Salt (Lavana) holds a dual role in Ayurveda—as a daily dietary necessity and a substance to be consumed in moderation. This article explores the six classical types of salt, their Ayurvedic properties, and the caution highlighted by Acharya Charaka regarding overuse. Bridging classical knowledge with modern science, it reveals how excessive salt intake contributes to cellular ageing, oxidative stress, hypertension, telomere shortening, and even carcinogenic risks. With today’s lifestyle and processed food habits, salt has become both a vital nutrient and a hidden danger. The article calls for mindful consumption, emphasising the need for choosing less processed salts and maintaining the recommended daily intake to avoid long-term health consequences.

Introduction

“SALT is to food, what soul is to the body.”

Lavana has been explained as both Dravya and Rasa in Ayurveda. Saindhava lavana is one among Nityasevaneeya dravya. There are mainly six varieties of lavana explained in the classics, viz., Saindhava, Vida, Samudra, Romaka, Sauvarchala and Chullika. Lavana in common has properties such as Ushna, Tikshna, Anatiguru, Anatisnigdha, Upakledi, Visransansamartha, and Annadravyarucikara. Acharya Caraka highlights on the excess use of lavana, and ill effects caused by it. It has been included under trividha varjya atisevaniya dravya. According to contemporary sciences, commonly used salts are rock salt / sodium chloride salt. Though the salt is the macronutrient, it should be consumed within the daily limits of consumption. The excess consumption of salts leads to the destruction of the tissues due to senescence. It may also lead to various systemic disorders.

Lavana – Trividha Atisevaniya Varjya Dravya

Carakaacharya mentions three substances which has be consumed in limited dose, such as Pippali, Kshara, Lavana. Lavana is one among the three things which has to be avoided to consume in excess. It has properties such as Ushna, Teekshna, Anatiguru, Anatisnigdha, Upakledi, Visramsanasamartana, Annadravyaruchikara, Apatabhadra, Rochana, Panchana. Excess consumption leads to dosha sanchaya, glani, shaitilya, dourbalya, shareera abhinivrutti. The people of villages, cities, communes and districts who use it continuously suffer from glani(depression), Shitilatwa of Mamsa Rakta (laxity of body tissues), Aparikleshasaha (intolerance to pain). Certain people use it with milk. All these people suffer from ageing with signs such as Khalitya, Palitya, Akalaja Vali-Pali.

Lavana has been given utmost importance in everyday life of human beings. It has been the taste, without which food becomes unpalatable. It is considered as both Ahara and Aoushada Dravya in Ayurveda. It is one among the Sadrasa and five basic tastes. Lavana varga is extensively elaborated in the classics, wherein Panchalavana is predominantly utilized. Panchalavana include Saindhava, Sauvarchala, Vida, Romaka/Audbhida and Samudra. It is said to possess various karma like Agnideepana,Pachana Ruchya Netrya Hridya Vrishya and Avidahi. Acharya Caraka has included Saindhava lavana in Nitya Sevaniya Dravya. Also, lavana is one among Trividha Atisevana Varjya Dravya. On exceeded intake it causes accumulation of doshas leading to doshotkshlesha. Its excessive usage causes Glani, Dhatu Shaitilya, Shareera Dourbalya which further leads to the senescence of the cells with the features such as Akalaja Khalitya, Palitya, Vali, Palita.

Contemporary View

According to contemporary sciences, body needs two varieties of supplements for proper growth and metabolism. They are Micronutrients and Macronutrients. And salt is categorized under Macronutrients. It flavours food and is used as a binder, stabilizer and food preservative. Today due to the rising industrialization and economic benefits salt has been considered one among white poisons, being the dreadful reason for various disorders. It’s been adulterated with many other chemicals in the name of fortification and being bleached to make it presentable. Using it as preservative in various eatables has made to cross the daily intake of salt leading to various diseases. Many researches have been conducted to determine the relation between the salt intake and ageing. Lowering sodium intake can slow down aging, especially in obese individuals. Obese/overweight teens in the high sodium intake group had significantly shorter telomeres compared with normal-weight teens in the same group. Telomeres are nucleoprotein structures that cap the ends of eukaryotic chromosomes and prevent chromosome fusion, thereby maintaining genomic stability. However, each cell division is associated with loss of a part of the telomere, such that as the telomeres shorten with aging, they reach a critical length and can no longer replicate. The cells then undergo senescence or die. Obesity is associated with high levels of inflammation, which also hastens telomere shortening and increases sensitivity to salt, which may help explain why higher sodium intake had a greater effect in that group. The high salt intake is directly linked to the telomere shortening and death of the cell which progresses ageing. Hence, this article is an attempt to showcase the potent deleterious effects of over usage or wrong usage of salt on the body.

Due to changing lifestyle, transforming diet patterns, rapid industrialization, dependence on processed food, people are consuming more energy dense foods that are high in salt and sugars. Salt is the primary source of sodium and increased consumption of sodium is associated with hypertension and increased risk of cardiovascular diseases and stroke.

Daily Limit of Consumption

The WHO recommends that adults consume less than 2,000 mg of sodium, equivalent to 5 grams of salt per day.

Processing of Salt

Salt is obtained from two sources: rock salt and brine. Rock salt is simply crystallized salt, also known as halite. Brine is water containing a high concentration of salt.

Iodized salt has been used to correct these conditions since 1924 and consists of table salt mixed with a minute amount of potassium iodide, sodium iodide, or sodium iodate. A small amount of dextrose may also be added to stabilize the iodine. In “doubly fortified salt”, both iodide and iron salts are added.

Sodium/ Potassium ferrocyanide also known as yellow prussiate of soda, is sometimes added to salt as an anticaking agent.

Potassium Ferrocyanide is an anti-caking agent that is needed to process salt and is allowed to be used in food-grade salts, however, only in the suggested quantities. Ferrocyanides help prevents powdered and granulated ingredients from forming lumps. It is slightly toxic, since adding acid to an aqueous solution releases toxic hydrogen cyanide gas. Although not mutagenic, it can cause irritation, if ingested, inhaled, or if it comes into contact with skin. It is therefore toxic in large amounts and accumulates in the body in any case because iodised salt is becoming increasingly common in most foods.

Effect of Salt on Oxidative Stress and Ageing

High-salt diet is known to induce or aggravate hypertension in animal models of hypertension and in humans. In the person with high salt intake and hypertension, there will be endothelial dysfunction i.e., altered vascular permeability due to impairment in Nitric oxide (NO) production. High salt intake decreases both plasma levels and urinary excretion of nitrates, i.e. reduced availability rather than decreased production of NO. NO interacts with superoxide anion, forming the potent oxidant peroxynitrite. Increased superoxide production in both vasculature and kidney was extensively reported in those with high intake of salt, in-turn increasing the oxidative stress in the organs. Increased Reactive oxygen and nitrogen species i.e. RONS levels lead to cellular senescence, a physiological mechanism that stops cellular proliferation in response to damages that occur during replication. Senescent cells acquire an irreversible senescence-associated secretory phenotype (SASP). RONS induce cellular senescence acting on various components of SASP. Aging is characterized by features such as wrinkling of skin, loss of elasticity, laxity, and rough-textured appearance of skin, greying of hair etc.

Early Cellular Aging: Salt and the Telomeres

Lowering sodium intake can slow down aging, especially in obese individuals, according to results presented at the recent American Heart Association (AHA) Meeting on Epidemiology and Prevention/Nutrition. Obese/overweight individuals with high sodium intake group have significantly shorter telomeres compared with normal-weight with high sodium intake. Each cell division is associated with loss of a part of the telomere, such that as the telomeres shorten with aging, they reach a critical length and can no longer replicate. The cells then undergo senescence or die. Thus, TL can serve as a biological clock to predict the lifespan of a cell or an organism. It is well-recognized that both obesity and high sodium intake are important risk factors for age-related diseases such as cardiovascular disease, stroke and cancer. Obesity, a chronic state of inflammation, has been shown to be inversely associated with telomere length in adults in a recent meta-analysis. In vitro and in vivo studies reported that high salt diets through oxidative damage have promoted cell senescence, retarded growth and markedly decreased the life span. In addition, high salt diets have promoted tissue inflammation and accelerated development of autoimmunity. A high salt condition also increased reactive oxygen species. Both inflammation and oxidative stress reduce telomere length.

Salt and Carcinogenicity

Areas where people ingest more sodium chloride show an elevated incidence of gastric cancers. High salt intake causes damage of mucous membrane In stomach, as evidenced by the existence of malondialdehyde in extracts of gastric mucous membranes after sodium chloride administration. Malondialdehyde, a product of lipid peroxidation that could be generated by damage of cell membranes, has previously been reported to be mutagenic to bacteria and mammalian cells and carcinogenic to rats. Recently, malondialdehyde-deoxyguanosine adducts were detected in human liver. It is therefore likely that sodium chloride-lipid peroxidation-malondialdehyde-mutation scenarios play a role in carcinogenesis in the stomach. H. pylori infection in the mucosa of the stomach results in gastritis, which may increase formation of nitric oxide as well other proliferative stimuli. It is therefore a factor that might facilitate accumulation of gene alterations.

Health Effects of Excessive Salt Consumption

1. Hypertension – Increased salt consumption may provoke water retention, thus leading to a condition of high flow in arterial vessels. Excessive salt intake may induce several adverse effects, causing microvascular endothelial inflammation, anatomic remodeling, and functional abnormalities, even in normotensive subjects. hypertension may occur only when the ability of the kidney of excreting sodium is impaired. Further evidence has shown that the BP response to changes in salt intake in diet has a significant variability among individuals in the general population. This phenomenon was defined as salt-sensitivity of BP.

2. Water retention: When humans go from a low to a high salt intake, there is retention of salt and thereby water, and this expands the extracellular volume. This increase in extracellular volume is a trigger for various compensatory mechanisms.

3. Direct effect on stroke: About one-third of people are sensitive to the sodium component of salt. This means that eating foods with too much salt can increase the amount of blood in the arteries, raising blood pressure and increasing the risk of stroke.

4. Direct effect on left ventricular mass: Among various genetic, haemodynamic and humoral determinants, dietary salt intake has been demonstrated to influence left ventricular mass in hypertensive disease.

5. Cancer of the stomach: Foods that contain high concentrations of salt are irritating to the delicate lining of the stomach. It is possible that this makes H-pylori infection more likely or more severe and that the H-pylori infection then leads to stomach cancer.

6. Proteinuria and renal disease: Increasing salt intake increases urinary protein excretion and markedly increases the rate of deterioration of renal function. salt intake relates, to the amount of protein or albumin excretion, which is an important risk factor for the development of kidney disease and CVD.

Conclusion

Lavana is regarded as both nityasevaneeya and varjya dravya, because of which it should be consumed in proper and required quantity daily. One should not exceed the daily limit of consumption. Salt been explored in depth by modern sciences, explains about pros and cons of salt intake. One should select the salt which is less processed with chemicals and has least effects on health. Exceeded intake of it will cause early ageing, damage of various organs and cause various disorders.