What is salt?

Salt—chemically, sodium chloride (NaCl)—is an essential mineral that is indispensable for numerous bodily functions. It consists of about 40% sodium and 60% chloride and plays a central role in regulating fluid balance, nerve transmission, blood pressure, and acid-base balance.

Salt has been an important food for thousands of years—once a valuable trade commodity, today a staple of the modern diet. But as with many nutrients, the amount makes all the difference.

Composition and types of salt

  • Sodium chloride (NaCl): The main component, responsible for its physiological effects.

  • Iodized table salt: Enriched with iodine to prevent iodine deficiency and thyroid disorders.

  • Fluoridated salt: Also contains fluoride to protect teeth.

  • Sea salt, rock salt, Himalayan salt: Natural varieties that differ in taste and appearance but have a similar nutritional composition.

How does salt work in the body?

1. Regulation of fluid balance:
Sodium in salt binds water in the body and ensures that fluid remains evenly distributed between cells and the bloodstream. Without sodium, the body could neither retain water nor stay properly hydrated.

2. Nerve and muscle function:
Sodium and chloride are essential electrolytes that enable electrical impulses in nerves and muscles. Without enough salt, muscle contractions, heartbeats, or nerve signal transmission would not be possible.

3. Blood pressure control:
Sodium affects blood volume and therefore blood pressure. Too little or too much salt can throw it off balance.

4. Acid-base balance:
Chloride is a component of stomach acid (hydrochloric acid) and supports digestion as well as maintaining a stable pH level in the body.

5. Supports metabolism:
Salt helps the intestines absorb other nutrients (e.g., glucose, amino acids) and plays a role in nutrient transport across cell membranes.

Benefits of a balanced salt intake

  • Supports fluid balance

  • Enables normal nerve and muscle function

  • Promotes healthy digestion through the production of stomach acid

  • Supports blood pressure stability as part of a balanced diet

  • Improves the flavor and shelf life of foods

Risks of excessive salt consumption

Consistently high salt consumption can strain the kidneys and lead to increased blood pressure (hypertension) – a risk factor for cardiovascular disease.

Long-term effects of too much salt:

  • High blood pressure and strain on the heart

  • Fluid retention (edema)

  • Impaired kidney function

  • Increased risk of stroke and heart attack

Many processed foods (e.g., bread, cheese, sausage, convenience foods, snacks) contain hidden salt – about 75% of daily intake comes from industrially manufactured products.

Risks of too little salt

A salt deficiency is rare but can occur with heavy sweating, diarrhea, or extreme physical exertion. Symptoms:

  • Muscle weakness or cramps

  • Dizziness, low blood pressure

  • Nausea, headaches

  • Difficulty concentrating

Recommended daily intake

According to the German Nutrition Society (DGE):

  • Maximum 6 g of salt per day (about 1 level teaspoon)
    This corresponds to about 2.4 g of sodium.

Athletes or people experiencing significant fluid loss (e.g., through sweating) may need more salt in the short term to stabilize electrolyte balance.

Tips for mindful salt consumption

  • Use herbs and spices for flavor instead of excessive salt.

  • Choose fresh, unprocessed foods.

  • Choose iodized and fluoridated table salt for additional nutrient intake.

  • Read labels: Many convenience foods contain “hidden sodium” (e.g., monosodium glutamate, sodium bicarbonate).

Conclusion

Salt is essential for life, but harmful to health in excess. It regulates fluids, nerves, muscles, and blood pressure – but only when in a balanced ratio with other electrolytes such as potassium. Mindful use of salt, combined with fresh foods and moderate consumption of processed products, contributes significantly to cardiovascular health, performance, and well-being.

Sources

  1. German Nutrition Society (DGE). (2020): Sodium, chloride, and salt – DGE recommendations.

  2. He FJ, MacGregor GA. (2010): Reducing population salt intake worldwide: from evidence to implementation. Prog Cardiovasc Dis, 52(5), 363–382.

  3. WHO (World Health Organization). (2012): Guideline: Sodium intake for adults and children.

  4. Graudal NA, et al. (2017): Intake of sodium, potassium, and the sodium-to-potassium ratio and cardiovascular risk. Eur Heart J, 38(44), 3353–3360.