Salt and Water Fasting
Before, During, and After Fasting – Guide for a 7-Day Water Fast
Water fasting is an ancient practice, found both in spiritual traditions and in various modern therapeutic approaches. Among its commonly associated effects are detoxification, activation of cellular autophagy, and metabolic regulation.
An essential – but often overlooked – aspect is the proper management of salt (sodium) intake before, during, and especially after fasting.
I. Salt Before Fasting
During the preparation period – ideally 3 – 7 days before starting the fast – it is recommended to follow a diet that is:
- low in animal protein and fats
- free from refined sugar and processed foods
- moderately low in sodium (gradually reducing salt intake)
Why Is Gradual Salt Reduction Important?
The body needs time to adapt to lower sodium levels in order to avoid sudden electrolyte imbalances.
A high salt intake before fasting may lead to:
- water retention
- excessive urination in the first days of fasting
- rapid loss of sodium and potassium
Recommendations
- gradually reduce salt intake 3 – 5 days before fasting
- avoid highly salted processed foods (canned foods, processed meats, salty cheeses)
- stay well hydrated: 2 – 2.5 litres of water per day, preferably clean, still water
II. Salt During Fasting (7 Days – Water Only)
During fasting, the body undergoes important metabolic changes:
- glycogen stores are depleted, leading to loss of water and sodium
- the kidneys excrete more sodium due to reduced insulin levels
- ketosis and autophagy begin, making electrolyte balance more sensitive
What Happens to Sodium?
Sodium is naturally lost through urine. If this loss is not balanced, symptoms of low sodium (hyponatremia) may appear, such as:
- headaches
- dizziness
- confusion
- difficulty concentrating or speaking
- low blood pressure
Should Salt Be Consumed During Fasting?
Normally, salt is not consumed during a water fast.
Exceptions
In some supervised fasting programmes, it has been observed that certain individuals may develop neurological symptoms, especially after day 4 or 5.
In such cases, a controlled intake of about 1 gram of salt (NaCl) – approximately 400 mg of sodium – may help restore electrolyte balance and relieve symptoms, without interrupting the fasting process.
This should only be done under supervision, with monitoring of:
- blood pressure
- cognitive state
- urination and general condition
III. Salt After Fasting (Refeeding Period)
The refeeding period is the most sensitive phase of fasting.
After a 7-day fast:
- the kidneys begin to retain sodium again
- digestive enzymes are still recovering
- tissues are highly sensitive to sudden sodium intake
What Happens If Salt Is Reintroduced Too Quickly?
Sudden salt intake may cause:
- water retention
- swelling (oedema)
- bloating
- increased blood pressure
- general discomfort
In some cases, refeeding syndrome may occur – a potentially serious metabolic reaction.
Basic Rule
The period without added salt should be at least twice as long as the fasting period.
For a 7-day fast, it is recommended to avoid added salt for at least 14 days after refeeding begins.
What Does “No Salt” Mean?
During this period, avoid:
- adding salt to food
- processed foods (canned foods, pickles, salty cheeses, processed meats)
The only acceptable alternative may be sodium-free salt (potassium-based), available in pharmacies.
Final Notes
- Salt is essential for the body, but during fasting it must be carefully managed
- Fasts longer than 5 days should ideally be done with guidance or medical supervision
- The sodium – potassium balance is critical during fasting and refeeding
Any sodium intake after fasting should be balanced with adequate potassium intake, mainly from fresh plant-based foods or specially formulated sodium-free products.