Sodium
| Sodium | |
|---|---|
| Chemical formula | Na (element); biological form mainly Na⁺ in extracellular fluid |
| Solubility | Sodium salts are generally water-soluble; chloride is the usual dietary counter-ion |
| Bioavailability | Nearly complete absorption of dietary sodium; renal excretion adjusts balance |
| Dietary sources | Salt, baking soda, cheese, shellfish, broth; see Salt for Peat's form preferences |
| RDA (adults 19–50 y) | 1,500 mg/day sodium (US adequate intake); 2,300 mg/day limit in mainstream guidelines |
| Upper limit | No firm UL for food sodium; excess raises blood pressure in salt-sensitive people in mainstream epidemiology |
Sodium (Na⁺) is the dominant extracellular cation, paired with chloride in Salt. Mainstream guidelines often restrict sodium for hypertension. Peat cited survey data where higher salt intake correlated with lower blood pressure, and treated sodium as part of mineral and stress chemistry with Calcium and Magnesium.[1] See Salt for culinary and practical detail.
History
[edit]Etymology
[edit]The English name comes from "soda." The chemical symbol Na comes from Latin natrium, itself from Arabic natrun, referring to natron, a naturally occurring sodium-rich mineral used in ancient Egypt for mummification.
Humphry Davy isolated metallic sodium in 1807 by electrolysis of caustic soda.
Structure/Chemical properties
[edit]Sodium (atomic number 11) is mainly extracellular in Peat's ion summary, paired with Calcium, while Magnesium and potassium dominate intracellular fluid when metabolism is efficient.[2] Stressed cells lose magnesium and potassium and take up sodium and calcium in his calcium article.[3]
Function/Mechanism of Action
[edit]About 25 years ago, David McCarron noticed that the governments data on diet and hypertension showed that the people who ate the most salt had the lowest blood pressure, and those who ate the least salt had the highest pressure.
— Ray Peat
Peat listed sodium among antioxidants/chain breakers in iron-dangers writing, reflecting its role in maintaining electrical and osmotic stability under stress.[5] Very low sodium raises magnesium loss through aldosterone in his calcium article.[6]
Salt, which helps to maintain blood sugar, also tends to lower adrenalin, and hypothyroid people often lose salt too easily in their urine and sweat.
— Ray Peat (via FunctionalPS)
Increased salt intake is protective against excess Estrogen and pregnancy toxemia in Peat's estrogen writing.[8] Serum sodium is a useful thyroid-context lab in his hypothyroidism article.[9]
= SSRI-induced hyponatremia
[edit]SSRI and venlafaxine initiation sharply raises risk of serum sodium falling below 125 mEq/L, especially in the first three months of treatment.[10]
Chronic hyponatremia and anxiety
[edit]Prolonged dietary sodium restriction that induces chronic hyponatremia reduces amygdalar serotonin and dopamine in mice, producing anxiety-like behaviors that reverse when sodium is restored.[11]
Salt restriction and cortisol
[edit]High-salt diet (4% NaCl chow plus 1% saline water) slowed B16 and Lewis lung carcinoma growth in mice by functionally inactivating myeloid-derived suppressor cells and boosting anti-tumor immunity.[12]= Dietary sodium restriction decreases urinary free cortisol excretion and is associated with higher circulating cortisol concentrations, implying that low-sodium diets may amplify HPA-axis stress chemistry.[13]
Medical uses/Effects
[edit]Mainstream medicine uses sodium chloride IV fluids and oral rehydration. Peat's dietary emphasis is adequate salt with minerals and carbohydrate when Hypothyroidism, night hypoglycemia, or adrenaline excess appear, not chronic sodium fear alone.[14] Baking soda in water supplies sodium in community practice he referenced in email compilations.
Side/Adverse effects
[edit]Excess salt can irritate the stomach; salt appetite is usually a good guide to need in Peat's email notes. Low-sodium diets can worsen magnesium balance and stress chemistry in his calcium writing.[15] See Harm reduction.
Dosing
[edit]No fixed gram dose; salt appetite, pulse variation with meals, and pairing with Glucose and Thyroid support guide intake in his hypothyroidism interview.[16] Full salt discussion: Salt.
References
[edit]- ↑ "Calcium and Disease: Hypertension, organ calcification, & shock, vs. respiratory energy," Ray Peat article
- ↑ "Calcium and Disease: Hypertension, organ calcification, & shock, vs. respiratory energy," Ray Peat article
- ↑ "Calcium and Disease: Hypertension, organ calcification, & shock, vs. respiratory energy," Ray Peat article
- ↑ "Calcium and Disease: Hypertension, organ calcification, & shock, vs. respiratory energy," Ray Peat article
- ↑ "Iron's Dangers," Ray Peat article
- ↑ "Calcium and Disease: Hypertension, organ calcification, & shock, vs. respiratory energy," Ray Peat article
- ↑ "Ray Peat, PhD on Thyroid, Temperature, Pulse, and TSH"
- ↑ "Not the "female hormone," but the shock hormone," Ray Peat article
- ↑ "TSH, temperature, pulse rate, and other indicators in hypothyroidism," Ray Peat article
- ↑ SSRI-associated severe hyponatremia, Eur J Endocrinol. 2025. doi:10.1093/ejendo/lvaf179.
- ↑ Fujisawa S, Magara K, Nakayama T, et al. "Chronic hyponatremia and anxiety-like behavior," Mol Neurobiol. 2025. doi:10.1007/s12035-025-05024-y.
- ↑ Schwartz L, et al. "High-salt diet and tumor immunity," Front Immunol. 2019. doi:10.3389/fimmu.2019.01141.
- ↑ Chen AX, et al. "Dietary sodium intake and cortisol measurements," Clin Endocrinol (Oxf). 2020;93(5):527-534. PMID 32511774.
- ↑ "Ray Peat, PhD on Thyroid, Temperature, Pulse, and TSH"
- ↑ "Calcium and Disease: Hypertension, organ calcification, & shock, vs. respiratory energy," Ray Peat article
- ↑ "Ray Peat, PhD on Thyroid, Temperature, Pulse, and TSH"