Foreword
Fasting is an ancestral practice that, far from being an arbitrary deprivation, is a physiological mechanism deeply rooted in human evolution. For thousands of years, our ancestors alternated between periods of plenty and periods of scarcity: the hunt could fail, the seasons limited access to fruit and grains, and meals were rare but nourishing. Our bodies adapted to this rhythm, developing metabolic strategies capable of sustaining survival in the absence of food. Today, in a world where food is permanently available, this natural function has been largely forgotten. Yet modern research confirms that intermittent and prolonged fasting activate unique regeneration and protection mechanisms.
Dr. Pradip Jamnadas, a cardiologist and teacher, points out that fasting is not a fad but a biological function built into our design. In his words, “you are made to fast.” Clinical studies support this claim: a meta-analysis published in 2025 in Nature Aging showed that intermittent fasting significantly reduces inflammatory markers (IL‑6, TNF‑α) and improves insulin sensitivity. INSERM confirmed in 2026 that twelve weeks of 14/10 fasting lead to a 15% improvement in the HOMA‑IR index, an indicator of insulin resistance.
Beyond metabolism, fasting acts on cellular longevity. After 16 to 24 hours without caloric intake, the body activates autophagy, a cleanup process that recycles the damaged components of cells. This mechanism, recognized by the Nobel Prize in Medicine in 2016 (Yoshinori Ohsumi), is now acknowledged as a pillar of preventing aging and degenerative diseases. After several days of prolonged fasting (3 to 5 days), studies conducted by the University of California showed a massive mobilization of stem cells, promoting tissue regeneration and immune repair.
Fasting is also a powerful tool against visceral obesity, the most dangerous form of excess weight. Unlike subcutaneous fat, the visceral fat surrounding the liver and pancreas is highly inflammatory and toxic. Work by the Mayo Clinic (2024) demonstrated that intermittent fasting preferentially reduces this visceral fat, improving liver function and lowering the risk of steatosis.
But fasting is not limited to biological benefits. It also acts on eating behavior and dependence. Modern foods, rich in sugars and processed fats, hijack our dopaminergic reward center, creating a genuine addiction comparable to that of alcohol or nicotine. Fasting allows a gradual withdrawal: compulsive cravings diminish after a few days, and one’s relationship with food becomes mindful and calm again.
It is nonetheless essential to remember that fasting is not a universal, risk-free practice. People with diabetes on insulin, pregnant women, children and frail individuals must be medically supervised. Studies by the American Heart Association (2024) stress that the long-term cardiovascular benefits still require in-depth research. Fasting must therefore be introduced with caution, following progressive steps: start by reducing meal frequency, cut out snacks, then introduce fasts of 24 to 72 hours, always accompanied by natural, balanced eating during the eating periods.
Ultimately, fasting is a strategy for metabolic health and not just a weight-loss diet. It corrects the disorders linked to the modern lifestyle, reduces inflammation, promotes cellular regeneration and restores the body’s natural capacity to adapt. As Dr. Jamnadas puts it: “If I could put fasting in a pill, I would give it to all my patients.”
The basics of fasting
Fasting is above all a matter of eating rhythm. In modern societies, we have grown used to eating three meals a day, often with snacks in between. This high frequency of caloric intake is a historical anomaly: it overloads our bodies, constantly stimulates insulin and promotes fat storage. Dr. Pradip Jamnadas insists: “Snacking is unnatural. You are not made to eat five times a day.”
Reduce meal frequency
The first step is to limit eating to two meals a day, taken within a six-hour window. This model, called “18/6,” means fasting for 18 hours and eating within 6 hours. In practice, this can mean lunch and dinner, or breakfast and lunch, depending on one’s lifestyle. The key is to observe an extended period without caloric intake, allowing the body to switch to a fat-based metabolism.
Studies confirm the effectiveness of this approach. A systematic review published in 2025 in Nutrients showed that intermittent fasting lowers fasting blood glucose, improves insulin sensitivity and promotes weight loss, even without strict calorie restriction. In 2026, INSERM observed that twelve weeks of 14/10 fasting led to a significant improvement in metabolic markers in prediabetic patients.
Cut out snacks
Snacking is one of the main enemies of metabolism. Every food intake triggers the secretion of insulin, the storage hormone. By multiplying these signals, we prevent the body from accessing its fat reserves. Cutting out snacks reduces the hormonal load and promotes the mobilization of visceral fat.
Understanding hunger
Many people fear that fasting will be unbearable because of hunger. Yet the sensation of hunger is regulated by a hormone called ghrelin, which works in cycles. When it rises, we feel the urge to eat, but it naturally falls again after about an hour. Hunger is therefore never continuous: it appears, then disappears. Understanding this mechanism helps put the discomfort into perspective and makes it easier to hold on.
Transition to ketogenesis
The first hours of fasting draw on the glycogen stores of the liver and muscles. Then the body must activate ketogenesis, that is, the production of ketone bodies from stored fat. This transition can cause symptoms known as the “keto flu” (fatigue, headaches, irritability). That is why it is essential to introduce fasting gradually, starting by reducing meal frequency before attempting prolonged fasts.
Favor natural foods
Even when reducing meal frequency, there is no point filling your plate with industrial products rich in sugars and oxidized fats. Fasting should go hand in hand with simple, natural eating made up of vegetables, fruit, fresh meat or fish, eggs, legumes and quality oils. The goal is not to count calories, but to restore a healthy relationship with food: eat until satisfied, then let the body work for long hours without intake.
Observed benefits
Patients who adopt this rhythm quickly report improvements: lower blood pressure, less joint pain, better sleep and weight loss focused on visceral fat. A Mayo Clinic study (2024) confirmed that intermittent fasting preferentially reduces visceral fat, improving liver function and lowering the risk of steatosis.
In summary, the basics of fasting rest on three pillars:
- Reduce meal frequency (two meals a day).
- Cut out snacks (snacking is unnatural).
- Favor natural foods (avoid processed products).
This first step forms the foundation of a sustainable health strategy. It resets the metabolism, reduces inflammation and prepares the body for the deeper benefits of prolonged fasting.
Metabolism and health
Fasting is not only a spiritual practice or a weight-loss method: it is a genuine tool for metabolic repair. Contemporary research, supported by the clinical experience of Dr. Pradip Jamnadas, shows that intermittent or prolonged food restriction acts on the main disorders linked to the modern lifestyle: insulin resistance, hypertension, hepatic steatosis, visceral obesity and chronic inflammation.
Insulin sensitivity and diabetes
One of the best-documented effects of fasting is improved insulin sensitivity. By reducing meal frequency, we reduce insulin spikes and allow the body to mobilize its fat reserves. An INSERM study (2026) showed that a 14/10 fasting protocol over twelve weeks improves the HOMA‑IR index, an indicator of insulin resistance, by 15%. In prediabetic patients, this improvement reduces the risk of progressing to type 2 diabetes. Dr. Jamnadas stresses that this benefit occurs even without significant weight loss: it is the physiology that corrects itself.
Visceral fat and hepatic steatosis
Fasting preferentially targets visceral fat, the most dangerous kind for health. Unlike subcutaneous fat, the visceral fat surrounding the liver and pancreas is highly inflammatory. It secretes cytokines that disrupt the functioning of organs and promote hepatic steatosis. Work by the Mayo Clinic (2024) confirmed that intermittent fasting significantly reduces this visceral fat, improving liver function and lowering the risk of cirrhosis. Patients often report that their belly shrinks quickly, a sign that deep fat is being mobilized.
Blood pressure and cardiovascular health
Fasting helps lower blood pressure and reduce coronary risk. By decreasing systemic inflammation and improving endothelial function, it slows the progression of atherosclerosis. A meta-analysis published in 2025 in Nature Aging showed an average 22% reduction in inflammatory markers (IL‑6, TNF‑α) among people practicing intermittent fasting. However, the American Heart Association (2024) points out that the long-term cardiovascular benefits still require in-depth studies, particularly for patients who already have coronary artery disease.
Preserving muscle mass
Unlike low-calorie diets spread over many small meals, fasting preserves muscle mass. During prolonged restriction, growth hormone increases, protecting muscle tissue. Dr. Jamnadas insists: “Fasting makes you lose visceral fat, not muscle.” Comparative studies have shown that patients on conventional calorie restriction lose both fat and muscle, while those who practice intermittent fasting better preserve their lean mass.
Inflammation and chronic disease
Chronic inflammation lies at the heart of many modern conditions: osteoarthritis, autoimmune diseases, digestive disorders, depression. Fasting acts as a natural anti-inflammatory. By reducing cytokine production and promoting autophagy, it decreases joint pain, improves mental clarity and reduces digestive symptoms. Several of Dr. Jamnadas’s patients report that their pain disappeared quickly after a few weeks of practice.
Simplicity and effectiveness
Fasting does not require counting calories or following complex diets. It rests on a simple rule: eat less often and eat real food. This simplicity makes it a strategy accessible to everyone, adaptable to different cultures and eating habits. Dr. Jamnadas reminds us that the key is to favor natural, minimally processed foods and to respect periods of metabolic rest.
In summary, fasting acts as a metabolic maintenance program:
- It improves insulin sensitivity and reduces the risk of diabetes.
- It mobilizes visceral fat and protects the liver.
- It lowers blood pressure and reduces inflammation.
- It preserves muscle mass thanks to growth hormone.
Fasting is thus not just a weight-loss tool, but a comprehensive health strategy capable of correcting the disorders linked to the modern lifestyle and restoring physiological balance.
Autophagy and stem cells
Fasting is not limited to a simple reduction in calories: it triggers deep biological mechanisms that literally transform how cells function. Two major phenomena lie at the heart of these benefits: autophagy and the mobilization of stem cells. Together, they form a genuine strategy of regeneration and protection against aging and chronic disease.
Autophagy: cellular cleanup
The term “autophagy” literally means “eating oneself.” It refers to a process by which cells break down and recycle their damaged components: oxidized proteins, defective mitochondria, membrane fragments. This mechanism, discovered and studied by Yoshinori Ohsumi (Nobel Prize in Medicine 2016), is now recognized as a pillar of cellular longevity.
- Activation by fasting: after 16 to 24 hours without caloric intake, autophagy kicks in. It reaches its maximum level after 36 hours of fasting, according to several Japanese and American studies published between 2024 and 2026.
- Beneficial effects: autophagy reduces the accumulation of “cellular waste,” prevents neurodegenerative diseases (Alzheimer’s, Parkinson’s), improves immune function and slows aging.
- Difference from calorie restriction: a low-calorie diet spread over many small meals does not trigger autophagy significantly. Only a prolonged absence of calories, as in intermittent or prolonged fasting, activates this process.
Dr. Jamnadas insists: “After 36 hours, you enter a phase where your body gets rid of senescent cells, those zombie cells that sustain inflammation.” These cells, unable to divide, secrete toxic molecules that disrupt their surroundings. Fasting allows them to be eliminated, thereby reducing chronic inflammation.
Stem cells: regeneration
Beyond cleanup, fasting promotes the mobilization of stem cells, the body’s true “reserves of youth.” After several days of prolonged fasting (3 to 5 days), studies conducted by the University of California showed a significant increase in stem cells circulating in the blood.
- Role of stem cells: they are capable of differentiating into various cell types (muscle, nerve, immune). Their mobilization promotes the repair of damaged tissue and the renewal of organs.
- Observed effects: improved immune function, regeneration of the intestinal mucosa, repair of muscle tissue and a reduction in markers of aging.
- Medical applications: some researchers see fasting as a complement to regenerative therapies, because it naturally stimulates the production of stem cells without outside intervention.
Synergy between autophagy and regeneration
Fasting works in two stages: first cleanup (autophagy), then rebuilding (stem cells). This cycle mirrors that of nature: clearing out the old to make way for the new. In practice, this means the body gets rid of damaged cells, then replaces them with young, functional cells. This dynamic explains why patients report an overall improvement in their vitality after a prolonged fast.
Recent scientific data
- A study published in 2025 in Cell Metabolism showed that three days of prolonged fasting increase the mobilization of hematopoietic stem cells by 30%, strengthening immune function.
- Japanese research (2024) confirmed that autophagy peaks after 36 to 48 hours of fasting, reducing deposits of abnormal proteins in neurons.
- A European meta-analysis (2026) concluded that intermittent fasting significantly reduces markers of cellular senescence, improving longevity.
Precautions
These benefits must not overshadow the necessary precautions. Prolonged fasting should be medically supervised, especially in patients with diabetes or who are frail. Autophagy and stem cell mobilization are powerful processes, but they require the metabolism to adapt gradually. Dr. Jamnadas recommends starting with short fasts (18/6, 24 hours), then gradually extending their length.
In summary, Page 3 shows that fasting is much more than simple food restriction:
- It activates autophagy, a true cellular cleanup mechanism.
- It promotes the disappearance of senescent cells, which are sources of inflammation.
- It stimulates the mobilization of stem cells, allowing tissue regeneration.
- It combines cleanup and rebuilding, offering a natural longevity strategy.
Addiction and modern life
Fasting is not merely a dietary discipline: it also reveals the psychological and behavioral dimension of our relationship with food. In modern societies, food has become a source of dependence, comparable to what is seen with alcohol, nicotine or certain drugs. Dr. Pradip Jamnadas insists on this point: “Our reward centers have been hijacked by industrial foods.” Understanding this mechanism is essential for fasting successfully and regaining a healthy relationship with food.
The dopaminergic reward center
The human brain has a reward system based on dopamine. For millions of years, this system served to encourage the search for calories that were scarce in nature. Finding honey, ripe fruit or a source of protein was an exceptional event, triggering a strong release of dopamine and a feeling of pleasure. This mechanism ensured survival: it drove humans to seek out and eat energy-rich foods whenever they were available.
Today, this system is hijacked by modern foods. Industrial products, rich in fast sugars and processed fats, overstimulate the reward center. The brain receives disproportionate pleasure signals, leading to compulsive eating. It is the same circuit as the one activated by nicotine, alcohol or even heroin. Food dependence is therefore not just a “bad habit,” but a genuine neurobiological addiction.
The symptoms of dependence
Patients who start a fast often describe symptoms resembling withdrawal: trembling, sweating, irritability, irrepressible cravings for sugar or processed products. Dr. Jamnadas explains that these manifestations are not linked to true hypoglycemia, but to a lack of stimulation of the reward center. The body is demanding its “fix” of dopamine. As with alcohol or tobacco, these symptoms disappear after a few days of withdrawal, once the brain regains its balance.
The role of fasting in withdrawal
Fasting acts as a detoxification therapy. By eliminating frequent caloric intake, it forces the brain to readapt. After three to five days, compulsive cravings diminish, hunger becomes more stable and one’s relationship with food is transformed. Dr. Jamnadas compares this process to that of a hospitalized patient with alcoholism: after three days without alcohol, the cravings disappear. In the same way, after a few days of fasting, cravings for sugar or industrial products subside.
Modern life and convenience
Modern society makes food permanently accessible. Supermarkets are overflowing with processed products, available at any hour. Convenience has become a trap: “Conveniently you will die,” Dr. Jamnadas warns. Easy access leads to overconsumption and dependence. Yet modern life can also be an asset: it makes it possible to choose fresh foods consciously, to cook simply and to reintroduce a more natural eating rhythm. The secret is to favor unprocessed products, shop daily in small quantities and avoid the industrial food aisles.
Education and awareness
Successful fasting depends on education and awareness. Understanding that hunger is cyclical, that cravings are linked to dopamine and that withdrawal symptoms are temporary makes it possible to hold on during the first days. Dr. Jamnadas stresses the importance of support: fasting in a group or with a loved one increases the chances of success. Awareness of food addiction turns fasting into a voluntary act of liberation.
Scientific data
- A study published in 2025 in Frontiers in Nutrition showed that intermittent fasting reduces compulsive sugar consumption in 68% of participants after eight weeks.
- Research from the University of Toronto (2024) confirmed that fasting reduces the activity of dopaminergic circuits linked to food reward, reducing addictive behaviors.
- A European meta-analysis (2026) concluded that fasting is associated with improved control over eating and fewer episodes of binge eating.
In summary, Page 4 highlights the psychological dimension of fasting:
- Modern foods hijack our dopaminergic reward center.
- Fasting acts as a withdrawal therapy, reducing compulsive cravings.
- Modern life makes industrial products easily accessible, but it also makes it possible to choose fresh foods consciously.
- Education and social support are essential for a successful transition.
Practical strategy
- To be effective and lasting, fasting must be built into a progressive, tailored strategy. It is not a matter of plunging abruptly into total deprivation, but of preparing body and mind for a new eating rhythm. Dr. Pradip Jamnadas stresses the importance of education and support: “You don’t start a prolonged fast overnight. The metabolism has to readjust step by step.”
Initial stage: reduce meal frequency
The first step is to move from three meals and several snacks to two meals a day, within a six-hour window (18/6 protocol). This transition allows the body to get used to longer periods without caloric intake. Patients quickly report lower blood pressure, better sleep and less joint pain. Clinical studies confirm that this step alone is enough to improve insulin sensitivity and reduce visceral fat.
Intermediate stage: one meal a day (OMAD)
After a month of practicing 18/6, Dr. Jamnadas recommends introducing days with a single meal (OMAD, One Meal A Day), three times a week. This stage intensifies fat mobilization and promotes the production of ketone bodies. Patients can measure their progress with urine test strips that detect ketones. The appearance of ketones is a sign that the body is switching to a fat-based metabolism.
Advanced stage: prolonged fasts
Once the body has adapted, it is possible to introduce prolonged fasts of 24 to 72 hours, or even longer. These fasts trigger maximal autophagy and the mobilization of stem cells. Dr. Jamnadas recommends starting with 24-hour fasts, then gradually extending their length. Patients must stay hydrated (water, tea, black coffee, electrolytes) and avoid any caloric intake. The benefits observed include immune regeneration, a reduction in chronic inflammation and improved vitality.
Eating between fasts
Fasting is no excuse for skipping healthy eating during the eating periods. Dr. Jamnadas insists: “Eat real food, not products.” Meals should be made up of natural foods: vegetables, fruit, fresh meat or fish, eggs, legumes, quality oils. He advises against processed products, refined sugars and industrial vegetable oils. The goal is not to count calories, but to restore a simple, mindful relationship with food.
Support and guidance
Fasting can be difficult at first, notably because of the withdrawal symptoms linked to food addiction. Dr. Jamnadas recommends fasting in a group or with a loved one in order to benefit from moral support. Education is also essential: understanding that hunger is cyclical, that compulsive cravings are temporary and that the benefits appear quickly makes it possible to hold on during the first days.
Medical precautions
Fasting must be supervised in patients with diabetes or hypertension or who are taking medication. Temporarily stopping certain medications may be necessary to avoid hypoglycemia or excessive drops in blood pressure. Pregnant women, children and frail older adults should not undertake prolonged fasts without medical advice. Studies by the American Heart Association (2024) point out that the long-term cardiovascular benefits still require research, which calls for caution and follow-up.
Overall strategy
The practical fasting strategy can be summed up in three stages:
- Adaptation phase: 18/6 for one month.
- Intermediate phase: OMAD three times a week.
- Advanced phase: prolonged fasts of 24 to 72 hours, introduced gradually.
This progression allows the body to adjust, mobilize its fat reserves, activate autophagy and stimulate cellular regeneration. It turns fasting into a genuine metabolic maintenance program, capable of correcting the disorders linked to the modern lifestyle.
In summary, fasting must be built into a progressive strategy:
- Start by reducing meal frequency.
- Introduce days with a single meal.
- Move on to prolonged fasts, under medical supervision.
- Combine fasting with natural eating and social support.
Conclusion
In light of the teachings of Dr. Pradip Jamnadas and contemporary scientific research, fasting emerges as a comprehensive health strategy. It is neither an arbitrary deprivation nor a weight-loss diet, but a return to a biological function written into our evolution. For thousands of years, humans alternated between periods of eating and periods of scarcity; our bodies are designed to benefit from these phases of metabolic rest. In modern society, where food is permanently available and often processed, this natural rhythm has been lost, leading to an explosion of chronic diseases: diabetes, visceral obesity, hypertension, cardiovascular disease, joint disorders and neurodegenerative disorders.
Fasting acts on several complementary levels:
- Metabolic: it improves insulin sensitivity, lowers blood glucose and mobilizes visceral fat, protecting the liver and pancreas.
- Inflammatory: it decreases cytokine production and reduces chronic pain, improving quality of life.
- Cellular: it activates autophagy, the cleanup mechanism for damaged cells, and stimulates the mobilization of stem cells, promoting tissue regeneration.
- Behavioral: it acts as a withdrawal therapy against food addiction, restoring a mindful, calm relationship with food.
These benefits are confirmed by clinical and experimental studies: activation of autophagy after 24 to 36 hours, improved insulin sensitivity after a few weeks of intermittent fasting, a reduction in visceral fat observed on medical imaging, and stem cell mobilization after several days of prolonged fasting. Fasting is thus recognized as a powerful tool for preventing and correcting the disorders linked to the modern lifestyle.
However, it must not be practiced indiscriminately. Patients with diabetes on insulin, pregnant women, children and frail older adults must be medically supervised. Fasting should be introduced gradually: start by reducing meal frequency (18/6), cut out snacks, then introduce days with a single meal (OMAD), before attempting prolonged fasts of 24 to 72 hours. Eating between fasts should remain natural and balanced, made up of fresh, unprocessed products.
Beyond its physiological benefits, fasting carries a message of responsibility and hope. It invites everyone to take their health back into their own hands, to break free from dependence on industrial products and to rediscover the simplicity of mindful eating. It reminds us that vitality, mental clarity and longevity are not the result of artificial supplements, but of natural mechanisms that we can reactivate. As Dr. Jamnadas puts it: “If I could put fasting in a pill, I would give it to all my patients.”
In conclusion, fasting is a universal medicine, accessible, inexpensive and profoundly effective. It corrects the disorders of the modern lifestyle, reduces inflammation, promotes cellular regeneration and restores the body’s natural capacity to adapt. It is not a passing fad, but a return to the essentials: respecting the biological rhythm written into our design. Fasting is a key to health and longevity, a practice that, adopted with caution and perseverance, can transform anyone’s life for the long term.