Hunger, or fasting, is an innate instinct of our nature. The voluntary cessation of food intake leads to surprising changes in the human body.
Fasting offers health and strength to man. There is no single method of treatment that can be compared with fasting in terms of its effect on the entire organism.
Fasting is considered beneficial in conditions such as asthma, allergies, skin diseases, heart diseases, disorders of the joints and spine, gastric and duodenal ulcers, the early stages of diabetes, benign tumours, and in many other diseases. Therapeutic fasting can also improve mental health.
Fasting is a powerful spiritual practice, passed down from the depths of the ages and confirmed by the experience of time. There is no religion in which fasting is not present.
Indeed, why would a modern person, in an age of advanced development of science and medicine, need fasting? This question is often asked by those who discover the method of therapeutic fasting for the first time.
If we look more closely, however, the modern person has no fewer reasons to practise fasting than people in the past. Despite the progress of science and remarkable discoveries in various fields of knowledge, our life has not become easier. On the contrary, each of us is constantly exposed to a multitude of negative factors.
We are increasingly sedentary, few people still engage in physical activity, the food products we consume contain preservatives, pesticides, and various additives, we breathe polluted air, drink water of questionable quality, and live at a fast pace dominated by stress. All these affect health and reduce the quality of life.
Modern medicine does not always manage to solve these problems. Sometimes, the struggle with these negative factors through numerous medications can even worsen the situation. After placing hope in medicines and not obtaining the desired results, the modern person begins to seek other therapeutic methods.
Thus, a paradoxical situation arises: we overeat, smoke, consume alcohol, do not exercise, and then go to the doctor and try to solve all health problems with expensive pills. Of course, this approach cannot bring lasting results. No matter how expensive a medicine is, it remains only a chemical substance that cannot fundamentally change the way the body functions.
Fasting, on the contrary, without material cost, can contribute to counteracting many harmful factors present in our lives.
Overeating – By practising fasting, we reach a different level of relationship with food. Whether we like it or not, in order to practise fasting we must adopt for a period a simple diet, often vegetarian. Abstaining from food for a certain period helps a person control the food instinct and gradually reduce dependence on food and the tendency to overeat.
Obesity – Fasting is considered by many to be one of the most effective methods of reducing body weight. During fasting, the body switches to internal nutrition, using its own energy reserves. In this way, excess weight can be reduced in a relatively short time. Regular fasting practices can also contribute to the normalisation of metabolism, which helps maintain a balanced weight and improve certain conditions associated with obesity.
Stress and Dissatisfaction – Fasting can help the body cope with stress and psychological tension. During fasting, attention often shifts from daily agitation to the internal processes of the body. As the experience of fasting is repeated, many people notice that the mind calms down, and the brain benefits from a valuable period of rest. After the end of fasting, the general state can be one of energy, clarity, and renewal.
Illness – As a result of all the harmful factors mentioned above, the human body begins to function with difficulty, and the harmonious interaction between different organs and systems can be disturbed. Excessive use of medicines can sometimes turn certain conditions into chronic problems. Fasting offers the body the possibility to activate its own mechanisms of recovery. The temporary lack of food allows the body to mobilise its internal resources and trigger natural processes of self-regulation.
Thus, the necessity of fasting for the contemporary person becomes evident.
In this sense, we can say that for the modern person fasting is an important skill, similar to other essential abilities for life. The only thing necessary is to learn how to fast correctly.
Fasting is a universal method of recovery and support for health, and one of its most important advantages is that it can also be practised at home.
Fasting at home is not only possible, but for many people it can even be a suitable option. To begin fasting, it is not necessary to be a doctor or a specialist in the field. If you wish to improve your health through fasting, you do not need expensive medicines or complex investigations. What is required, first of all, is the desire and determination to carry this process through to the end.
In reality, every person is capable of fasting, because this ability is part of our nature. It is an innate capacity that, to a large extent, we have forgotten how to use.
In this sense, learning how to fast is not much more difficult than learning how to drive a car. If driving requires an experienced instructor, in order to understand fasting it is sufficient to become familiar with specialised literature or to find a person with experience who can guide you in the initial stages.
Fasting carried out independently, at home, may be practised especially in the following situations:
– you do not suffer from serious illnesses that require constant medication;
– you are in a stable psychological state and have the necessary determination to follow this practice.
If, for certain reasons, you do not feel safe to fast at home, you may turn to the services of a specialised clinic. There, under the supervision of specialists or individuals with experience in fasting, you will be able to go through this experience in safe conditions and will have the opportunity to better understand this method of recovery and balancing of the body.
Approximately one week before the beginning of the fast, it is recommended to gradually reduce the consumption of meat, fatty foods and strong spices, as well as alcohol, which can stimulate the appetite.
A suitable option for this period is the adoption of a lacto-vegetarian diet. Such a diet can make the transition to fasting easier and can contribute to the reduction of appetite.
It is also important to choose the right moment for fasting. A one-day fast can be kept at any time of the year. For the first longer fast (of 5 days or more), a suitable period may be the end of summer or the beginning of autumn – for example, the months of July, August or the beginning of September. During this period, temperatures are more favourable, there is a great variety of fruits and vegetables, and the time spent outdoors can contribute to a better general state.
The first one-day fast is recommended to be kept on a free day, in order to avoid stress and excessive effort. Longer fasts are easier to go through when they are planned during the holiday period, in a quiet environment – in the countryside, in the mountains or in organised fasting camps, where there are suitable conditions for rest and recollection.
Fasting may improve blood circulation, may contribute to the reduction of high blood pressure, supports the body’s metabolic processes, and may promote the elimination of certain unwanted substances from the body. It may also improve microcirculation. All these effects may indirectly influence the functioning of the eyes.
Many of those who practise fasting claim that it may contribute to the improvement of certain eye conditions, such as cataract, keratitis, or glaucoma. Fasting may also contribute to the normalisation of intraocular pressure.
In general, short periods of fasting, of 1 – 3 days, are unlikely to produce significant effects on vision. Most often, any improvements are observed in the case of longer fasting periods.
Even in the case of a 7-day fast, the body is only beginning to adapt to internal nutrition, and deeper processes of regulation and recovery may require more time. However, longer periods of fasting are not always safe or easy to carry out.
Some specialists in therapeutic fasting recommend, for supporting eye health, fasting periods of approximately 7 – 10 days, followed by a diet based on fresh juices, as well as a lacto-vegetarian diet during the recovery period. Regular consumption of carrot juice is also recommended.
If this practice is repeated approximately four times per year, at the change of the seasons, the effects may become more noticeable.
If you wish to use fasting for the improvement of a specific eye condition, it is recommended to consult a specialist familiar with this method. In some cases, longer fasting periods may be necessary, which should be carried out under the supervision of a specialist or in a specialised clinic.
The need to perform an enema at home may arise in the following situations:
- For intestinal cleansing, which may be necessary in cases of constipation, during preparation for fasting or during fasting itself, as well as within certain weight management programmes.
- For the administration of specific medications, used in various conditions such as prostatitis, haemorrhoids, certain gynaecological disorders, liver or kidney conditions, or in cases of high fever.
- For the preparation of medical procedures, such as colonoscopy, anoscopy, or certain ultrasound examinations.
If you use enemas independently, it is important to be aware of the contraindications of this procedure.
Absolute contraindications:
– any type of bleeding from the digestive tract;
– fissures or ulcerations in the anal region;
– inflammation in the anal area;
– acute inflammatory processes or ulcerations of the large intestine;
– rectal cancer;
– the first days following surgical interventions involving the digestive organs;
– abdominal pain of unknown origin;
– infectious diseases accompanied by diarrhoea.
It is also recommended to avoid performing this procedure on your own if you have any doubts regarding the correct procedure.
In such situations, it is advisable to consult your physician or a person experienced in performing this procedure.
How to Perform an Enema
For performing an enema, special medical devices may be used, which can be purchased from pharmacies, as well as certain simple devices used in the household.
1. Esmarch Mug (Esmarch Irrigator)
The Esmarch mug was invented more than 150 years ago by the German surgeon Friedrich August von Esmarch. It is a container with a capacity of approximately 1 – 2 litres, fitted with a flexible rubber or silicone tube and a clamp for regulating the flow of liquid. For home use, a reusable model is recommended.
2. Rectal Bulb (Enema Bulb)
Bulb syringes of various sizes are available, used especially for the rectal administration of medications or for performing enemas in children.
3. Enema Irrigator
Special enema irrigators are also available in pharmacies, designed to facilitate this procedure under conditions of hygiene and safety.
The type of solution used for an enema depends on the purpose of the procedure.
In the case of cleansing enemas, water-based solutions are most commonly used.
The main principle is that the water used should be as clean and microbiologically safe as possible. A portion of the liquid introduced into the intestine may be absorbed through the intestinal mucosa and may enter the bloodstream. For this reason, it is recommended to use water of good quality.
The most suitable options are:
- filtered drinking water;,
- boiled water, cooled to body temperature;,
- safe potable water from the public supply..
The temperature of the liquid used for the enema should, in general, be close to body temperature (approximately 36 – 37°C), in order to avoid discomfort or irritation of the intestinal mucosa.
The temperature of the water used for an enema is usually 36 – 37°C, close to body temperature.
Water that is too cold may cause intestinal spasms, which can make the introduction of the liquid more difficult and may produce discomfort.
Water that is too warm is not recommended, as it may irritate the mucosa of the large intestine and may promote the absorption of liquid through the intestinal wall.
For safety, the temperature of the solution should be checked with a thermometer before use.
The volume of solution used for a cleansing enema in adults is generally approximately 1 – 1.5 litres. In certain situations, the volume may reach up to 2 litres, but it is not recommended to exceed this amount.
This quantity is usually sufficient for the evacuation and cleansing of the lower segments of the large intestine.
The exact volume may vary depending on:
- the person’s tolerance;
- the purpose of the procedure;
- the experience of the person performing the enema.
In practice, administration is carried out gradually, and if discomfort or a strong urge to evacuate occurs, the introduction of the liquid should be stopped.
The enema device usually consists of a container with a volume of 1 – 2 litres, a flexible tube, a tip (cannula), and a clamp or tap for regulating the flow.
The enema should be performed in a quiet and relaxed environment, without interruptions. The bathroom is usually the most suitable place for this procedure.
The container with the liquid should be suspended at a height of approximately 1 – 1.5 metres above body level.
The tip (cannula) is lubricated with oil or an appropriate lubricant and gently inserted into the anus approximately 5 – 7 cm. The insertion should be done slowly and without force, in order to avoid irritation or injury to the rectal mucosa.
After inserting the cannula into the rectum, one of the following positions may be adopted:
- lying on the left side, with the knees drawn towards the chest;,
- the knee-chest position (kneeling, supported on the elbows)..
After opening the clamp or tap, the introduction of the liquid into the intestine begins. To avoid discomfort or pain, the flow of the liquid should be regulated so that it is introduced slowly and steadily.
After the liquid has been introduced, the cannula is carefully removed. It is recommended to retain the liquid in the intestine for approximately 5 – 10 minutes, if tolerated. During this time, the person may remain lying down and gently massage the abdomen to facilitate the distribution of the liquid in the lower colon.
After this interval, one may go to the toilet for evacuation. After performing the enema, a short period of rest is recommended to allow the body to relax.
Some people consider that smoking is not related to nutrition and believe that a cigarette during fasting would not have significant consequences. In reality, this idea may be misleading.
Smoking has well-documented harmful effects on the body. Tobacco smoke contains thousands of chemical substances, many of which are toxic, and approximately 70 are known to have carcinogenic potential.
Among the substances identified in tobacco smoke are:
- nicotine, the substance responsible for dependence;
- carbon monoxide, which reduces the blood’s capacity to carry oxygen;
- formaldehyde;,
- acrolein;,
- amoniacul,
- nitrogen oxides;,
- hydrogen cyanide;,
- benzene;,
- as well as many other toxic substances.
Tobacco smoke also contains traces of radioactive elements, such as polonium-210 and lead-210, originating from the soil and fertilisers used in tobacco cultivation.
During combustion, the temperature in the burning zone of a cigarette may reach approximately 700 – 900°C, and the resulting substances are inhaled into the lungs. Nicotine reaches the brain within seconds after inhalation.
Under normal circumstances, the body of a smoker partially adapts to the effects of tobacco smoke, and some acute reactions become less noticeable.
During fasting, however, the body may become more sensitive to inhaled toxic substances, and some individuals may experience symptoms such as:
- dizziness;
- weakness;
- nausea;
- sometimes vomiting.
These manifestations may intensify as fasting continues, as energy intake is reduced and the body is in a different metabolic state.
For these reasons, smoking is not recommended during fasting.
On the other hand, fasting may represent a favourable moment for some individuals to quit smoking, as metabolic changes and alterations in daily routine may temporarily reduce the desire to smoke.
In the literature on therapeutic fasting, a stage known as the “acidosis phase” is described. This term refers to the period during which the body completes the metabolic transition from using glucose derived from food to using its own energy reserves, especially fats.
From a physiological perspective, this stage corresponds to the onset of ketosis, a metabolic process in which the liver produces ketone bodies that are subsequently used as a source of energy by the body.
In individuals fasting for the first time, this transition usually occurs after approximately 6 – 9 days of fasting. In some cases, it may occur earlier or later, depending on individual characteristics. In experienced individuals, metabolic adaptation may occur more rapidly, sometimes even between days 3 – 5.
The speed of this transition also depends on preparation before fasting. A predominantly plant-based diet in the days preceding fasting, as well as avoiding alcohol and hard-to-digest foods, may facilitate metabolic adaptation.
The literature describes several signs that may indicate the onset of this phase:
- slowing of the rate of weight loss;
- reduction of the whitish coating on the tongue;
- decrease in the characteristic breath odour;
- reduction of the sensation of hunger;
- improvement in general condition and increased energy levels.
After this stage, the body relies more on its own energy reserves, and adaptation to fasting becomes more stable.
– a sudden improvement in general condition, sometimes even within an hour, manifested by a surge of energy, a reduction in the sensation of hunger, and a decrease in other unpleasant symptoms that occur in the first days of fasting;
– the beginning of the clearing of the whitish coating on the tongue and a reduction in unpleasant breath odour;
– reduction or disappearance of the acetone-like smell of the breath or body;
– urine becomes clearer, provided there is adequate fluid intake;
– slowing of the rate of weight loss, from approximately 1 – 1.5 kg per day to approximately 300 – 500 g per day.
All these signs indicate that the body has adapted to the use of its own energy reserves and that metabolism has entered a more stable phase of fasting.
At this point, fasting may be continued if deeper effects are desired, or gradual refeeding may be initiated, since the main adaptive processes of the body have already taken place.
Some people are particularly concerned about the need to perform enemas during fasting. For this reason, many beginners consider that this unpleasant procedure is not mandatory.
In the practice of therapeutic fasting, enemas are frequently used, especially by those who are at the beginning. Therefore, it is useful, during the preparation period, to learn how to correctly perform this simple procedure.
During the preparation phase, enemas may be used to empty the large intestine, sometimes instead of using a laxative, at the beginning of the fasting period.
During fasting, especially in the first days, enemas may help reduce discomfort associated with the body’s adaptation to the absence of food. In some therapeutic fasting programmes, they are used daily during the first 7 – 10 days, and later every 2 – 3 days if fasting continues.
When reintroducing food after fasting, some individuals use enemas in the first days of refeeding, when digestive functions are not yet fully restored. In this context, enemas may help prevent constipation.
For enemas, clean water at body temperature is generally used. Various additives (salt, herbs, potassium permanganate, etc.) are sometimes mentioned, but their use should be approached with caution. In general, for cleansing enemas, plain water is recommended, as it is well tolerated by the intestinal mucosa.
Emptying the intestines through enemas may help reduce certain unpleasant symptoms that may occur at the beginning of fasting, such as abdominal discomfort or constipation.
During longer fasting periods, enemas are sometimes used to facilitate the evacuation of residual intestinal contents from the colon.
An increase in appetite upon ending a fast is a common phenomenon. Many people who begin practising fasting encounter this situation. This is not surprising, as during fasting the body uses its internal reserves in an economical manner, and when these decrease, upon refeeding the body attempts to restore consumed resources as quickly as possible. If we also consider the increase in metabolic activity that may occur after fasting, the result can be a very strong appetite during the refeeding period.
The modern individual is already characterised by excessive or sometimes uncontrolled food consumption, and after a period of dietary restriction, control over food intake may become more difficult. Thus, after losing several kilograms during fasting, some individuals quickly regain the initial weight and may even gain additional weight. This can be frustrating, especially when fasting is also used for weight reduction.
To avoid such situations, several precautionary measures are recommended.
Gradual practice of fasting
In order to achieve good results, fasting should be practised gradually. It is best to begin with short fasts, for example a one-day fast. This helps develop control over appetite and allows the body to adapt.
After practising one-day fasting regularly for approximately 2 – 3 months, one may move on to 2 – 3 day fasts. Only after these are well tolerated and no major difficulties related to hunger arise should longer fasting periods be considered.
This gradual approach helps the body adapt and makes it easier to control appetite after fasting.
There are situations in which some individuals, without prior experience, attempt directly longer fasts of 7 – 10 days. Even if they succeed in completing this period, refeeding may become difficult due to increased appetite. In such cases, the benefits obtained during fasting may be diminished by subsequent overeating.
Establishing a clear purpose
Another important rule is the correct attitude toward fasting. It is useful to prepare in advance and plan the duration of the fasting period. It is important to clearly understand the reason for fasting. When motivation is well defined, control over eating after fasting becomes easier.
If the objective is unclear or insufficiently motivating, it may be difficult to maintain dietary discipline after fasting.
Simple and useful recommendations
When breaking the fast and during the refeeding period, try to chew food thoroughly. Slow and careful chewing contributes to the earlier onset of satiety.
A traditional rule states that solid foods should be chewed until they become almost liquid, and liquids should be held for a few moments in the mouth before swallowing. This prolonged chewing supports digestion and helps prevent overeating.
If there is still a tendency to eat more after fasting, it is recommended to consume mainly fruits and vegetables, which have lower caloric density and are easier to digest.
It is important to remember that overeating after fasting is usually a temporary phenomenon. As experience in fasting is gained, appetite becomes easier to control and the refeeding period easier to manage.
For the proper conduct of water fasting, it is important to maintain an adequate hydration regimen. The required amount of water may vary depending on several factors, such as the duration of the fast, body weight, level of physical activity, environmental temperature, and the experience of the person fasting.
For those who are beginning to practise fasting, the following general guidelines may be considered.
24 – 36-hour fast
In the case of short fasts of approximately 24 – 36 hours, a daily intake of about 1.5 – 2 litres of water is generally recommended. Adequate hydration may contribute to maintaining comfort and normal bodily function during this period.
Such short fasts are sometimes used to reduce food intake or to provide the digestive system with a period of rest, and sufficient water consumption helps maintain fluid balance.
3 – 4-day fast
In the case of fasts lasting 3 – 4 days, the recommended amount of water generally remains around 1.5 – 2 litres per day, depending on individual needs. Adequate hydration may help make the fasting period easier to tolerate.
Longer fasts (7 – 10 days)
In longer fasts of 7 – 10 days, most individuals typically consume approximately 1 – 2 litres of water per day, adjusting the amount according to thirst and general condition.
As a person gains experience in fasting, they may learn to better adapt their hydration regimen according to their own needs.
Adapting water intake
The safest way to determine the appropriate amount of water is to listen to the body’s needs. The sensation of thirst is an important indicator.
Another useful indicator is the colour of urine:
- if urine is light in colour, hydration is usually adequate;
- if urine is very concentrated or dark, an increase in fluid intake may be necessary.
Important observations
Excessive water consumption is not recommended, as it may lead to electrolyte imbalance and unnecessary discomfort. On the other hand, insufficient hydration may affect tolerance to fasting and overall condition.
For this reason, water intake should be balanced and adapted to individual needs.
The basic rules regarding water consumption during fasting do not differ significantly from those applicable in daily life. However, during fasting, water becomes practically the only substance ingested, replacing regular meals. For this reason, the quality of water deserves greater attention.
There are many types of drinking water: spring water, filtered tap water, mineral water, or bottled water. In practice, during fasting, several simple criteria regarding water quality are important.
- Water should be clean
During fasting, the body adapts its metabolism to the absence of food intake, and maintaining proper hydration is essential for normal functioning.
It is therefore recommended to consume good-quality drinking water, free from impurities or contaminants. This may include:
- filtered drinking water;
- high-quality bottled water;
- water from safe sources (for example, verified springs).
If tap water is used, it is recommended to filter it, and in some cases it may also be boiled before consumption.
- Water should preferably have moderate mineral content
Drinking water naturally contains various mineral salts. During fasting, water with low or moderate mineralisation is generally preferable, as highly mineralised water may be more difficult to tolerate in larger quantities.
For this reason, many people prefer:
- spring water;
- table water or still water with low mineral content.
- Water should be pleasant in taste
During fasting, changes in taste perception may occur. Water that was previously well tolerated may become less pleasant.
For this reason, it is useful to choose water that is pleasant to drink, as this helps maintain adequate hydration. Some people prefer water at room temperature, others slightly cooled or boiled and cooled water.
Water temperature
In general, it is recommended that water consumed during fasting should not be very cold. Extremely cold water may cause gastric discomfort or digestive spasms in some individuals. Water at room temperature or slightly warm is usually better tolerated.
Most specialists in therapeutic fasting recommend maintaining adequate hydration during fasting. However, in some cases, the body may reject water or the person fasting may develop a temporary aversion to fluids. This phenomenon occurs especially in beginners and may cause discomfort or concern.
It is useful to understand some possible causes.
Water quality or temperature
Water normally consumed may become harder to tolerate during fasting. Taste perception may change, and the body may become more sensitive to smell or taste.
In such cases, one may try changing the type or temperature of water. Some individuals tolerate better:
- spring water or high-quality bottled water;
- filtered or boiled and cooled water;
- water at room temperature or slightly warm.
Often, simply changing the type of water resolves the issue.
Adaptation in the first days of fasting
During the first 2 – 3 days, the body undergoes metabolic adaptation. During this stage, unusual sensations may appear, including reduced thirst or slight aversion to water.
These manifestations are usually temporary and disappear as the body adapts. Even in such situations, it is recommended to consume small but regular amounts of water.
Digestive discomfort
Symptoms such as nausea or heartburn may occur, especially in the first days. These may be related to gastric secretion or digestive adaptation.
In such cases, small amounts of water consumed at regular intervals may be better tolerated. If symptoms persist or intensify, fasting should be stopped and a specialist consulted.
When to stop fasting
If water aversion is persistent and accompanied by:
- severe nausea;
- repeated vomiting;
- pronounced weakness;
it is recommended to stop fasting and seek specialist advice.
Approximate weight loss during water fasting
Ritmul de scădere în greutate poate varia de la o persoană la alta, în funcție de greutatea inițială, metabolism și nivelul de activitate fizică. În mod orientativ, se pot observa următoarele valori:
- first 1 – 7 days: approximately 0.5 – 1 kg per day
- days 7 – 10: approximately 400 – 500 g per day
- after 10 days: approximately 300 – 350 g per day
It should be noted that initial weight loss is partly due to loss of water and glycogen, and later the rate decreases.
Physical Activity During Fasting
A frequent question related to therapeutic fasting concerns the level of physical activity recommended during this period.
The classical authors who studied fasting had different opinions in this regard.
For example, Herbert Shelton, an American author known for his works on fasting, recommended reducing physical activity during fasting. He considered that the body must concentrate its resources on metabolic adaptation to the absence of food, and that unnecessary energy expenditure could hinder this process.
On the other hand, the Russian physician Yuri Nikolaev, who studied therapeutic fasting in a clinical context, recommended moderate physical activity in the open air. In his practice, patients were encouraged to take daily walks, sometimes even several kilometres long. The idea was that moderate movement can stimulate circulation and contribute to maintaining psychological and physical tone during fasting.
Other authors have also supported the idea that moderate physical activity can be beneficial, as it contributes to maintaining a good general condition and to the body’s adaptation to the metabolic changes that occur during fasting.
A balanced approach is proposed by Paul Bragg, who recommended careful observation of one’s own condition and maintaining moderate physical activity, preferably outdoors.
Practical recommendations
For individuals who are beginning to practise fasting, it is prudent to adopt a reduced level of physical activity. Daily walks in the open air, of approximately 30 minutes or more, are usually appropriate, depending on the general condition.
It is important during this period to monitor your health status. At the beginning of fasting, symptoms such as dizziness or weakness may sometimes occur, which is why physical activity should be performed with caution.
As the body becomes accustomed to fasting, the level of physical activity may be gradually increased. Activities that may be included are:
- walking
- light swimming
- stretching exercises
- light gymnastics
- moderate outdoor physical activities
By contrast, intense physical activity or demanding sports competitions are not recommended during prolonged fasting.
Adapting physical activity depending on fasting duration
During the first 1 – 2 days of fasting, most individuals can carry out their usual activities without major difficulties.
Between days 3 and 5, the body goes through a period of metabolic adaptation. During this interval, some individuals may feel fatigue or a temporary decrease in energy, which is why physical activity should be reduced. Light outdoor walks, however, remain beneficial.
In longer fasts, of 7 – 10 days, many metabolic processes gradually slow down, and physical activity should remain moderate. Excessive effort may lead to pronounced fatigue or muscular discomfort.
Purpose of fasting and physical activity
The level of physical activity also depends on the purpose for which fasting is practised.
If fasting is used for maintaining health or balancing lifestyle, moderate activities such as walking, light swimming, gymnastics exercises, or outdoor activities may be compatible with fasting, provided they do not cause excessive fatigue.
If fasting is practised as part of a therapeutic approach for certain conditions, physical activity should be limited and adapted to the person’s general condition.
Individual factors
Individual characteristics must also be taken into account, such as:
- initial body weight
- age
- sex
- level of physical fitness
- existing medical conditions
Conclusion: fasting and physical activity are compatible, provided that the level of effort is moderate and adapted to the individual condition of the body.
Low body weight can be a problem for some individuals, just as obesity is a problem for others. In some cases, underweight individuals encounter difficulties in gaining weight through conventional dietary methods.
In the experience of some practitioners of therapeutic fasting, it has been observed that, in certain individuals with low body weight, a normalisation of body weight may occur over time after repeated periods of fasting followed by appropriate nutrition. This is explained by the fact that fasting may influence metabolism and may contribute to the regulation of digestive functions.
In certain cases, after the fasting period and the reintroduction of food, the body may absorb and utilise nutrients more efficiently. Changes in metabolic and hormonal regulation may also occur, influencing the body’s energy balance.
Duration of fasting in underweight individuals
In general, individuals with low body weight must approach fasting with great caution. Short or moderate fasting periods are usually preferred, for example 7 – 10 days, followed by an adequate recovery period.
Very long fasts are not recommended for underweight individuals, as they may lead to further loss of body mass.
Gradual approach
As in other situations, fasting should be approached gradually:
- one may begin with one-day fasts;
- then proceed to 2 – 3 day fasts;
- and later, if the body tolerates these stages well, longer periods may be attempted.
Importance of the recovery period
The recovery period is just as important as the fasting period. For a fast of 5 – 10 days, the recovery phase should last at least several weeks, during which food is gradually reintroduced.
During this stage, a balanced diet is recommended, including:
- fresh fruits and vegetables
- adequate sources of protein;
- whole foods.
In underweight individuals, protein and caloric intake should be increased progressively to support recovery.
Consolidation of results
In some cases, normalisation of body weight occurs after several fasting cycles followed by proper nutritional recovery. For this reason, some programmes recommend repeating moderate fasting periods at intervals of several months, with careful monitoring of general condition.
Physical activity during recovery
During the recovery period after fasting, moderate physical activities may be beneficial, such as:
- walking in the open air;
- swimming;
- light physical exercises;
- massage.
These may help improve muscle tone and restore the body to an optimal level of functioning.
Sometimes, especially after a first fasting experience longer than 5 days, oedema may occur during the refeeding period. This phenomenon manifests as temporary fluid retention in the body and may include:
- decreased urine output;
- an increase in body weight of approximately 1 – 2 kg over a short period;
- swelling of the eyelids;
- oedema of the lower limbs.
In short fasts of 2 – 3 days, such manifestations are rare, as the body does not undergo significant metabolic changes.
In longer fasts of 5 – 7 days or more, the body undergoes more pronounced metabolic adaptations. One of these is a change in hydroelectrolytic balance, especially in the ratio between sodium and potassium.
The role of sodium and potassium
During fasting, the body may lose some electrolytes, including sodium and potassium. Upon reintroducing food, if foods rich in salt are suddenly consumed, water retention in tissues may occur, favouring the appearance of oedema.
For this reason, during the refeeding period, it is recommended to gradually reintroduce salt, avoiding large amounts in the first days.
Adaptation during recovery
During the recovery period, the body gradually restores its metabolic balance and hydroelectrolytic equilibrium. Fluid retention is usually temporary and disappears as normal eating patterns are resumed.
Other contributing factors
Oedema may also be influenced by:
- rapid reintroduction of a diet rich in salt or carbohydrates;
- pre-existing chronic conditions;
- excessive physical effort during or immediately after fasting.
For this reason, refeeding should be gradual and balanced, and physical activity should be adapted to the general condition.
To reduce the risk of oedema during the refeeding period, several simple principles are recommended:
– gradual increase in fasting duration, starting with short periods and progressing toward longer ones;
– avoiding prolonged fasting without supervision, especially in inexperienced individuals or those with pre-existing conditions;
– maintaining moderate physical activity during fasting, avoiding intense effort;
– if enemas are used, they should be performed with plain water or specialist-recommended solutions;
– gradual reintroduction of salt after fasting.
In the first days of refeeding, it is preferable to avoid very salty foods or excessive salt intake. As a general rule, for fasts of about 6 – 7 days, salt may be gradually reintroduced after approximately one week; for longer fasts, after a longer recovery period.These measures help the body gradually restore hydroelectrolytic balance and reduce the risk of fluid retention.
These measures help the body gradually restore hydroelectrolytic balance and reduce the risk of fluid retention.
If oedema or fluid retention occurs during refeeding, in most cases it is temporary and disappears as the body restores its hydroelectrolytic balance.
A possible factor is an imbalance between sodium and potassium.
In such cases, the following measures may be useful:
- gradual increase in potassium-rich foods;
- consumption of raisins, dried apricots, fresh apricots, or compotes;
- maintaining adequate hydration and temporary avoidance of very salty foods.
In some cases, potassium supplements may be recommended by a physician, but these should only be used under specialist supervision.
Usually, after a few days of balanced nutrition, oedema gradually decreases and diuresis returns to normal.
During pregnancy, prolonged fasting is considered contraindicated.
This is because the body undergoes important physiological changes, and fetal development depends on an adequate intake of nutrients, energy, and fluids. Therefore, practices involving significant dietary restriction are not recommended.
Especially in early pregnancy, it is advisable to avoid anything that may disturb metabolic balance.
For these reasons, therapeutic fasting is not indicated during pregnancy. If fasting is desired for health reasons, it should be practised before pregnancy or after breastfeeding, not during pregnancy.
During pregnancy, the priority should be a balanced diet appropriate to the needs of both mother and child.
In modern life, many people drive daily.
During the first fasting experience, symptoms such as headaches, weakness, dizziness, irritability, reduced concentration, or fatigue may occur. In such a state, driving may become risky. This is especially relevant in dry fasting, even if short.
With experience, the body may adapt better, and some individuals may drive without difficulty during short fasts if they feel well.
However, longer fasts may affect concentration and reaction time. Driving may become dangerous, especially if dizziness or weakness occurs.
Traffic laws also require that drivers must not operate a vehicle if their physical or mental condition affects safety.
For longer fasts, it is recommended to avoid driving, especially for beginners.
Additionally, acetone breath during fasting may interfere with some breathalyser devices, potentially requiring further verification.
Conclusion: during prolonged fasting, driving should be avoided, prioritising safety.
During prolonged fasting, sexual activity is generally not recommended for several reasons.
One reason is energy conservation. During fasting, the body uses internal reserves to maintain vital functions.
In spiritual fasting, abstinence is also associated with focus on inner life.
Additionally, metabolic changes may cause changes in body odour, which may create discomfort.
In longer fasts (over 7 – 10 days), a temporary decrease in libido is often observed.
Conclusion: although not absolutely prohibited, limiting sexual activity is commonly recommended during prolonged fasting.
One characteristic of fasting is the mobilisation and elimination of metabolic by-products resulting from the breakdown of energy reserves. These substances temporarily enter the blood, lymph, and extracellular fluids and are eliminated through natural excretory mechanisms.
Elimination occurs through:
– kidneys (urine);
– lungs (respiration);
– digestive tract;
– skin (sweating).
The skin is an important organ for elimination and thermoregulation. Its surface is approximately 1.5 – 2.0 m², representing about 15 – 16% of body weight. Sweat glands contribute to the elimination of water and certain metabolic products.
Under normal conditions, the amount of sweat eliminated can vary significantly, depending on temperature and physical activity.
During fasting, intense physical activity is often limited, so other methods may be used to stimulate sweating.
One such method is the steam bath or sauna.
Sauna or bathing may contribute to:
- muscle relaxation;
- stimulation of peripheral circulation;
- increased sweating;
- improved general wellbeing.
During sauna use, body temperature rises moderately, circulation increases, and sweating becomes more intense. These processes may contribute to the elimination of metabolic products and create a sensation of lightness.
Before analysing the role of bathing during fasting, it is useful to understand the types of such procedures.
During fasting, the wet sauna (steam bath) is generally preferred, as it places less strain on the body and is better tolerated than dry sauna.