder, but it is not a universal scientific requirement.

Myth: only plain water counts

Reality: food, tea, coffee and other beverages can contribute water. Their nutritional qualities still differ, so counting as fluid does not make every option equivalent.

Myth: clear urine proves perfect hydration

Reality: urine colour is only one rough clue. Food, vitamins, medicines, timing and recent drinking can affect it. Clear urine does not always indicate ideal hydration, and colour alone cannot diagnose hydration status.

Myth: everyone in Singapore needs electrolytes daily

Reality: climate can change fluid-loss context, but electrolyte relevance depends on actual losses, activity, diet and health. Humidity does not create an automatic requirement.

Myth: more water is always better

Reality: hydration is about balance, and excessive water intake can be harmful. This guide does not provide a dangerous maximum, threshold experiment, diagnosis or home treatment.

Myth: feeling thirsty means dangerous dehydration

Reality: thirst is a normal and useful regulatory signal for many healthy adults. Its usefulness varies, and thirst on its own is not a diagnosis.

11. Practical everyday actions

  1. Make drinks easy to access during the parts of the day when you are most likely to forget.
  2. Use regular routines such as meals, work breaks or a commute as prompts rather than chasing one universal number.
  3. Remember that water can come from food and different drinks, while still considering their nutritional qualities.
  4. Plan ahead when a day includes heat, outdoor time or physical activity.
  5. Treat routine hydration, substantial sweat loss and illness as different contexts.
  6. Use thirst and urine colour as context, not as stand-alone diagnostic tests.
  7. Do not override a prescribed fluid plan with general internet guidance.

12. When general hydration education is no longer sufficient

Urgent symptoms  Confusion, fainting, seizures or severe symptoms can require urgent medical help. Do not rely on general hydration guidance.

If confusion, fainting or severe symptoms occur in heat, stop the activity, move to a safer environment if possible and seek urgent medical help.

Repeated vomiting, persistent diarrhoea, inability to keep fluids down, or significant fluid loss in a young child or frail older adult needs timely medical assessment. Ordinary sports or electrolyte drinks should not be treated as a substitute for medical rehydration guidance.

Persistent excessive thirst, frequent urination, blood or persistent unusual urine colour, or symptoms alongside urinary changes cannot be assessed through general hydration guidance. Arrange an appropriate medical assessment.

General hydration advice may not apply when kidney disease, heart failure, diabetes, a medicine affecting fluids or electrolytes, pregnancy-specific medical advice, infancy or a prescribed fluid restriction is involved. Follow the advice of the healthcare professional managing the situation.

Very large water intake over a short period can be dangerous, especially with confusion, severe headache, nausea or seizures. Seek urgent medical help.

13. Canonical FAQs

How much water should I drink every day?

There is no single amount that suits everyone. Needs vary, total water includes food and drinks, and population references are not personal prescriptions.

Does coffee or tea count?

Yes. Moderate tea and coffee contribute fluid. Caffeine tolerance, sleep and added sugar still matter.

Do fruits and vegetables help?

Yes. Moisture-rich foods contribute to total water intake.

What are electrolytes?

They are charged minerals involved in normal fluid, nerve and muscle physiology. They are not the same thing as hydration.

Do I need electrolyte drinks every day?

Usually not for routine daily living. Meals provide electrolytes for many people, and plain water is often suitable. Substantial losses can change the context.

Is plain water enough?

For many healthy people in routine daily life, plain water is often suitable. Prolonged heavy sweating or medical illness requires a different assessment.

Can I drink too much water?

Yes. Excessive water intake can be harmful. This answer does not provide thresholds, diagnosis or treatment.

Does clear urine prove I am hydrated?

No. Urine colour is only one clue and cannot diagnose hydration status by itself.

Why am I still thirsty after drinking?

Occasional thirst may reflect ordinary context. Persistent or unusual thirst, especially with other symptoms, requires medical assessment.

Does Singapore weather change the context?

Warm, humid conditions and activity can make planning more important, but humidity alone does not mean everyone needs electrolytes.

Are sports drinks the same as ORS?

No. Oral rehydration solution is designed for specific medical rehydration contexts and is not the same as an ordinary sports or electrolyte drink. Follow professional guidance when illness causes significant fluid loss.

14. Continue learning

Use the ideas in this guide to explore practical questions such as why fluid needs differ, whether tea and coffee count, when electrolytes may be useful, and how to plan for a warm or active Singapore day.

  • Learn what electrolytes are and how they contribute to fluid balance
  • Explore common hydration questions and misconceptions
  • Build a simple hydration routine around meals, work breaks, travel and activity
  • Review the five key takeaways at the beginning of this guide

GCP Hydration in Practice: Supporting Fluid Balance and Normal Cellular Function

Every cell depends on a carefully regulated balance of water and electrolytes. Sodium is found mainly in the fluid outside cells, while potassium is concentrated mainly inside them. A cellular mechanism called the sodium-potassium pump helps maintain this difference across the cell membrane. Water moves separately, mainly by osmosis, in response to differences in the concentration of dissolved substances. Together, these processes help preserve the conditions needed for normal cell volume, nerve signalling and muscle function. [CIT-001, CIT-007, CIT-026]

GCP supports this system at the point where hydration begins: what you drink. Prepared according to its approved dilution instructions, GCP contributes fluid together with the electrolytes declared on its nutrition label. After absorption, the body regulates these inputs through the digestive system, circulation, kidneys, hormones and cell membranes. This helps maintain the wider fluid-and-electrolyte environment in which cells preserve their normal sodium and potassium gradients. [CIT-001, CIT-007]

In simple terms, GCP supplies water and label-declared electrolytes as useful inputs, while your body manages their absorption, distribution, retention and excretion. This makes GCP a practical way to support fluid and electrolyte intake as part of the body's normal hydration process.

Real-fruit hydration with botanical character

GCP combines NFC lemon juice with ginger, turmeric and lemongrass. NFC means not from concentrate: the lemon juice has not first been concentrated and then reconstituted with water. Lemon gives the drink a fresh citrus character, ginger adds warmth and gentle spice, turmeric contributes an earthy note, and lemongrass provides a light aromatic finish.

These fruit and botanical ingredients give GCP a recognisable real-food taste and aroma. They also naturally contain plant compounds, although the amounts that remain in the finished drink depend on the formulation, processing, storage and dilution. The prepared drink's fluid and verified electrolyte content provide its direct connection to fluid balance. The fruit and botanicals add recognisable real-food flavour, aroma and naturally occurring plant compounds, creating a more distinctive drinking experience than plain water alone.

The botanical blend offers a practical advantage: it gives people an enjoyable alternative when plain water feels repetitive. A drink that is pleasant, convenient and easy to prepare can fit more naturally into different routines. GCP combines that drinking experience with electrolyte intake in one concentrate.

Mei: hydration variety during a busy working day

Mei spends most of her day in an air-conditioned office. She is not losing large amounts of salt through heavy sweating, so plain water and regular meals may already support her everyday hydration needs. Her everyday needs may often be met by plain water and meals, while GCP gives her a convenient way to add flavour, variety and label-declared electrolytes to her routine.

GCP can still be useful to Mei as a convenient and flavourful hydration option. Its NFC lemon, ginger, turmeric and lemongrass profile gives her a refreshing alternative to plain water, while the concentrate format makes it easy to prepare at work or take through a busy day. Its label-declared electrolytes contribute to her overall dietary intake. For Mei, the benefit is hydration variety, convenience and a distinctive real-fruit drinking experience.

Arjun: replacing losses after substantial sweating

Arjun exercises or works outdoors in Singapore's heat and humidity. When he sweats substantially, he loses water together with electrolytes, particularly sodium and chloride. The amount varies between people, activities and conditions, so replacement needs are not identical for everyone. [CIT-005, CIT-018, CIT-019]

This is the situation in which GCP's combination of fluid and electrolytes may be especially relevant. Prepared according to its approved instructions, it can help Arjun replace fluid together with its label-declared electrolytes after substantial sweating. Sodium-containing drinks may contribute to short-term rehydration and fluid retention after meaningful exercise-related losses, as part of a wider recovery plan that also includes food, rest and access to water. [CIT-001, CIT-005]

GCP supplies fluid and electrolytes that Arjun's body can absorb and regulate as it restores wider fluid balance after meaningful sweat loss. The bright citrus and botanical profile also gives him a refreshing and palatable option during recovery.

Mr Lim: an appealing option with added care

Thirst and drinking patterns can change with age, and some older adults may find regular hydration more challenging. [CIT-012, CIT-013] For Mr Lim, GCP offers a convenient drink with a distinctive real-fruit taste when plain water feels less appealing. Its NFC lemon and aromatic botanicals provide flavour and variety, while its verified electrolytes contribute to his overall intake.

For an otherwise healthy older adult, this can be a simple way to add hydration variety. Individual suitability still matters. Anyone with kidney or heart conditions, diabetes, medicines that affect fluid or electrolytes, or a prescribed fluid, sodium or potassium limit should follow the advice of the healthcare professional managing their care.

One drink, three practical benefits

  • For Mei, GCP offers convenient, flavourful hydration variety during an ordinary working day.
  • For Arjun, GCP provides fluid and label-declared electrolytes that can help replace part of what is lost through substantial sweating.
  • For Mr Lim, GCP offers an appealing real-fruit drinking option that may make regular fluid intake easier, subject to individual medical suitability.

Across all three situations, GCP supports hydration at the intake stage. Its fluid and verified electrolytes have the closest relationship with fluid balance, while NFC lemon, ginger, turmeric and lemongrass provide real-fruit taste, aroma and botanical character. The body then performs the complex work of absorption and regulation that maintains the environment around cells.

GCP is therefore best understood as a convenient real-fruit electrolyte drink that can complement different hydration routines. By supplying prepared fluid and label-declared electrolytes, it supports the wider conditions in which the body maintains normal fluid balance and sodium-potassium gradients.

Explore GCP Hydration

Discover how GCP brings together NFC lemon juice, ginger, turmeric and lemongrass with electrolytes in a convenient drink concentrate. Review the ingredients, nutrition information and preparation instructions, then choose the serving that best fits your day and activity.

Explore GCP Hydration

Learn when electrolytes may be useful

Transparency note: GCP Learn is published by GCP, which also develops hydration products.

References:

  1. CIT-001. Institute of Medicine. Dietary Reference Intakes for Water, Potassium, Sodium, Chloride, and Sulfate. 2005. doi:10.17226/10925.
  2. CIT-002. EFSA Panel on Dietetic Products, Nutrition, and Allergies. Scientific Opinion on Dietary Reference Values for Water. 2010. doi:10.2903/j.efsa.2010.1459.
  3. CIT-005. Sawka MN, Burke LM, Eichner ER, et al. Exercise and Fluid Replacement. 2007. PMID 17277604.
  4. CIT-007. Jéquier E, Constant F. Water as an Essential Nutrient: The Physiological Basis of Hydration. 2010. doi:10.1038/ejcn.2009.111.
  5. CIT-008. Armstrong LE, Johnson EC. Water Intake, Water Balance, and the Elusive Daily Water Requirement. 2018. doi:10.3390/nu10121928.
  6. CIT-010. Armstrong LE, Maresh CM, Castellani JW, et al. Urinary Indices of Hydration Status. 1994. PMID 7868469.
  7. CIT-011. Kavouras SA. Assessing Hydration Status. 2002. doi:10.1097/00042752-200208000-00009.
  8. CIT-012. Kenney WL, Chiu P. Influence of Age on Thirst and Fluid Intake. 2001. PMID 11445740.
  9. CIT-013. Hooper L, Bunn DK, Downing A, et al. Which Frail Older People Are Dehydrated? 2016. doi:10.1093/gerona/glw076.
  10. CIT-014. Hew-Butler T, Rosner MH, Fowkes-Godek S, et al. Third International Exercise-Associated Hyponatremia Consensus Statement. 2015. doi:10.1097/JSM.0000000000000221.
  11. CIT-016. WHO and UNICEF. Oral Rehydration Salts: Production of the New ORS. 2006. WHO/FCH/CAH/06.1.
  12. CIT-017. World Health Organization. The Treatment of Diarrhoea. 2005. ISBN 92-4-159318-0.
  13. CIT-018. Périard JD, Eijsvogels TMH, Daanen HAM. Exercise under Heat Stress. 2021. doi:10.1152/physrev.00038.2020.
  14. CIT-019. Baker LB. Physiology of Sweat Gland Function. 2019. doi:10.1080/23328940.2019.1632145.
  15. CIT-023. Meteorological Service Singapore. Heat Stress and Wet-Bulb Globe Temperature Information.
  16. CIT-024. Health Promotion Board Singapore / HealthHub. Water, Drinks and Healthy Beverage Guidance.
  17. CIT-025. National Academies. Dietary Reference Intakes: Applications in Dietary Assessment. 2000. doi:10.17226/9956.
  18. CIT-026. National Academies of Sciences, Engineering, and Medicine. Dietary Reference Intakes for Sodium and Potassium. 2019. doi:10.17226/25353.
  19. CIT-027. National Institutes of Health, Office of Dietary Supplements. Potassium: Fact Sheet for Health Professionals.
  20. CIT-028. National Institutes of Health, Office of Dietary Supplements. Magnesium: Fact Sheet for Health Professionals.
  21. CIT-029. National Institutes of Health, Office of Dietary Supplements. Calcium: Fact Sheet for Health Professionals.
  22. CIT-030. European Food Safety Authority. Dietary Reference Values for Sodium. 2019. doi:10.2903/j.efsa.2019.5778.
  23. CIT-031. European Food Safety Authority. Dietary Reference Values for Chloride. 2019. doi:10.2903/j.efsa.2019.5779.
  24. CIT-032. European Food Safety Authority. Dietary Reference Values for Potassium. 2016. doi:10.2903/j.efsa.2016.4592.
  25. CIT-033. European Food Safety Authority. Dietary Reference Values for Magnesium. 2015. doi:10.2903/j.efsa.2015.4186.
  26. CIT-034. European Food Safety Authority. Dietary Reference Values for Calcium. 2015. doi:10.2903/j.efsa.2015.4101.
  27. CIT-035. National Academies / Institute of Medicine. Dietary Reference Intakes for Calcium and Vitamin D. 2011. doi:10.17226/13050.
  28. CIT-048. Renal Control of Calcium, Phosphate, and Magnesium Homeostasis.

General education disclaimer

GCP Learn provides general nutrition education and does not diagnose conditions, prescribe treatment or replace professional healthcare advice. General hydration advice may not apply when a health condition, medicine, pregnancy, infancy or a prescribed fluid plan is involved. Seek appropriate medical help for severe, persistent or concerning symptoms.

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