Let me start with what fasting is not.
It's not a diet. It's not a spiritual superpower you unlock by skipping breakfast. It's not something you do to earn God's favor or demonstrate how serious you are about your faith. I've made all three of those mistakes, and they each produce a version of fasting that misses the point entirely.
I started fasting in my mid-thirties, inconsistently and without much understanding. A pastor suggested it. I tried it. It was uncomfortable. I went back to eating. For years, I kept fasting at arm's length — I believed it was good in principle but found twenty-seven reasons to push it to next week.
Then something changed. I was going through one of the harder seasons of my life. My father had died. A relationship I'd invested years into had fractured badly. I was professionally successful and personally unmoored. I started fasting regularly — once a week, every Tuesday — not because I had it figured out but because I was desperate enough to try something I'd been avoiding.
What I found there surprised me.
What Every Major Tradition Knows
Christians, Jews, Muslims, Buddhists, and practitioners of almost every major contemplative tradition have used fasting for thousands of years. That breadth of agreement across different religions and cultures isn't coincidence. These communities weren't comparing notes. They all arrived at the same conclusion through independent experience: abstaining from food creates a specific kind of interior space that is difficult to access any other way.
The Desert Fathers of the 4th century wrote extensively about fasting as a tool for attention — not for spiritual performance, but because hunger has a way of stripping the noise away. When your stomach is quiet (or rather, loudly protesting), you become very aware of what you're actually hungry for. Physical hunger has a clarifying effect on spiritual desire.
"Fasting is the soul of prayer, mercy is the lifeblood of fasting. Let no one try to separate them; they cannot be separated." — Augustine of Hippo
Augustine's framing is worth sitting with. Fasting isn't a standalone discipline. He pairs it with prayer and generosity — which tells you something about what fasting is actually for. It's not self-denial for its own sake. It's reorientation.
What Happens in Your Body (and Why It Matters)
Modern science has given us language for what the ancients experienced and described without the benefit of biochemistry. When you fast, several things happen in sequence. Insulin levels drop. The body begins moving from glucose to fat as its primary fuel source. Around twelve to sixteen hours in, autophagy kicks in — the cellular cleanup process in which the body literally clears out damaged components and regenerates healthier ones. Peter Attia and other longevity researchers have written extensively about the metabolic benefits of periodic fasting.
But here's what I find equally interesting: fasting also quiets the dopamine noise. We spend enormous energy in the constant low-level pursuit of the next small reward — food, information, approval, entertainment. When you remove the food layer, you begin to see the others more clearly. You realize how much of your emotional energy goes toward managing appetites that never quite get satisfied anyway.
That's not a comfortable realization. It's a useful one.
What I've Learned on Tuesdays
I've been fasting on Tuesdays for about fifteen years now. Not every Tuesday — I'm human and travel and family and genuine physical needs have interrupted the practice regularly. But enough Tuesdays that I can speak with some experience.
Here's what I've noticed:
The afternoon is always the hardest part. Not because I'm physically suffering — by mid-afternoon I'm usually past the acute hunger and into something that feels more like heightened alertness. It's hard because that's when I start negotiating with myself. "You've done enough. You could just eat something small. No one will know." The voice that makes that argument is the same voice I hear in every area of life where something is required of me that I'd rather not give. Fasting has introduced me to that voice in a very direct way.
Prayer on fasting days is different. I don't know how to explain this precisely. It's not that God is more present. But I'm more present to the presence. Something about physical hunger makes spiritual hunger more accessible. The walls come down a little.
Breaking the fast matters. What you eat when the fast ends, and how much attention you bring to it, is part of the practice. I try to eat slowly, gratefully. It becomes a small communion — a reminder that every ordinary meal is gift.
"We must fast before we can feast. The preparation is part of the feast." — Alexander Schmemann
If You've Never Seriously Tried It
I want to be careful here. Fasting is not for everyone in every season. If you have a history of disordered eating, please don't do this without medical guidance. If you're pregnant, nursing, managing a chronic illness, or on medication, talk to your doctor first. I'm not recommending fasting as a health hack. I'm describing a spiritual practice that has served me — and that the wisdom traditions of the world have commended — for very specific reasons.
If you're in a season where you're healthy and curious, here's what I'd suggest: don't start with a twenty-four-hour fast. Start with a twelve-hour window — say, from 8pm to 8am — and spend the second half of that window in intentional prayer or reflection. Give your attention somewhere specific instead of just being hungry. Notice what comes up.
Then try it from dinner to dinner one day and see what you find. Not to prove anything. Not to lose weight. Not to check a box. But because there might be something waiting for you in the quiet that hunger makes — something you've been too comfortable and too full to hear.
Most of the richest things in my spiritual life have required something from me that I'd rather have kept. The journal. The early mornings. The years of showing up to communities where I was known and sometimes corrected. The fasts.
The invisible work is almost always where the most significant things happen.
What's one appetite — physical, digital, emotional — you'd want to understand better? What would happen if you temporarily said no to it?