Most likely, you’ve heard about the miraculous effects of religious fasting on the body and soul. Throughout history, this path of healing and spiritual refinement has remained the shortest and most effective route to transformation. Not only does it mobilize the body’s inner resources, eliminate damaged cells, and rid the system of toxins, directing every reserve toward rehabilitation and healing, but fasting also awakens and develops the innate spiritual capacities within us. Capacities that were granted to humans from the very beginning by God and Nature.
Ἐν ἀρχῇ ἦν ὁ λόγος, καὶ ὁ λόγος ἦν πρὸς τὸν θεόν, καὶ θεὸς ἦν ὁ λόγος.
“In the beginning was the Word, and the Word was with God, and the Word was God.”
John 1:1.
Ancient Greece, through the teachings of Heraclitus (c. 535–475 BCE) and the Stoics; Buddhism, (Dharmakaya); Jewish Kabbalah, creating through the Dabar; Gnosticism; and, of course, one of the oldest surviving texts in Vedas (c. 3000–5000 BCE) and Upanishads, all speak of the same truth: the Logos, the Word, or more precisely, the Mind, was first.
As the eminent scientist Peter Gariaev once said, before the Word, there was Thought. From Thought, our material universe begins to manifest.
Fasting in most religious traditions is not meant as entertainment or pleasure. Its purpose is discipline, reflection, purification, and connection with the divine. The joy should not come from indulgence or fun during the fast itself. The joy comes later, from inner clarity, self-mastery, and spiritual growth,
It’s similar to prayer or meditation: the practice can feel challenging, even uncomfortable, but its value is in the personal and spiritual work it fosters.
From the Hindu practice of Upavāsaa to Lent in Christianity, Ramadan in Islam, and fasting in Buddhism, all these traditions are deeply connected to the cycles of the moon and the rhythms of nature. By observing these natural cycles, we align our body and mind with the larger cosmic patterns, amplifying both the spiritual and physiological benefits of fasting. In this light, fasting is far more than a personal discipline. It becomes a dialogue with the universe itself.
What are the rules of religious fasting?
Religious fasting varies depending on the tradition, but most share the goal of purifying the body, mind, and spirit.
1. Fasting in Christianity
One of the biggest ones is called Lent. Lent (the period of fasting and preparation before Easter) is not originally a “Catholic” holiday. The practice of fasting for 40 days before Easter comes from early Christianity, rooted in both the Old Testament traditions and the life of Jesus (40 days in the wilderness). It predates the division between Eastern Orthodox and Western Christianity.
True Lent, as described in the early Christian tradition, originally reflected the 40-day fast of Jesus in the desert. It is a complete abstinence from all food and, according to many interpretations, likely from liquids as well. It was a full physiological fast of profound spiritual purpose.
What we call “Lent” today is an adaptation, better to say a softened, socially acceptable version created for everyday life. It is a remembrance, not a replication, of what was written. It keeps the symbolism but removes the actual physiological state that Jesus entered. Modern Lent honors the story but no longer mirrors the practice. What is our reality? The raw truth: Jesus fasted. Today we restrict.
Both have value, but they are not the same, neither spiritually nor biologically.
That is why I referenced non-canonical Gospels, such as the Gospel of Thomas, which was discovered in 1945 as part of the Nag Hammadi Library in Egypt. This text, a collection of 114 sayings of Jesus, provides a unique window into early Christian teachings outside the traditional New Testament canon. It contains guidance on fasting and other practices, but these are recommendations or disciplines for spiritual growth.
People often treat fasting like a “magic pill” they apply once in a crisis, for example, after holidays, after stress, after overeating. But true fasting was never meant to be an emergency tool. In every ancient tradition, from Eastern practices to Orthodox Christianity, fasting was woven into the structure of life itself. Weekly rhythms. Seasonal rhythms. Life rhythms. It was the original human reset button.
In Orthodox Christianity, there are multiple fasting periods: besides the Great Lent before Easter, there are the Nativity Fast (Advent), the Apostles’ Fast, the Dormition Fast, as well as regular weekly fasts on Wednesdays and Fridays.
- Most rules:
- Avoid certain foods (meat, dairy, or all animal products on specific days).
- Eat only one or two meals a day in stricter traditions.
- Avoid luxuries, excessive eating, and indulgence.
2. Fasting in Islam
Ramadan fasting (Sawm):
Ramadan is a sacred month in Islam, observed as a time for spiritual reflection, self-discipline, and increased devotion to God (Allah). Fasting cultivates empathy for the poor, patience, and moral self-control. Ramadan is one of the Five Pillars of Islam, essential to Muslim faith and practice. In strict physiological terms, it’s closer to an intermittent fasting pattern shifted to night, which may be suboptimal for organ rest and deep detoxification.
While Ramadan is not a true metabolic fast in the strict sense, it can still be seen as a gentle detox break for the body. There are many types of fasting, and each has different effects on the body and mind. The structured periods of eating and abstinence during Ramadan allow the digestive system to pause for several hours, encourage moderation, and promote awareness of habits. From an alternative health perspective, even this rhythm provides the body with some restorative benefits, especially compared to constant, unrestricted eating in modern life.
- Rules of fasting (Sawm):
- Abstain from food, drink, smoking, and sexual activity from dawn (Fajr) to sunset (Maghrib)
- Eat modestly before dawn (Suhoor) and after sunset (Iftar).
3. Fasting in Judaism
Yom Kippur and other fasts. Yom Kippur, the Day of Atonement, is the most profound example: for about 25 hours, people abstain from food, drink, and other comforts, focusing entirely on prayer, repentance, and reconnecting with God. What’s fascinating is how these practices mirror other religious fasts around the world, from Lent in Christianity to Ramadan in Islam, and Ekadashi in Hinduism. Across cultures, fasting is a tool for clarity, discipline, and spiritual awareness, not just a restriction on eating.
- Rules:
- Abstain from food and drink for 25 hours (Yom Kippur).
- Some fasts are shorter or partial.
- No bathing, wearing leather shoes, or sexual activity on certain fasts.
4. Fasting in Hinduism
Upavasa (उपवास)
Upavāsa is the general term for fasting. It is a practice aimed at spiritual purification, self-discipline, and devotion. Of all the various forms of Upavāsa, the fast most people are familiar with is called Ekadashi, observed on the 11th day of each lunar fortnight. During Ekadashi, devotees abstain from grains and certain foods while spending the day in prayer, meditation, and reading sacred texts, aligning their body and mind with both spiritual and cosmic rhythms.
- Rules vary:
- Some fasts allow only fruits, milk, or specific foods.
- Some fasts involve complete abstinence from food or grains.
- Timing may be specific days of the week or lunar phases.
5. Buddhism
In Buddhism, fasting is about cultivating mindfulness, discipline, and clarity of thought. Monks and practitioners often follow a daily routine of abstaining from solid food after midday, using the time and energy saved to focus on meditation, study, and spiritual practice.
In Buddhism, fasting is a practice of letting go. It is a specific way to detach from desire and the constant pull of bodily cravings, where even food becomes a temptation to overcome. This discipline helps the mind stay clear, alert, and focused. Unlike Hindu or Islamic fasting, it may not follow specific lunar cycles, yet it still aligns the practitioner with the natural rhythms of the body and energy, cultivating awareness, self-control, and a deeper understanding of impermanence.
Some Buddhist monks, particularly those in the Shaolin or Shengong traditions, take fasting to an extraordinary level. They are trained to fast for extended periods, sometimes for years, combining meditation, breathing techniques, and physical conditioning to sustain the body without regular meals. This extreme discipline demonstrates the potential of the mind and spirit to influence the body, a principle that echoes in all religious fasting traditions.
- Rules vary by tradition:
- Theravada monks: No solid food after noon.
- Lay practitioners: May fast on Uposatha days or certain festivals.
Fasting in the Bible
Delving deeper into these teachings, one sees that God is one, but access to divine knowledge is offered in different ways, tailored to different layers of society and levels of human development. All paths lead to Rome, all roads lead to God. Every tradition, in one way or another, points toward the same Source.
Over the millennia, however, information became distorted, especially in the Bible. It was copied and translated countless times, often inaccurately. Every single word carries weight and meaning, and even a small misinterpretation can change the essence of what was said. A single mistranslated word can transform the meaning of Jesus’ teachings entirely.
Fasting is a practice that consistently appears in both canonical and non-canonical texts. It is described in the Bible as a means of purification, spiritual clarity, and drawing closer to God. In the canonical gospels, Jesus himself fasted for 40 days in the wilderness (Matthew 4:2, Luke 4:2), demonstrating self-discipline and spiritual preparation. Fasting is also prescribed in the Old Testament, for example, in Isaiah 58, where it is portrayed not merely as abstention from food but as an act of justice, humility, and devotion.
Beyond the canonical texts, non-canonical gospels also highlight fasting as a spiritual tool. The Gospel of Thomas, for instance, includes sayings that encourage self-denial and fasting as ways to purify the mind and reveal hidden knowledge.
Purpose of fasting
Fasting has a deep spiritual purpose beyond food restriction. While details differ, the essence is remarkably similar across traditions. It is a tool to purify body and soul, develop discipline, and draw closer to the Divine. Through hunger and simplicity, a person learns humility, gains clarity in prayer or meditation, and awakens compassion by feeling what the poor endure. Whether in Christianity, Islam, Judaism, Hinduism, or Buddhism, fasting is seen as a way to renew the spirit and prepare for sacred moments.
Anyone who practices fasting must understand that everything begins with thought. If the practice of fasting is done for a blog, for people on Instagram, for hype, for protests, or for any other events not connected to the purification of one’s own soul in silence and stillness, it is no longer true fasting. Let us turn to a saying of Jesus, which the ordinary reader cannot interpret correctly. Here it is:
If you fast, you will bring sin upon yourselves; and if you pray, you will be condemned; and if you give alms, you will do evil to your souls.
Saying 14 of the Gospel of Thomas
A reader who does not pause to reflect might wonder why Jesus would say such things. This saying highlights the danger inherent in ritualistic practices when they are misunderstood or performed for show.
It is a warning: the intention and comprehension behind every religious act matter far more than the act itself. Any almsgiver who gives for the sake of public recognition, any person who enters a fast to impress followers, gains nothing spiritually and may, in fact, harm themselves in the process. True devotion is invisible, sincere, and arises from the heart, not the applause of others.
That is why you will rarely meet people showing how to undertake prolonged fasting, unless it is documented in a great spiritual book written afterward. There is some evidence on YouTube, and some practitioners do dry fasting and film it for a spiritual purpose, but only for short periods of time. As an experienced fasting mentor, I tell you: when you start practicing seriously, being even five meters away from your computer can make you feel unwell. To fast deeply, you must align yourself with nature, fresh air, and God itself, and nothing else matters.
For those seeking a deeper understanding of this challenge, I highly recommend “Recovering the Original Gospel of Thomas” by April DeConick, a professor of Biblical Studies at Rice University. Her specialty is non-canonical gospels. DeConick immerses herself in anthropological, psychological, social, and historical studies of memory and its formation, helping readers understand how and why these texts were created. For anyone questioning the authority of such works, her analysis is illuminating. Reading her work teaches us how to filter information critically and wisely.
She suggests that as the institutional Church consolidated authority, many writings were rewritten, censored, or modified to align with orthodoxy. This process often involved editing or omitting content that was considered heretical or inconsistent with the emerging orthodox doctrine.
My personal quest for truth has led me to discoveries across cultures. Any seeker will find that it does not matter whether before their eyes lies the Quran, the Upanishads, or the Bible. All these sacred texts share a single origin, and it is God. Some writings are more precise and profound, like the Upanishads; others, like the Bible, have been heavily rewritten and edited over time. Yet the essence remains the same, and these core ideas are present in all of them.
The most important step is to take the first step. Begin the journey, and God will guide you to understanding.
Why should you fast?
In the 10th and 11th centuries, the preeminent philosopher and physician of the Muslim world, Avicenna (Ibn Sina), frequently prescribed fasting to his patients, particularly those suffering from smallpox and syphilis. This is not surprising, as fasting actively purifies the blood. Fasting as a treatment has been successfully practiced throughout history by nearly all cultures.
Katsuzo Nishi, a pioneer of natural medicine, founder of the Nishi Health System, writes in his book The Golden Rules of Health that sources available to us indicate that over 2,000 years ago, this treatment was prescribed by the philosopher Asclepiades of Bithynia.
Plutarch, a Greek philosopher and historian from the 1st century CE, often explored themes of ethics, virtue, and health. In his work De tuenda sanitate (“On Preserving Health”), he emphasized the importance of self-care and moderation in maintaining well-being. One of his notable statements is:
Instead of using medicine, better fast today.
This succinctly captures his belief in the body’s natural ability to heal through practices like fasting. Today, this insight challenges us to move beyond dependence on medicine and to reconnect with natural ways of supporting and restoring our own health.
Paul Bragg, a pioneer of natural health in the early 20th century, emphasized fasting as a powerful tool for physical, mental, and spiritual rejuvenation. In his book The Miracle of Fasting, he states:
Fasting clears away the thousand little things which quickly accumulate and clutter the body, mind and heart. It cuts through corrosion and renews our contract with God and Mother Earth.
Fasting does more than cleanse the body and restore health. It reaches deeply into the mind and nourishes the spirit. When someone practices prolonged fasting, their consciousness changes in such a profound way that old interests, routines, work, and even friendships can suddenly feel dull or confusing. This is not a negative experience. It is a monumental one. With such a deep transformation, life changes in profound ways. Awareness expands, harmful habits fade, social circles shift, and at times, the journey can feel very lonely, but amazing.
This is the true essence of spiritual fasting. Whether it is practiced in the traditions of Lent, other religious fasting, or ancient Vedic disciplines, it is a path of awakening. Much of the world is hidden in illusion, what Vedic culture calls “Maya”, and to pierce through that illusion, practices like fasting and meditation are essential. The path is never easy, but the transformation it brings is unparalleled. It reshapes consciousness, purifies desire, and allows you to see life from an entirely new perspective.
Spiritual preparation before Fast
- Set Clear Intentions
Before embarking on a fast, it’s essential to define your purpose. Everything starts in your mind. Whether seeking physical healing, spiritual clarity, or emotional balance, having a clear intention helps maintain focus and determination throughout the fasting period. - Engage in Meditation and Prayer
Incorporate daily meditation or prayer to center your mind and spirit. This practice fosters inner peace and strengthens the connection between body and soul, preparing you for the challenges of fasting. - Cultivate a Positive Mindset
Approach fasting with a positive attitude. Embrace it as an opportunity for growth and renewal, rather than a deprivation. This mindset can enhance the benefits of fasting and make the experience more rewarding. - Seek Guidance from Spiritual Texts
Study sacred texts or writings that resonate with your spiritual beliefs. Reflecting on passages related to fasting and self-discipline can provide inspiration and deepen your understanding of the practice. - Prepare Your Environment
Create a serene and supportive environment for your fasting period. This may involve decluttering your space, reducing distractions, and surrounding yourself with items that promote tranquility and focus. - Limit Technology and Artificial Devices
During fasting, especially longer than 24 hours, the body becomes highly sensitive and begins a subtle process of reprogramming. For this reason, it is wise to avoid mobile phones, television, and other overstimulating technology. Even the microwave should be set aside. Reducing exposure to these artificial influences allows the body and mind to rest deeply and align with the natural rhythm of fasting.
Spiritual preparation for fasting is as important as the fast itself. Setting intentions, practicing meditation, and creating a supportive environment allow the process to unfold more deeply. But fasting is also a delicate practice, and many people wonder what they should avoid, how to prepare their body and mind, and how to move safely through the experience. If you feel called to begin but have questions or want personal guidance, you can book a one-on-one session with me, where I will share practical steps, answer your concerns, and guide you through the process with clarity and care.
What happens spiritually when you fast?
Religious fasting brings profound changes not only to the physical body but also to the spiritual realm. On a deeper level, it affects consciousness, energy flow, and even subtle quantum processes that connect us to the universe. When approached with knowledge and a clear intention, fasting allows a person to “open their eyes” and perceive the true nature of reality. In Vedic culture, our everyday world is called Maya (illusion). Fasting practices help peel away this illusion and reveal the underlying truth.
During religious fasts, senses become sharper, perception deepens, and one’s worldview often shifts. The body and mind are cleansed, and a sense of inner peace emerges. Each organ, every cell, and even the spirit align more closely with the higher power that transcends us. Some experience heightened intuition or clairvoyance, while others notice amplified sensations. The effects vary depending on the duration of the fast, the techniques used, and most importantly, the intention behind it.
Intention is critical. As I explain in my article “Fasting vs Starvation: Avoid Dangerous Mistakes”, fasting done with awareness is healing, while fasting without purpose or understanding can become harmful. The difference is profound — fasting restores, while misguided deprivation can damage the body and spirit.
Religious fasting, when practiced mindfully, becomes a tool for spiritual awakening, energetic realignment, and deep inner transformation.
How to fast safely
As you have understood, fasting in religious traditions is never just about food. It is a sacred act that requires mental, emotional, and spiritual preparation. To do it safely and meaningfully, consider these guidelines:
- Begin with intention – The mind must be prepared first. Set a clear spiritual purpose: purification, prayer, healing, or devotion. Without intention, fasting becomes just physical deprivation.
- Gradual preparation – Reduce heavy, processed foods, caffeine, and stimulants in the days before. Many traditions (like Orthodoxy or Ayurveda) recommend light, natural foods before the fast.
- Spiritual focus – Combine fasting with prayer, meditation, scripture reading, or chanting. The mind must stay aligned with the spirit, not just the body.
- Avoid excess strain – Religious teachers often caution against overdoing it. Respect your body’s limits and choose a duration that feels right for your stage of practice.
- Stay mindful of emotions – Anger, gossip, and negativity break the spirit of a fast. Replace them with compassion, forgiveness, and quiet reflection. Nevertheless, during prolonged fasting, a person may experience a wide range of emotions and sensations. Enlightenment can come alongside sorrow, fear, disappointment, pain, loss, joy, or even simple pleasures. Every emotion or feeling can appear as part of the cleansing and awakening process. This is particularly true for extended practices, such as those that purify the chakras and energy channels. Part of this transformation is connected to the subtle energetic shifts described by Bruce Lipton in his books, and it is especially evident in dry fasting, where the body and mind undergo profound reprogramming.
- Limit worldly distractions – Avoid phones, TV, and microwaved foods. During fasting, the body and mind become extremely sensitive and “reprogrammed.” Protect this sacred state.
- 🔴 Beware of misleading fasting advice – Many blogs online that appear authoritative actually give dangerously inaccurate guidance. For example, some recommend breaking a fast longer than 24 hours with fruit juice. Biochemically, this is a serious mistake. Sudden intake of concentrated sugars after prolonged fasting can cause rapid blood sugar spikes, digestive distress, and metabolic shock. Such advice is not only unsafe but reflects a lack of research and understanding of the physiology of fasting. As an experienced fasting mentor, it is clear that authors promoting this approach have not practiced prolonged fasting themselves nor consulted credible scientific sources. I will never stop repeating this: Fasting is a powerful tool for physical, mental, and spiritual health, and it demands knowledge, caution, and respect. Misguided recommendations put people at risk and undermine the transformative potential of this practice.
- End gently – Breaking the fast should be done slowly, with gratitude. Many traditions begin with vegetable, water, or light plant-based foods before returning to normal meals.
