Hydration, Electrolytes & Acid–Base

Citation model. Claims grounded in AllNutrition's trust-scored library carry an inline bracketed reference [n] linking to the References section, which lists each source's evidence level and AllNutrition trust score (0–1). Where an AllNutrition query returned an overall evidence_strength and consensus_level, those labels are surfaced in the Evidence Review so readers can calibrate confidence. Only sources actually returned by the tool are cited; no trust scores are invented.

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1. Introduction

Water is the only nutrient every organ, every reaction, and every cell membrane depends on continuously, yet it is the nutrient physicians reason about least rigorously. Hydration advice in clinical practice ranges from reflexive ("drink more water") to absent, and popular culture has filled the vacuum with folklore — the "eight glasses a day" rule, the alkaline-diet claim that acidic food dissolves bone, the assumption that coffee dehydrates. Meanwhile the physiology that actually governs fluid and electrolyte balance — osmoreceptors, arginine-vasopressin (AVP), the renin-angiotensin-aldosterone system (RAAS), and renal acid handling — is some of the most precisely characterized machinery in the body, and its failure states (hyponatremia, hyperkalemia, dehydration-associated cognitive decline, exercise-associated hyponatremia) are common, sometimes fatal, and often iatrogenic.

This module builds the physiological foundation — compartments, osmolality, thirst, AVP, RAAS, and acid-base handling — and then applies it to the clinical questions students will actually face: how much fluid is enough, when electrolyte drinks matter and when they are marketing, why older adults are disproportionately vulnerable to dehydration, how exercise-associated hyponatremia kills otherwise healthy athletes, and whether the alkaline-diet hypothesis for bone and kidney health survives scrutiny. It links forward to the hypertension module through the shared RAAS and sodium-potassium physiology, and it models the same evidentiary discipline taught in Module 01: distinguishing mechanism from outcome, and correlation from the causal claims marketed on beverage labels.

2. Learning Objectives

By the end of this module, the learner will be able to:

1. Describe the distribution of total body water across intracellular and extracellular compartments and explain how plasma osmolality, thirst, and AVP/ADH interact to defend water balance.
2. Explain the role of the RAAS in sodium and volume regulation, and describe the "potassium switch" mechanism linking dietary potassium to sodium excretion and blood pressure.
3. Critically evaluate the evidence (or lack thereof) behind the "8 glasses a day" rule and articulate how individualized water requirements are actually determined.
4. Recognize the causes, risk factors, and clinical consequences of dehydration, overhydration, and exercise-associated hyponatremia, including the danger of overly rapid sodium correction.
5. Evaluate the alkaline-diet/dietary-acid-load hypothesis as applied to bone and kidney health, distinguishing established from unsupported claims.
6. Apply fluid, sodium, and potassium targets in practice, including recognition of drug-electrolyte interactions and special considerations in older adults and CKD.

3. Scientific Foundations

3.1 Body water compartments and osmolality

Total body water is partitioned into the intracellular fluid (ICF) and extracellular fluid (ECF, comprising plasma and interstitial fluid), with the ICF holding the larger share of body water in health [1]. This distribution is not static: multi-frequency bioelectrical impedance studies show that acute dehydration is borne disproportionately by the extracellular compartment, while chronic dehydration progressively depletes intracellular water and measurably impairs muscle strength and power — a distinction with direct implications for how "hydration status" should be assessed in athletes and older adults rather than inferred from body mass alone [3].

Plasma osmolality is the physiological variable the body actually defends. When water intake falls, solute concentration in the ECF rises, and this elevation in osmolality is the principal trigger for two parallel responses: the behavioral drive of thirst and the hormonal action of AVP (also called antidiuretic hormone) [1]. AVP is synthesized in the hypothalamus and released in response to rising osmolality, falling plasma volume, or falling blood pressure; its renal action increases water reabsorption via aquaporin-mediated concentration of urine, and it also acts as a direct vasoconstrictor [1]. Because AVP has a very short half-life, copeptin, a stable co-secreted peptide, is used as its clinical and research surrogate [1][5]. Habitually low water intake — thresholds of roughly ≤1.2–2.0 L/day in the general population, or <35 mL/kg/day in athletes — is associated with chronically elevated AVP/copeptin, a state that may impose sustained renal, metabolic, and hormonal strain even when total body water appears grossly normal [2].

3.2 RAAS, the potassium switch, and sodium-potassium integration

The RAAS is the primary hormonal axis coordinating sodium, volume, and blood pressure. Falling sodium delivery to the kidney stimulates renin release (the rate-limiting step); the resulting angiotensin II and aldosterone increase renal sodium reabsorption, and water follows osmotically to expand plasma volume and raise pressure [6]. Critically, RAAS activity is not independent of potassium: a renal distal-tubule mechanism sometimes called the "potassium switch" links dietary potassium directly to sodium handling. Potassium deficiency activates sodium retention via the NCC transporter (conserving potassium at the cost of raising blood pressure), while high dietary potassium promotes natriuresis by inhibiting the same pathway and modulating aldosterone-dependent sodium reabsorption [6]. The clinical upshot is that sodium and potassium must be considered jointly rather than in isolation: a low dietary potassium-to-sodium ratio is associated with sustained RAAS activation and a pro-inflammatory profile (elevated CRP), whereas ratios approaching 1:1 are associated with RAAS suppression and lower systemic inflammation [6][8]. This is also a salt-sensitivity story — in salt-sensitive individuals RAAS may fail to suppress adequately across the day, producing a "non-dipper" nocturnal blood pressure pattern that independently predicts target-organ damage [6][9]. This physiology is the direct bridge to the cardiometabolic/hypertension module: the same RAAS and Na/K mechanisms that govern day-to-day fluid balance are the target of the DASH-pattern and salt-substitution interventions discussed there.

3.3 Dehydration: cognitive, physical, and renal consequences

Mild-to-moderate dehydration principally impairs endurance performance through impaired thermoregulation and raised cardiovascular strain, and it consistently raises rating of perceived exertion (RPE) — a psychobiological effect that reduces voluntary work rate even before objective physical capacity is exhausted [10][11]. Effects on cognition are more heterogeneous: several controlled studies found objective cognitive and reaction-time measures preserved or even paradoxically improved under exercise-associated hyperthermia (attributed to faster nerve conduction velocity), while subjective concentration still declined — underscoring that "dehydration impairs the brain" is a real but more nuanced effect than commonly asserted, concentrated more in perceived effort than in measured cognitive performance [10]. Chronically, low water intake is mechanistically linked to elevated AVP/copeptin, and observational and short intervention data associate higher water intake with lower fasting glucose, triglycerides, and LDL, and improved glucose handling in type 2 diabetes when water is taken before meals — plausible but not yet outcome-proven benefits [2][5].

3.4 Acid-base physiology and dietary acid load

Diets are net acid- or base-forming depending on their nutrient composition. Potential renal acid load (PRAL) and net endogenous acid production (NEAP) are validated indices: animal protein, phosphorus, and sulfur amino acids are acid-forming, while potassium, magnesium, and calcium (concentrated in fruits and vegetables) are base-forming, generating bicarbonate on metabolism [27]. Vegan diets tend to be net-alkaline, vegetarian diets roughly neutral, and Western diets net-acidic [27]. In chronic kidney disease, this acid load has a genuine pathophysiological consequence: impaired renal acid excretion produces measurable metabolic acidosis, which in turn drives bone and muscle catabolism as the body buffers retained acid, and dietary interventions that increase plant protein and produce raise serum bicarbonate in CKD cohorts [31][32][33][34]. The alkaline-diet hypothesis extrapolates this CKD-specific mechanism to the general population, claiming that ordinary dietary acid load "leaches" calcium from bone to buffer acid and drives osteoporosis. This is evaluated critically in Section 5: recent evidence in community-dwelling older adults does not show reduced bone mineral density or increased fracture risk with more acidic habitual diets, and the observed benefit of "alkaline" eating patterns for bone appears attributable to their mineral density (potassium, magnesium, calcium) and overall dietary quality rather than to acid-base chemistry per se [28].

4. Clinical Relevance

Fluid and electrolyte disturbances are among the most common abnormalities encountered across every specialty — hyponatremia is the most frequent electrolyte disorder in hospitalized patients, hypernatremia in frail older adults carries mortality approaching 80% at three months in some cohorts, and RAAS-active drugs (ACE inhibitors, ARBs, mineralocorticoid receptor antagonists, and potassium-sparing diuretics) are simultaneously among the most beneficial and most electrolyte-hazardous medications in cardiology and nephrology [23][25][40]. Physicians are also the front line against hydration folklore: patients arrive anchored to "eight glasses a day," alkaline water marketing, and sports-drink advertising, and need an evidence-calibrated alternative that is neither dismissive of real risk (exercise-associated hyponatremia, dehydration in dysphagia and dementia) nor credulous of unsupported claims (alkaline diets curing acidosis in healthy kidneys).

5. Evidence Review

Established (high confidence):

• Plasma osmolality, thirst, and AVP form an integrated defense of water balance; in older adults, renal concentrating ability is unreliable and serum/plasma osmolality is the reference standard for detecting dehydration. AllNutrition evidence_strength: strong, consensus_level: moderate [1].
• RAAS and the renal potassium-switch mechanism jointly govern sodium/potassium balance and blood pressure; dietary sodium-to-potassium ratio predicts blood pressure and inflammatory markers better than sodium alone. evidence_strength: strong, consensus: moderate [6][8].
• Increasing dietary potassium (including potassium-enriched salt substitution, as in the Salt Substitute and Stroke Study) lowers blood pressure and reduces stroke and cardiovascular events. evidence_strength: strong, consensus: moderate [7].
• Higher fluid intake reduces kidney stone recurrence primarily by increasing urine volume and reducing supersaturation of stone-forming salts; sugar-sweetened beverages raise stone risk while citrus juices are protective. evidence_strength: strong, consensus: moderate [15][16][17][18].
• Exercise-associated hyponatremia is caused by fluid intake exceeding losses combined with impaired free-water clearance from persistent AVP activity during exercise, not primarily by sodium loss. evidence_strength: strong, consensus: mixed [5][22].
• Older adults have blunted thirst and impaired renal concentrating ability, making osmolality (not urine color or thirst) the appropriate clinical marker; minimum daily fluid targets of roughly 1.6 L (women) and 2.0 L (men) are recommended in geriatric guidance. evidence_strength: moderate, consensus: moderate [1][36].

Probable:

• The "8 glasses a day" rule is not evidence-derived; total water requirement is individualized (activity, fat-free mass, fiber/protein/alcohol intake, climate), with NASEM adequate-intake reference values of roughly 3.7 L/day (men) and 2.7 L/day (women) inclusive of food moisture. evidence_strength: strong, consensus: mixed [13].
• Mild-to-moderate dehydration meaningfully impairs endurance performance and raises perceived exertion, with more variable, generally smaller effects on objective cognition. evidence_strength: strong, consensus: moderate [10][11].
• Rapid correction of severe hyponatremia lowers mortality and osmotic demyelination syndrome remains rare even with faster correction, though undercorrection is associated with longer hospitalization. evidence_strength (systematic review): strong signal; consensus: moderate [6-source SALSA/meta-analysis findings] [23].

Emerging:

• Chronic habitual low water intake as an independent driver of long-term renal, metabolic, and hormonal strain in athletes and non-athletes, distinct from acute performance effects. evidence_strength: moderate, consensus: mixed [2].
• Precision/individualized sodium-potassium ratio targets (rather than single-nutrient thresholds) as the more clinically meaningful blood-pressure lever. evidence_strength: moderate, consensus: mixed [6][9].

Controversial:

• Whether dietary acid load has clinically meaningful effects on bone health or kidney stone risk in the general (non-CKD) population; a NEAP-kidney-stone association exists in cross-sectional NHANES data, but the causal magnitude and the broader "alkaline diet" bone hypothesis remain contested. evidence_strength: moderate, consensus: mixed [28][29].
• The clinical significance of total-body-water associations with gastrointestinal or metabolic outcomes in observational/Mendelian-randomization data, where obesity strongly confounds body-water estimates. evidence_strength: moderate, consensus: mixed [21].

Unsupported / overstated:

• The alkaline-diet claim that ordinary dietary acid load "leaches" calcium from bone and causes osteoporosis in people with adequate calcium intake; recent community-based data show no BMD reduction or fracture increase with acidic diets, and adequate protein (with sufficient calcium) is bone-protective, not harmful [28].
• The claim that caffeinated beverages or standard-strength (≤4% alcohol) drinks cause net dehydration; both contribute positively to daily fluid balance in the evidence reviewed [1].

6. Practical Clinical Applications

Fluid targets. Use individualized totals rather than a fixed rule: roughly 3.7 L/day (men) and 2.7 L/day (women) total water (food + beverages) as an adequate-intake anchor [13], adjusted upward for heat, activity, high fiber/protein/alcohol intake, and downward in fluid-restricted states (advanced heart failure, dialysis, SIADH) [1][13]. In frail older adults, target a practical minimum of ~1.6 L/day (women) and ~2.0 L/day (men), delivered as small, frequent, palatable servings (flavoring with lemon or herbs improves adherence), and consider that thickened liquids for dysphagia reduce effective free-water bioavailability [36][37][38].

Sodium and potassium. Guideline sodium ceilings cluster around <2,000 mg/day for the general population, with <1,500 mg/day (AHA) or as low as ~1,000 mg/day suggested for additional benefit in hypertensive patients; potassium targets of 3.5–5.0 g/day are recommended to optimize the sodium-to-potassium ratio, capped below ~2.4 g/day in advanced CKD given hyperkalemia risk [47]. Screen for hidden dietary sodium in effervescent formulations, sodium-based potassium-exchange resins, and IV normal saline, which can materially add to a patient's sodium burden without the patient's awareness [41].

Electrolyte/sports drinks. Reserve carbohydrate-electrolyte solutions for prolonged (>60–90 min), heavy-sweat-loss exercise or heat-stress recovery, where they outperform plain water for body-mass restoration and short-duration power maintenance; for routine daily hydration or short exercise bouts, plain water is sufficient and less costly [11][12][24].

Drug-electrolyte interactions to screen routinely. ACE inhibitors, ARBs, direct renin inhibitors (aliskiren), and mineralocorticoid receptor antagonists (spironolactone, eplerenone) → hyperkalemia risk, amplified by renal impairment or potassium supplementation [40][42][43]. Loop and thiazide diuretics → hypokalemia and hyponatremia risk; thiazides also risk hypomagnesemia. SSRIs, carbamazepine, and diuretics → hyponatremia via SIADH-like mechanisms. NSAIDs → reduced renal perfusion, worsening both hyperkalemia and fluid retention. Correct severe hyponatremia cautiously (guideline-concordant rate limits) to avoid osmotic demyelination while recognizing that undercorrection has its own morbidity cost [23].

CKD and acid-base. In CKD stages 3–5, favor a higher proportion of plant-derived protein sources, which lower dietary acid load and are associated with higher serum bicarbonate and better acid-base status without compromising muscle mass when total protein needs are met [31][33][34].

7. Clinical Pearls

• Osmolality — not thirst, not urine color, not "how they look" — is the reference standard for hydration status in older adults, because both thirst and renal concentrating ability are blunted by aging [1].
• "How much water?" has no universal number; ask about activity, climate, fiber/protein/alcohol intake, and medical fluid restrictions rather than reciting "eight glasses."
• Exercise-associated hyponatremia is a disease of too much fluid, not too little sodium — do not reflexively push fluids in a collapsed endurance athlete without checking sodium first.
• Potassium is not just "the other electrolyte" — the dietary sodium-to-potassium ratio predicts blood pressure and inflammation better than sodium alone, and this is the direct bridge to the hypertension module.
• The alkaline-diet/bone hypothesis is a case study in mechanism-outcome mismatch: PRAL/NEAP chemistry is real, but the leap to "acidic food causes osteoporosis" in people with adequate calcium is not supported by current bone-outcome data.

8. Common Misconceptions

• "Everyone needs eight 8-ounce glasses of water a day." No rigorous trial or guideline establishes this figure; requirements are individualized and total water includes food moisture [13].
• "Coffee and tea dehydrate you." Evidence indicates caffeinated beverages contribute net-positively to daily fluid balance; any mild diuretic effect of caffeine is outweighed by the fluid delivered [1].
• "Drinking more water always helps kidney or metabolic health." True for stone prevention and plausible for some metabolic markers, but in advanced CKD, heart failure, or SIADH, more water can be actively harmful and fluid must be individualized/restricted [1][19].
• "An alkaline diet is necessary to protect your bones from an acidic Western diet." Current bone-outcome evidence in the general population does not support this causal chain; adequate calcium and protein are the better-supported bone-protective levers [28].
• "If someone is dehydrated during exercise, give them more fluid." In prolonged endurance exercise, over-drinking — not under-drinking — is a well-documented mechanism of dangerous, sometimes fatal, hyponatremia [5][22].

9. Summary

Water and electrolyte balance is governed by a tightly integrated system: plasma osmolality drives thirst and AVP release to defend water balance, while the RAAS and a renal "potassium switch" jointly regulate sodium, potassium, and blood pressure — physiology that links this module directly to the hypertension curriculum. Dehydration meaningfully impairs endurance performance and raises perceived exertion, with more modest and inconsistent effects on cognition; overhydration, particularly during prolonged exercise, can cause life-threatening exercise-associated hyponatremia through impaired free-water clearance rather than sodium loss alone. The popular "eight glasses a day" rule lacks a rigorous evidence base; real fluid requirements are individualized by activity, diet composition, and clinical status, and are especially important to get right in older adults, whose blunted thirst and renal concentrating ability make osmolality — not thirst or urine color — the appropriate clinical marker. Adequate hydration reduces kidney stone recurrence through increased urine volume. Dietary acid load (PRAL/NEAP) is a real and clinically important consideration in chronic kidney disease, where it drives metabolic acidosis and catabolism, but the broader "alkaline diet" claim that ordinary dietary acidity erodes bone in the general population is not supported by current bone-outcome evidence — a instructive example of mechanism outrunning outcome data, echoing the appraisal discipline of Module 01. Clinically, fluid, sodium, and potassium management must account for age, renal function, and the substantial list of medications — RAAS inhibitors, diuretics, NSAIDs, SSRIs — that alter electrolyte handling.

10. References

Ordered by evidence strength / relevance. Evidence level and AllNutrition trust score (0–1) as returned by the tool.

1. Guía práctica de la Sociedad Europea de Nutrición Clínica y Metabolismo (ESPEN): Nutrición Clínica e Hidratación en Geriatría. Revista Española de Geriatría y Gerontología (2026). Guideline — trust 0.845.
2. Athlete Hydration: Beyond Performance Toward Long-Term Health. Sports Medicine (2026). Review — trust 0.675.
3. Skeletal muscle mass is not compositionally uniform: the role of fluid compartments in health and performance monitoring. European Journal of Clinical Nutrition (2026). Review — trust 0.863.
4. ESPEN guideline on nutrition and hydration in dementia — Update 2024. Clinical Nutrition (2024). Guideline — trust 0.907.
5. Increasing plasma sodium with Tolvaptan under regulated water intake: comparison with hypertonic saline. American Journal of Physiology-Renal Physiology (2026). Observational — trust 0.787.
6. Pathophysiological Mechanisms and Clinical Controversies of Sodium-Induced Hypertension: A Multi-Systemic Perspective. Nutrients (2026). Review — trust 0.85.
7. Rethinking the Impact of Dietary Sodium and Potassium on Blood Pressure to Advance Public Health. American Journal of Clinical Nutrition (2026). Review — trust 0.777.
8. Inverse association between dietary potassium-to-sodium ratio and systemic inflammatory markers: A cross-sectional analysis of NHANES 2021–2023. Medicine (2026). Observational — trust 0.775.
9. New evidence linking lifestyle factors to blood pressure: Focus on 2024 findings. Hypertension Research (2026). Review — trust 0.765.
10. Impact of cooling garments on performance during and after vigorous, heart-rate-clamped exercise in young males under hot and humid conditions. Physiological Reports (2026). RCT — trust 0.802.
11. Carbohydrate supplementation for endurance exercise in the heat: a systematic review with practical recommendations. Journal of the International Society of Sports Nutrition (2026). Systematic review — trust 0.827.
12. Effects of carbohydrate-electrolyte solutions with and without L-menthol on hydration and performance recovery following simulated firefighting exercise. Journal of the International Society of Sports Nutrition (2026). RCT — trust 0.835.
13. Use of Machine Learning to Identify Determinants of Habitual Preformed Water Intake. The Journal of Nutrition (2026). Observational — trust 0.77.
14. Increased fluid intake and blood pressure in healthy children: a randomized controlled trial. Pediatric Nephrology (2025). RCT — trust 0.817.
15. The role of vegetarian diet in Nephrolithiasis. Quality in Sport (2024). Review — trust 0.762.
16. Sweetened beverage intake and risk of incident kidney stone: results from the UK Biobank. Frontiers in Nutrition (2026). Observational — trust 0.762.
17. A Comprehensive Investigation Of The Prevalence And Risk Factors Associated With Renal Calculi In Southern India. Urological Science (2025). Observational — trust 0.677.
18. The impact of urine pH on lithogenic risk profile in children with urolithiasis. Pediatric Nephrology (2025). Observational — trust 0.752.
19. Low-protein diet for chronic kidney disease: Evidence, controversies, and practical guidelines. Journal of Internal Medicine (2025). Review — trust 0.74.
20. Consumption of sugar-sweetened beverages and all-cause mortality and cause-specific mortality: nationwide prospective cohort studies and GBD 2021. Diabetology & Metabolic Syndrome (2026). Observational — trust 0.762.
21. Association between total body water and the risk of gastrointestinal symptoms: NHANES and Mendelian randomization. BMC Gastroenterology (2026). Observational — trust 0.628.
22. Associations Between Hydration, Sodium Intake, and Body Mass in Ultra-Endurance Trail Runners Under Ecological Race Conditions. Physiologia (2026). Observational — trust 0.688.
23. Risk factors for undercorrection in severe hyponatremia: a post-hoc analysis of the SALSA trial. Kidney Research and Clinical Practice (2026). Observational — trust 0.89.
24. Temporal Stability, Reproducibility and Predictability of Whole-Body Sweat Sodium Concentration During Prolonged Cycling in the Heat. Nutrients (2026). Observational — trust 0.743.
25. Hypernatremia in Hospital-at-Home Patients: Prevalence, Clinical Profile, and Mortality in Institutionalized and Home-Dwelling Older Adults. Medical Sciences (2026). Observational — trust 0.702.
26. 24 Hour Ultra Marathon Running: A Narrative Review Of Performance Factors And Physiological Impacts. Sports Medicine - Open (2026). Review — trust 0.73.
27. The Potential Renal Acid Load Of Edible Marine And Land Snails. Journal of Nutritional Science (2022). Review — trust 0.68.
28. Nutrition and Osteoporosis Prevention. Current Osteoporosis Reports (2024). Review — trust 0.705.
29. Dietary Acid Load and Kidney Stones: NEAP Shows a Positive Association in a Nationally Representative Sample. Food Science & Nutrition (2026). Observational — trust 0.588.
30. New developments in epidemiological research on dietary patterns associated with chronic kidney disease. Frontiers in Nutrition (2026). Review — trust 0.875.
31. Rethinking protein choices: isocaloric substitution of dietary protein sources and dietary acid load in hemodialysis patients. BMC Nutrition (2026). Observational — trust 0.6.
32. Association between food group intakes and metabolic acidosis in patients with non-dialysis-dependent chronic kidney disease. BMC Nephrology (2026). Observational — trust 0.6.
33. Plant-dominant low-protein diet versus standard care in adults with chronic kidney disease stages 3–5: RCT protocol. Nutrition Research (2026). RCT — trust 0.802.
34. Traditional Brazilian dietary pattern as a factor associated with lower prevalence of dynapenic abdominal obesity in hemodialysis patients. BMC Nephrology (2026). Observational — trust 0.785.
35. On the optimal sodium correction rate in hyponatraemia and clinical outcome: a meta-analysis. Emergency Medicine Journal (2026). Systematic review — trust 0.842.
36. Nutrition Facts in the Over-Eighty Population: A Narrative Review. Nutrients (2025). Review — trust 0.727.
37. Risk factors and clinical impact of sodium and potassium disorders in community-acquired pneumonia. BMC Pulmonary Medicine (2026). Observational — trust 0.752.
38. Oropharyngeal Dysphagia as a Metabolic Emergency: A Comprehensive Review on Nutritional Barriers, Sarcopenia, and Management Strategies. Nutrients (2026). Review — trust 0.837.
39. Management of Hypertension in Patients Undergoing Peritoneal Dialysis: A Narrative Review. Cureus (2026). Review — trust 0.695.
40. The Dietary Management Of Sodium In Children With Kidney Diseases — Clinical Practice Recommendations From The Pediatric Renal Nutrition Taskforce. Pediatric Nephrology (2025). Guideline — trust 0.907.
41. The Exquisite Link Between Potassium Homeostasis Regulation and Cardiovascular Health. Frontiers in Physiology (2026). Review — trust 0.73.
42. Real-world safety of aliskiren in primary hypertension: A cross-database study. PLOS ONE (2026). Observational — trust 0.767.
43. Consensus on the management of hypertension in individuals with diabetes by Asian-Pacific Society of Hypertension (APSH) & Diabetes Asia Study Group (DASG). Journal of Human Hypertension (2026). Guideline — trust 0.9.

Supporting sources also surfaced: Furosemide plus oral sodium chloride for SIAD (Clinical Kidney Journal, observational, trust 0.752); Consumo de sodio: evidencias, controversias y recomendaciones prácticas (Nutrición Hospitalaria, review, trust 0.725); Diuretic-Induced Hypomagnesemia in Calcium Pyrophosphate Arthritis (Rheumatology and Therapy, observational, trust 0.752); The Physiologic Power Of Fluid Circulation And Implications For Fluid Therapy (Frontiers in Veterinary Science, review, trust 0.727).