What are the rules of fasting? Complete guide

The answer depends on many factors: how well you know your body and how well you are prepared for fasting, and what type of fasting it is. Knowledge is the key. So let’s dive in! If you do not know exactly what fasting is and how it works, visit this page first, where you can find all the necessary information about it: __

If you immerse yourself in ancient healing traditions, study forgotten manuscripts, and explore the work of physicians and healers from centuries past, one message appears again and again:

Fasting is one of the oldest healing practices known to humanity.

In ancient times, there were no hospitals, no blood tests, and certainly no doctors dispensing pills. People relied on nature, intuition, and discipline. One of the greatest fasting experts, G.A. Voitovich (PhD in Medicine and creator of the fractional therapeutic fasting method), once said:

Ancient civilizations didn’t have hospitals. That’s why all healing methods, including fasting, were practiced at home.

In principle, human beings can learn a great deal about fasting by studying nature, traditional practices, physiology, and the experiences of those who have walked the path before them.

However, prolonged fasting is governed by deeper realities, not philosophy alone. Understanding the principles of fasting, metabolism, adaptation, and recovery is essential. The deeper one’s knowledge, the better equipped one becomes to make informed decisions, recognize limitations, and approach fasting with respect rather than guesswork.

Ancient traditions may provide the map, and modern science may illuminate parts of the terrain, but the journey itself is guided by the laws of physiology and energy itself. Ignoring those laws comes at a cost.

This post will walk you step by step through the real rules of fasting. Yes, science is important. But in my experience, the best insights come from the ones who’ve faced the hunger, gone deep, and healed for real – practitioners, integrative doctors, mentors. I’ll give you both the research and the real-life methods from mentors and practitioners, so you can stop guessing and start fasting with clarity and confidence.

If you are familiar with terms and ideas, then this is the complete guide you can find online. Prepare for the raw truth — no sentimentality. So here we come to the main rules:

Rule # 1: Start small.

Know your limits.

If you’re just beginning your journey into health, healing, and inner clarity, rule number one is simple:

Start small. Start smart.

Your body is not just a machine. It’s a magnificent, intelligent system — like a giant ship sailing across the ocean. But here’s the truth about massive ships: you can’t make sharp turns instantly. Try to turn too fast, and you risk breaking the vessel or losing control. The same goes for your body. Especially if you live in the modern Western world, your system is likely burdened with a silent accumulation of internal waste. Most people carry years of invisible toxicity — from what they eat, breathe, apply to their skin, or live around.

POPs (Persistent Organic Pollutants)

PCBs (Polychlorinated Biphenyls, found in plastics and packaging)

Heavy metals from water, cosmetics, and industrial air

Mold toxins, microplastics, pharmaceuticals… and the list goes on.

These toxins often remain stored in our fat, joints, and tissues for years, sealed away like time bombs. Once they enter the body, they tend to accumulate and can remain there for years, slowly affecting your organs, hormones, brain, and detox systems. When you suddenly begin an intense fasting protocol without preparation, you risk releasing them all at once. If your liver, kidneys, and lymphatic system aren’t ready to handle this toxic load, this can overwhelm your system and cause damage, not from the fasting itself, but from the toxic flood it unleashes. It’s like flooding your ship’s engine room. You’ll sink, not sail. This is why starting slow and supporting detox organs is absolutely critical.

About Intermittent Fasting

The safest, most sustainable way to begin is with Intermittent Fasting (IF) — and it’s much more versatile than people think. Intermittent Fasting (IF) is not a diet — it’s a natural eating pattern that cycles between periods of eating and fasting.

⏱ Most common types of intermittent fasting:

1. 14:10 — Fast for 14 hours, eat within 10. Slightly deeper results.
2. 16:8 — The most popular style: eat within 8 hours, fast for 16.
3. OMAD (One Meal A Day) — Advanced. A single meal in 24 hours.
4. 5:2 — Eat normally 5 days/week, restrict calories (or fast) for 2 days.

According to fasting healers like Dr. Marva Ohanyan and Slavic experts and practitioners, even gentle intermittent fasting activates your body’s inner doctor. In Slavic and Vedic traditions, short fasts aligned with the moon or seasons were considered sacred for restoring balance. As a fasting mentor with a ground knowledge in nutrition and naturopathy, I can assure you that all protocols — the Christian fast, Ramadan, and others — are deeply connected not only to the lunar cycles but also to seasonal rhythms, circadian biology, and ancient spiritual traditions. These fasts often align with phases of the moon, solstices, equinoxes, and natural cycles of light and darkness, helping to synchronize the body’s internal clock, promote detoxification, and deepen spiritual awareness.

Don’t jump into extended fasts without deep knowledge and preparation. Start where your body feels safe.

If you’d like to learn more about the intermittent fasting method, precautions, and variety of styles, here you will find your Full Guide: The Intermittent Fasting Full Guide

Rule #2: Before You Fast, Know Your Medical Status and Risks

Fasting is not recommended for people with these conditions, according to both Western medical guidelines and traditional Eastern healing practices.

Here’s the list:

1. Dementia
2. Severe forms of blood cancers
3. Advanced tuberculosis
4. Second half of pregnancy & breastfeeding period
5. Severe systemic connective tissue diseases
6. Late-stage cancer (yes, everything has a limit — that’s why you should start fasting before things get critical)
7. Severe anemia
8. Certain mental disorders (anorexia, bulimia, psychosis, very deep depression)
9. Chronic Kidney Disease
10. Serious infections inside the body that lead to pus formation or tissue death, such as abscesses or gangrene.
11. Type 1 Diabetes

Can Fasting Help with Diabetes?

As you may have noticed, Type 2 diabetes is not listed among the conditions I mentioned earlier, and I only referenced a select few mental disorders, not all. Many of these conditions were successfully treated during Soviet times. Unfortunately, much of that research was never indexed in major Western databases like PubMed and remains archived in hospital records, largely inaccessible to the wider medical community.

I believe people deserve to know that some diseases often labeled as incurable, in fact, can be healed, such as type 2 diabetes. There is solid evidence to support this. All of the cases happened in the East. If you have any doubts or wish to explore further, I invite you to visit the dedicated section of my Fasting Lab, where I share detailed protocols, names of pioneering doctors, their books, and clinics. All of them are located outside the Western medical system.

Western medicine often cautions against fasting for diabetes, mainly due to safety concerns and limited practitioner training. But emerging research, along with centuries of Eastern healing traditions, suggests that certain fasting protocols may support metabolic health and even improve Type 2 diabetes outcomes. When done with proper guidance and physiological understanding, fasting becomes a therapeutic tool worth exploring.

I’ve broken down the science, Eastern wisdom, and real protocols here.

Rule #3: Don’t Overload Your Body When Breaking Fast

Breaking a fast is a delicate process that requires patience and care. Overloading your body with heavy or large meals immediately after fasting can cause digestive distress, disrupt gut balance, and put unnecessary stress on your organs. To support your body’s natural recovery and maximize the benefits of fasting, always reintroduce food gradually, starting with light, easily digestible options.

If you’re practicing intermittent fasting, the rules are somewhat milder, but it’s still best to avoid starting the next day with heavy, fried, processed foods or a large piece of meat. Choosing gentle foods helps maintain digestive harmony and keeps you feeling energized.

This mindful approach ensures a smoother transition back to regular eating and preserves your health and energy.

Academician Alexander Mikhailovich Ugolev (an outstanding scientist and organizer of science, Soviet physiologist known for his groundbreaking work on “parietal” or “contact” membrane digestion) thoroughly discusses nutrition and fasting, including the importance of light food before and after fasting, in his key works:

1. “Theory of Adequate Nutrition and Trophology” — Ugolev’s main work, where he presents the fundamentals of proper nutrition, the role of digestive enzymes, and the necessity of gradually transitioning to food after a period of abstinence.
2. “Problems of Trophology and Adequate Nutrition” — In this book, Ugolev discusses the effects of different types of food on the body, including the impact of thermally processed products and principles of restoring the body after fasting.
3. “Fundamentals of Trophology” — a book where the academician details the digestive processes, gut microbiota, and the importance of proper nutrition when preparing for and breaking a fast.

Much of what we understand about digestive adaptation — including pancreatic function and how it relates to metabolism — builds on the pioneering work of Academician A.M. Ugolev, who introduced the concept of membrane digestion. His research laid the groundwork for understanding how the pancreas responds post-meal, which is deeply relevant to managing conditions like Type 2 diabetes. (See Ugolev’s legacy reviewed here.)

Whether you’re practicing intermittent fasting or prolonged fasting, the key is to avoid shocking your digestive system with heavy, greasy, processed, or animal-based foods. To ease your body back into digestion, follow these simple steps:

• Start with hydration — water, herbal tea, lemon water, or raw juices.
• Prefer whole, natural, and living foods like fruits, vegetables, and fermented items.
• No sugar bombs — avoid sweets and refined carbs at the first bite.

For detailed guidance on the best foods to start with, explore the dedicated section in my Lab focused on your specific fasting method, where you’ll find tailored advice and deeper insights. -> Types of Fasting.

Rule #4: Always listen to your body

Always listen to your body. If you start feeling really unwell while fasting on your own, it’s time to break the fast.

During prolonged fasting, many effects can occur. Health may temporarily worsen (this is called a crisis), including strong pain, blood pressure changes, dizziness, skin rashes, and a very rapid heartbeat (this is called tachycardia). However, as an experienced mentor, I can distinguish between pain that, although intense, is part of the healing process, and pain that signals a serious problem. In other words, yes, pain does occur during prolonged fasting.
It’s not all peaceful meditations and glowing skin. For those of us who’ve walked the deeper path, discomfort becomes a signal, a whisper that the inner hero (immune system and higher intelligence in you) has entered the battlefield, repairing, recalibrating, and reviving the body from the inside out.

But let me be clear:
I’m not sharing this to glorify suffering or encourage you to push blindly through pain. Quite the opposite. Most people in the West simply haven’t been taught how to understand or interpret what’s happening. Without guidance or deep knowledge, this practice can become dangerous — even damaging.

I’m sharing this so you can touch the mystery, to know what’s possible when fasting is done with intention, wisdom, and ancient understanding. What I reveal is not a suggestion to go it alone, but an invitation to expand your perception. If you’re curious to peek behind the curtain and explore my personal fasting practices, you’ll find them shared in detail here — but only if you’re truly ready. This path isn’t for everyone.

People who practice these methods understand the difference between a crisis (called acidosis crisis) and intoxication.

But I must emphasize: such practices should never be done alone. They are real and can powerfully heal not only the body but also other layers and aspects of your “Self” that are beyond the material. However, without proper expertise and guidance, such fasting practices can lead to serious adverse effects and potentially dangerous health outcomes.

Of course, if you really want to explore, you can find Eastern literature on the topic, but it requires deep digging, strong logic, and language skills.

Rule #5: Tame the Monkey Mind Before You Ditch the Fork

When someone asks me what the secret is to the miracles I do. This is not a miracle but work on myself. I won’t stop repeating this:

Fasting is a full-blown mental reprogramming. Prepare your mind like a monk, so you can fast like a master.

Your brain has to fast before your body does. If you do not want to damage your body, train your brain to fast first.

Fasting begins in the mind. Neuroscience now confirms what monks and mystics have practiced for centuries: your mental state can influence how your body responds to fasting. Entering a fast in a state of stress, anxiety, or confusion can trigger the sympathetic nervous system (fight-or-flight), impairing digestion, detoxification, and even immune function. These are all key players during fasting.

Scientific Insight:

• A 2016 study published in Cell Metabolism [Longo & Panda, 2016] highlighted that psychological readiness and circadian rhythm alignment significantly impact how fasting affects metabolic pathways, autophagy, and hormonal balance.
• The hypothalamus, a brain region responsible for regulating hunger and homeostasis, is sensitive to mental cues and emotional stress. Chronic stress can dysregulate the HPA axis, making fasting more difficult and less effective (Ulrich-Lai & Herman, 2009).
• Research from Frontiers in Human Neuroscience (2018) has shown that mindfulness and meditation prior to dietary changes improve adherence, stress response, and biochemical markers such as cortisol and insulin sensitivity (Daubenmier et al., 2016).

Eastern approach:

For centuries, Eastern traditions like Shen Gong meditation and Tibetan monk practices have emphasized that fasting is as much a mental and spiritual journey as a physical one. Monks teach that the brain must be “calmed and prepared” to enter a fasting state effectively — that is, cultivating stillness, focus, and detachment to allow the body’s natural healing mechanisms to fully engage.

According to these traditions, an unsettled mind causes “energy blockages” and weakens the flow of Qi (life force), which disrupts the balance necessary for detoxification and regeneration during fasting. Preparing the mind through meditation, breathing exercises, and focused intention “unlocks” this flow and harmonizes the body-mind connection.

The Bottom Line:
If your brain is in survival mode, your body will be too. Start by calming the nervous system through meditation, breathwork, or simply setting an intention, and you’ll activate the parasympathetic “rest-and-digest” mode. This primes your organs for repair and enhances the deep healing that fasting was meant to bring.

Rule #6: Sugar is your enemy

Let’s dive into the biohacking trick. If you try to fast for a short time but your animal instincts to eat knock you off your feet, the first thing you need to do is read what I’m writing here. Do this and you greatly promote your chances of going through intermittent or 24-hour fasting:

Before you dive into fasting like a Zen warrior, there’s one crucial trick: cut the sugar. Not just the refined kind, but all sugars. Fruits. Honey. Coconut nectar. Your grandma’s jam. Even “healthy” sugar sneaks in like a Trojan horse. Remember:

The smoother your fasting ride, the less sugar your body had before.

Most people crash and burn in their first 24 hours, not because they’re “weak”, but because they were running on rocket fuel (glucose) and suddenly pulled the plug.

Why Sugar Makes Fasting Harder

When you consume sugar (natural or artificial), your body ramps up insulin production. That’s your “storage hormone,” signaling your cells to absorb glucose and stash fat. Your body then becomes addicted to that quick energy hit. The more sugar you’ve eaten before fasting, the more intense the glycogen withdrawal and hormonal chaos when you stop.

Then you would ask me, “What about pasta? Bread?”. It is also sugar, a little slow, but sugar anyway. Pasta is mainly made of starch, which is a complex carbohydrate, not sugar per se, but your body breaks it down into glucose (a type of sugar) during digestion. So, pasta does raise your blood sugar, but more slowly than pure sugar or honey. For fasting prep, it’s best to reduce all high-carb foods that cause insulin spikes, including pasta, bread, rice, and obviously sugary stuff like honey, candy, and soda. (Sounds like a lot? If you can’t imagine eating without them, that just shows how unhealthy your usual diet is.)

For fasting prep, it’s best to reduce all high-carb foods that cause insulin spikes, including pasta, bread, rice, and obviously sugary stuff like honey, candy, and soda.

• The liver stores about 100g of glycogen, and muscles store 300–400g. Once that’s gone (within 24–36 hours of fasting), your body panics. If it’s not used to fat-burning (aka ketosis), it cries for sugar.
• Cue: Headaches, irritability, dizziness. Aka “hangry zombie mode.”

A 2018 study in Frontiers in Neuroscience showed that frequent sugar consumption alters dopamine pathways and mimics drug-like withdrawal symptoms during removal, which is exactly what happens in the first phase of fasting.
(Rogers, P.J., et al. 2018)

Why This Trick is Magic

When your insulin is low, and glycogen stores are gently drained beforehand, the fasting state feels surprisingly peaceful. No mood swings. No fight-or-flight. Just glide into ketosis like a quiet engine hum.

I’ve done everything from 24-hour dry fasts to prolonged strict ones, and I’ll tell you this:
Cutting sugar before a fast is like oiling your spaceship before liftoff. Amazing results!

And one more crucial note: never, ever break a fast with sugars, even natural ones like fruit juices. That’s a major mistake that can cause real harm.

Rule #7 Don’t Pollute the Temple You Just Cleansed

The Quantum Code of Nourishment

A piece of food is an informational and energetic field that carries its quantum signature in its essence. Everything in our world is information. It’s encoded in water, in a celery stalk, even in a seemingly innocent broth. And that information can be harmonious or distorted, life-giving or disruptive.

When we eat, we feed the entire field. When foreign or disruptive substances enter the body, vital energy is redirected to decode, neutralize, and defend against them. This burden becomes even greater when what enters is misaligned with the body’s natural blueprint.

Yes, we’re talking about the quantum level here. And if you are curious enough, here are some quite fascinating studies:

Quantum Consciousness and Water in the Brain

Physicist Valeriy Sbitnev proposed that the brain’s “exclusion zone” water, a structured form of water, facilitates quantum processes contributing to consciousness. His model suggests that hydrogen ions move coherently through this structured water, enabling quantum effects like tunneling and interference, which could play a role in neural processing and information storage.

Ukrainian Contributions: Nikolay Bogolyubov’s Theoretical Foundations

Soviet-Ukrainian physicist Nikolay Bogolyubov made significant contributions to quantum field theory and statistical mechanics. His work laid the groundwork for understanding complex systems and interactions at the quantum level, which are essential for exploring the informational aspects of biological processes.

Quantum Nutrition: Integrating Quantum Biology with Nutrition Science

Emerging research in quantum biology suggests that nutrition encompasses more than biochemical interactions. A study published in PubMed introduces the concept of “quantum nutrition,” proposing that nourishment involves not only macronutrients but also subatomic particles and electromagnetic waveforms. This perspective emphasizes the role of quantum phenomena in biological processes and health.

Japanese Advances in Quantum Life Sciences

Japanese scientists are at the forefront of integrating quantum physics with biological research:

• Hiroshi Yukawa and colleagues at the National Institutes for Quantum Science and Technology are developing quantum life science technologies, including biological nano quantum sensors and quantum-enhanced imaging techniques, to study molecular-level life processes.
• Kenji Ohmori has achieved visualization of atomic and molecular wave interference with unprecedented precision, advancing our understanding of quantum dynamics in biological systems.

These facts should already blow your mind!

These advancements aim to revolutionize our comprehension of living organisms by applying quantum principles to biological contexts. And that’s just the scientific layer I’ve touched on. We haven’t even begun to open the vault of Eastern knowledge. Modern science is merely standing at the foot of a vast Tree of Knowledge — a tree whose roots stretch deep into the ancient soils of the East.

The sages of the East knew. They still know. And if you could glimpse even a fraction of the wisdom they carry, you would be stunned. Because while the West measures particles, the East has long mastered the field.

That is why:

Intermittent fasting, when layered on top of a toxic or highly processed diet, will not produce any miracles.

When you shift your entire approach (your food, your rhythm, your state of being), you won’t believe what your body is capable of. You’ll witness reversals, regeneration, and radiance.

And as for extended fasting.
The food that re-enters the body must be as pure, wild, and uncorrupted as possible. The same goes for water.

But that’s a story for another post.

I’m actively involved in social groups of people who have successfully healed their diabetes and other illnesses through fasting and lifestyle changes. This firsthand experience enriches my guidance, so I hope my information will light up your world by offering both scientific studies and real, practical advice, sometimes even more powerful than theory alone.