I’ve sat through a hundred sermons that mention fasting the same way they mention flossing. “You should really do this.” Nobody explains how long, what you’re allowed to drink, what it’s supposed to feel like on day two, or what you’re actually supposed to be doing with the hunger once it shows up. The preacher moves on to the next point, and so do you, and fasting stays a thing you know you should do and have never actually done.
Christians fast because scripture assumes it, not because it’s optional. Jesus said “when you fast,” not “if you fast” (Matthew 6:16-18), treating it the same way he treated prayer — a normal part of following God, not a bonus round for the spiritually advanced. Fasting is the voluntary denial of food, most fully expressed as water-only, done to humble yourself before God and focus your full attention on him during a specific season: repentance, grief, decision-making, or simply drawing closer. It shows up from Moses to Jesus to David. It built entire seasons of the early church calendar. And it’s the front door into everything I coach inside Project Kingdom Gladiator, starting with the Kingdom Reset.
Here’s what almost nobody teaches you along with the command: what it actually does to your body, why a five-day water fast is where I start every man I coach, and what you’re actually supposed to be doing with the hunger once it hits. That’s this whole post.
The Sermon That Never Tells You How
I don’t think most churches dropped fasting on purpose. I think it just quietly slipped off the list of things anyone actually teaches.
Two things happened, and they happened at the same time.
First, fasting is hard, and people don’t like doing hard things. That’s not a criticism unique to the church — it’s just true of people. Given a choice between something hard and something easy, most rooms full of people drift toward easy. Somebody has to keep putting the hard thing back in front of them on purpose.
Second, and this is the part I think actually did the damage: the church talks about fasting like everybody already knows how to do it. “You should fast” gets said from the pulpit the same way “you should pray more” gets said — as a general spiritual nudge, not an actual instruction. Nobody follows it up with how long, what to drink, what you’ll feel on day two, or what you’re supposed to do with your hands and your mind once the hunger hits. So people hear the command, agree with it, and never act on it, because acting on it feels like jumping into a pool with no idea how deep it is.
That gap — between “you should fast” and actually knowing how — is the whole reason this post exists. Isaiah 58 calls fasting something you choose (Isaiah 58:6), not something that happens to you. Nobody chooses a discipline they’ve never seen modeled with real, specific instructions attached to it.
I hear this from men in ministry more than anyone else. You’ve told your congregation to fast during a season of prayer, maybe led a corporate fast for the church. And privately, you’ve never actually done a real one yourself — or you tried once, made it to noon, and quietly let it go. That’s not hypocrisy. That’s the same gap everybody else has, just with a microphone in front of it. This post is the instruction I wish someone had handed me the first time I tried.
“When You Fast” — Not “If”
Go read the Sermon on the Mount and look at how Jesus structures three disciplines back to back: giving, praying, fasting (Matthew 6:1-18). He doesn’t build a case for fasting or spend a paragraph convincing you it’s worth doing. He assumes you’re already doing it.
“And when you fast, do not look gloomy like the hypocrites, for they disfigure their faces that their fasting may be seen by others. Truly, I say to you, they have received their reward. But when you fast, anoint your head and wash your face, that your fasting may not be seen by others but by your Father who is in secret. And your Father who sees in secret will reward you.” (Matthew 6:16-18, ESV)
Read that again. “When you fast.” Twice. Not “if you decide to try it sometime.” Jesus corrects how the Pharisees were fasting — publicly, dramatically, for an audience — but he never questions whether his listeners should be fasting at all. He treats it exactly the way he treats prayer: a normal, expected part of following God, done in secret, for God’s eyes, not a performance for a crowd.
That’s the piece most churches skip. Fasting isn’t a New Testament command in the sense of a direct order — “thou shalt fast every Wednesday” doesn’t appear anywhere. But scripture doesn’t need a direct order for something to be assumed practice. Jesus assumed it. The early church assumed it. I want you to start assuming it too.
What Actually Counts as a Fast
Here’s where I’ll say something that might rub some people the wrong way: the Daniel Fast, as popular as it’s gotten, is not the fullest expression of biblical fasting. It’s a real, legitimate form of fasting — I coach it myself as an alternative — but it’s a partial fast. You’re still eating. You’re restricting what you eat, not whether you eat.
The fast that shows up again and again in scripture as the real thing — the full expression, the one that actually costs you something — is water-only. No food. Moses did it. Jesus did it. David did it in grief. That’s the practice I think most Christians should be doing more of, and it’s the one I build my own coaching program around.
To be fair to Daniel himself: what he actually did in Daniel 1 was request vegetables and water instead of the king’s food and wine for ten days (Daniel 1:8-16). He wasn’t dieting. He was a teenage exile in a pagan king’s court, and the king’s food had almost certainly been offered to idols first, the same defilement issue I cover in my post on meat sacrificed to idols. Refusing it was an act of loyalty to God in enemy territory, not a health plan. “At the end of the ten days they looked healthier and better nourished than any of the young men who ate the royal food” (Daniel 1:15, NIV) — God honored the obedience, not the vegetables themselves.
Later, in Daniel 10, he goes three weeks eating “no choice food,” no meat, no wine, using no lotions (Daniel 10:2-3, NIV), mourning and seeking God over a vision he’d received. Neither of those is a water-only fast — they’re both restrictions on what he ate, not a full fast from food. That’s exactly why I built the Daniel Fast the way I did in my own program: a real, biblically grounded partial fast for anyone who can’t safely go water-only, not a compromise or a lesser version pretending to be the real thing.
The Water-Only Fasts Scripture Actually Records
When scripture wants to show you someone genuinely fasting — no food, full stop — it usually says so directly.
| Who | Reference | Length | Context |
|---|---|---|---|
| Moses | Exodus 34:28 | 40 days, 40 nights | On Mount Sinai receiving the covenant. “He neither ate bread nor drank water.” |
| Jesus | Matthew 4:2, Luke 4:1-2 | 40 days, 40 nights | In the wilderness before his public ministry began, tempted by the devil. |
| David | 2 Samuel 12:16-23 | Seven days | Pleading with God for his sick son’s life. |
| The people of Nineveh | Jonah 3:5-8 | Undefined, urgent | An entire pagan city fasting in repentance, from the king down to the animals. |
| Esther and the Jews of Susa | Esther 4:16 | 3 days, no food or water | Before Esther approached the king to save her people. |
Moses and Jesus are the two that anchor everything for me. Moses fasted forty days without bread or water on the mountain where God gave him the covenant (Exodus 34:28). Jesus fasted forty days in the wilderness before he ever preached a sermon or healed anyone (Matthew 4:1-2). Neither of those men needed the fast to survive. Both of them needed it to be ready for what came next.
Nineveh and Esther are worth slowing down on too, because neither one is an individual proving something to God alone. In Jonah 3, an entire pagan city — a place scripture treats as genuinely wicked — hears one sentence of warning from a reluctant prophet. It responds by fasting from the king down to the livestock (Jonah 3:5-8), and God relents. Esther’s fast is smaller in scale and higher in stakes. Before she risks her life walking into the king’s presence uninvited, she asks every Jew in Susa to fast with her for three days, “and do not eat or drink,” alongside her (Esther 4:16). Neither of those fasts was a private spiritual exercise. Both were a whole community putting its full weight behind one urgent request to God at once.
I’ll flag one more example people often lump in with these, because it’s close but not quite the same thing: Elijah. After the angel fed him, he “went in the strength of that food forty days and forty nights to Horeb, the mountain of God” (1 Kings 19:8, ESV). That’s not a food-free fast — it’s forty days sustained by one supernatural meal. Real, and worth knowing, but a different kind of provision than what Moses and Jesus did.
The Fast God Actually Wants
Fasting can turn into a performance. It happened in Jesus’ day — the Pharisees “disfigure their faces” so everyone can see how spiritual they are (Matthew 6:16). It happens now, when someone posts about their fast for the likes more than they seek God in the silence.
Isaiah 58 is God’s answer to a people who fasted and got frustrated that he didn’t seem to notice.
“Is such the fast that I choose, a day for a person to humble himself? Is it to bow down his head like a reed, and to spread sackcloth and ashes under him? Will you call this a fast, and a day acceptable to the LORD? Is not this the fast that I choose: to loose the bonds of wickedness, to undo the straps of the yoke, to let the oppressed go free, and to break every yoke?” (Isaiah 58:5-6, ESV)
God’s complaint in that chapter isn’t that his people were fasting wrong technically. It’s that they were fasting and then going right back to their normal lives — exploiting workers, ignoring the hungry, quarreling — as if the fast itself was the whole assignment. He wanted the humility that a real fast produces to actually change how they treated people once the fast ended.
That’s the standard I hold myself to. A fast that doesn’t humble you in front of God and change something in how you live afterward isn’t the fast God’s actually after — it’s just skipping meals with better branding.
What Happens Inside Your Body When You Stop Eating
I’m a trainer, not a doctor, so I want to be straight about that up front. But I’ve read the research, and I’ve lived through this cycle enough times myself to know what’s typical.
| Day | What’s Happening |
|---|---|
| Day 1 | Your body burns through stored glycogen (carbs). Insulin starts dropping. Hunger cues hit hardest here, mostly from habit — your brain expecting a meal at the usual time. |
| Day 2 | Glycogen runs out. This is the roughest day for most people — brain fog, irritability, fatigue as your body shifts fuel sources. A lot of quick “water weight” drops here as stored glycogen releases the water bound to it. |
| Day 3 | Your body switches over to running mostly on fat, producing ketones for fuel. Hunger tends to ease up noticeably. Cellular cleanup processes (autophagy) ramp up. |
| Day 4 | Deep ketosis. Growth hormone can rise to help protect muscle tissue while your body burns fat for energy. |
| Day 5 | Things stabilize. You’re not fighting your body anymore — you’re just running on it. |
Research on extended water fasting backs up what that timeline predicts. Total weight loss over five days typically lands around 4-6% of body weight, and most of what shows on the scale in the first couple of days is water and glycogen, not muscle (BodySpec, 2025). Fasting insulin drops sharply. Blood pressure tends to come down too, over the course of the fast.
None of that is the point of the fast. It’s a real, physical side effect of doing something scripture asks of you for spiritual reasons. But it’s also not nothing, and I’m not going to pretend the health data doesn’t matter just because weight loss isn’t the goal. God built a body that responds to fasting in ways modern research keeps confirming. That’s not a coincidence. That’s design.
What the Research Debate Actually Shows
I told you I’d draw the line honestly on medical caution, so let me show you where the research itself disagrees, instead of picking whichever number makes fasting sound better.
A 2024 narrative review of prolonged water-fasting trials in Nutrition Reviews — fasts running 5 to 20 days — found the practice “moderately safe,” with no deaths or serious medical events reported across the studies it covered. Mild side effects were common: headaches, insomnia, fatigue, dizziness, dry mouth (Cherif et al., 2024, Nutrition Reviews). That lines up almost exactly with what I described in my own experience above.
Here’s the part worth sitting with, though. That same review found that roughly two-thirds of the weight lost during prolonged fasts was lean mass, not fat — and the authors flagged that as a real concern, not a footnote. Other sources, including the blog data I cited earlier, frame most of the early “lean mass” drop as water and glycogen rather than muscle protein breakdown. Both can’t be fully right at the same time, and I’d rather tell you the research is split than pretend it’s settled. What both sides agree on: the benefits of fasting fade fast once normal eating resumes — that same review found the metabolic improvements were gone within three to four months, even in people who kept the weight off.
None of that changes my position that a five-day water fast is safe for the average, medically cleared adult. It does mean I’m not going to sell you on fasting as some kind of free lunch with zero tradeoffs. It costs you something, physically, for a handful of days. I think what it produces spiritually is worth that cost. I just want you walking in with your eyes open instead of a highlight reel.
Why I Built the Funnel Water First, Then Plants
Every man who joins Project Kingdom Gladiator starts the same way: five days of water only — the Kingdom Reset — before he touches a meal plan, a workout program, or anything else.
I built it that way on purpose, for a few reasons.
A five-day water fast gets you a real, fast win. You complete something genuinely hard in your first week, and that changes what you believe about yourself for the rest of the program. If you can go five days without food, a 40-day training phase stops looking impossible. You’ve already proven the harder thing.
There’s also a physical logic to what comes next. Coming off five days of nothing but water straight into meat and a full plate is a rough transition for your gut. Seed-bearing plants — what I call the Adam Fast, five more days, plants only — ease your digestion back online before clean meat ever gets added back in. It’s not arbitrary. It’s the gentlest on-ramp back to real food.
I’ve watched what happens when a man skips that transition entirely — goes straight from five days of nothing to a plate of steak because he’s earned it. His gut wasn’t built to handle that jump, and the first meal back usually turns into the hardest part of the whole fast instead of the reward for finishing it. Seed-bearing plants are gentle on a system that’s been running on nothing but water. Clean meat isn’t. Skip the bridge and you build the wrong association in your head — that breaking a fast means feeling worse, not better — right when you need the opposite lesson to stick.
And there’s a structural reason that runs underneath both of those practical ones. I’ve come to see the pattern of creation itself as a rough sketch of that same order. I’ll say up front: this next part is a theory I hold loosely, not a doctrine I’d stake anything on. Water shows up as early as Genesis 1:2, before God speaks a single day into existence. Vegetation — seed-bearing plants and fruit trees — gets created on day three (Genesis 1:11-12). But the actual instruction to eat, the moment God hands Adam and Eve their first meal, doesn’t come until day six: “I have given you every seed-bearing plant on the face of the whole earth and every tree that has fruit with seed in it. They will be yours for food.” (Genesis 1:29, NIV). Nobody’s eating anything before that verse. Water comes first, in some form, from the very beginning, with provision growing quietly in the background. Only then does food arrive, by direct command.
I’m not claiming Adam personally fasted for five literal days before that command — he wasn’t created yet for most of that stretch. What I am saying is that the pattern matches: water present from the start, food arriving later by God’s own hand, seed-bearing plants as the first meal anyone ever ate. Kingdom Reset first, Adam Fast second, then clean meat layered on top once your body’s ready, the same way Noah’s generation only got permission to eat meat after the flood (Genesis 9:3) — food added in stages, not all at once. I go deeper into that whole argument here.
Five Days, Water Only: What Actually Happens to Me
I’ve run the Kingdom Reset fast myself more times than I can count at this point, and I still can’t tell you exactly what makes one attempt easy and another one hard. Some five-day fasts feel like nothing. Others make me earn every hour.
What I can tell you is the pattern that repeats almost every time.
Day one is fine until lunch, sometimes until late afternoon. That’s the hardest stretch of the whole fast for most people, myself included — not because your body’s actually struggling, but because your habits are screaming at you that it’s time to eat. Get through that first hunger wave and the rest of day one is smooth.
Day two runs about the same. By day three, something shifts. My body adjusts, and the rest of the fast tends to be smooth sailing from there.
I get the occasional headache, usually early on — probably caffeine pulling back, sugar pulling back, or just my body clearing out whatever processed junk had built up. I get cold during a fast, which is a side effect I never hear anyone else mention, but it’s real and it happens almost every time. My sleep gets noticeably better. I still drink one cup of black coffee in the morning. Some of my clients push it later instead, right around the point where hunger and tiredness both hit hardest, and it helps carry them through.
Spiritually, every single fast reminds me of the same thing: I can do hard things, and God has my back through them. I go into each fast with one specific spiritual focus — something I’m wrestling with, praying through, seeking an answer on. By the end, I almost always have real clarity on that one thing. That’s not a coincidence. It’s what fasting is actually built to produce.
Who Shouldn’t Do a Water-Only Fast — and Why the Daniel Fast Exists
Scripture tells you to fast. It doesn’t tell you to be reckless with the body God gave you while you do it.
If you’re on any medication, talk to your doctor before you start. Taking medication on an empty stomach for multiple days can cause nausea and other problems your prescribing doctor needs to weigh in on, not me. Pregnant or breastfeeding women, anyone underweight, and anyone with a history of an eating disorder should not attempt a water-only fast. That’s not a suggestion — that’s a hard line.
Realistically, I think we’re all adults, and it’s your body. If you think you’re able to fast, try it, starting with something short. If you’re not sure, talk to your doctor first. But legally and honestly, everybody should check with a doctor before an extended fast, because you might have something going on in your body right now that neither of us knows about.
I’ll be straight about where I land personally: I think too many men wait for permission that never comes. You don’t need a green light from every corner of your life to try a one-day fast this week. What you need is enough honesty with yourself to know whether “I should probably check with my doctor” is a real medical concern or just a comfortable excuse to never start. Most men reading this, with no medication and no diagnosed condition, are cleared to try it. If that’s not you, that’s exactly what the Daniel Fast is for — not a consolation prize, a real path to the same obedience.
There’s a real medical reason to take the back half of a fast just as seriously as the front half. Refeeding syndrome is a genuine, dangerous complication that can happen when someone comes off an extended fast and eats too much, too fast. It’s driven by a sudden shift in electrolytes — phosphorus, potassium, magnesium. It typically shows up within the first five days of breaking a fast, most often in people who’ve lost more than 10% of their body weight or gone without food for over a week (Cleveland Clinic, 2024). It’s part of why the Adam Fast exists at all. Seed-bearing plants ease you back into eating instead of throwing a full plate of meat at a gut that’s been empty for five days.
This is exactly why I built the Daniel Fast into my program as the alternative. If a water-only fast isn’t safe for you — medication, a health condition, pregnancy, whatever it is — the Daniel Fast gives you ten days of seed-bearing plants and water. You’re still fasting. You’re still humbling yourself before God on the same schedule as the Kingdom Reset. You’re just doing it in a way your body can actually handle.
| Kingdom Reset | Adam Fast | Daniel Fast | |
|---|---|---|---|
| Length | 5 days | 5 days | 10 days |
| What’s allowed | Water only | Seed-bearing plants + water | Seed-bearing plants + water |
| Role in the system | Entry point — the free lead magnet | Transition step after Kingdom Reset, back into full food | Medical alternative to Kingdom Reset for anyone who can’t safely go water-only |
| Who it’s for | Anyone medically cleared for a water-only fast | Anyone who just finished Kingdom Reset | Anyone who can’t do a water fast — medication, pregnancy, health condition |
Fasting Used to Be Normal — Here’s What Happened
This isn’t a new practice the church is bad at. It’s an old practice the church quietly stopped teaching.
The Didache is the earliest Christian document outside scripture that gives instructions for daily church life, written in the first century. It tells believers to fast on Wednesdays and Fridays — deliberately different days than the Jewish fasting custom of the time, so Christian fasting had its own rhythm from the very start. Fasting wasn’t an occasional special event. It was a weekly discipline, built into ordinary Christian life from the earliest generation we have written records for.
That pattern grew into Lent, the forty-day fast leading up to Easter, modeled directly on Jesus’ forty days in the wilderness. The Council of Nicaea formalized the forty-day period in its canons, and church fathers after it — Athanasius, Augustine, John Chrysostom — all wrote about observing it (Christian History Institute). For most of church history, across most of the church, fasting wasn’t optional or occasional. It was structured into the calendar.
Even after the Reformation, when a lot of Protestant tradition drifted away from fasting as a formal practice, John Wesley held onto it. He fasted twice a week himself, Wednesdays and Fridays, and he required anyone who wanted to become a Methodist preacher to do the same (Classically Christian). Wesley looked back at the early church’s example and decided the discipline was worth keeping, even while most of Protestantism around him was letting it go.
One more piece of that history connects directly back to Isaiah 58. Peter Chrysologus was a fifth-century bishop known as “Golden-Worded” for how he preached. He taught that prayer, fasting, and mercy toward others weren’t three separate disciplines but one: “Prayer, mercy and fasting: these three are one, and they give life to each other” (Crossroads Initiative). Prayer knocks, he said. Fasting obtains. Mercy receives. That’s the same rebuke God gives in Isaiah 58: fasting by itself, disconnected from how you actually treat people, was never the whole assignment. The church has known that for close to sixteen hundred years, even when it forgot to teach it.
So when I say most modern churches have quietly dropped fasting, I mean it plainly: this isn’t how it’s always been. It’s how it’s become, over the last century or two, in a culture that already avoids hard things and a church that stopped insisting on this particular one.
What Fasting Is Actually About
Everything up to this point has been the case for fasting, the history of it, the mechanics of it. Here’s the part I actually want you to walk away remembering.
Fasting is not primarily a weight loss tool. It works for that — I’ve documented it happening to me, and I’ll never pretend otherwise — but that’s a side effect, not the point. Scripture describes fasting as humbling yourself before God: “But as for me, when they were sick, my clothing was sackcloth; I humbled my soul with fasting” (Psalm 35:13, ESV). Ezra called a fast at the river Ahava “that we might humble ourselves before our God” (Ezra 8:21, ESV). Humility, not the scale, is the actual target.
Here’s what I want you to do with the hunger when it hits, because this is the part almost nobody teaches: that moment of hunger is a cue, not just a discomfort to push through. Every time you feel it, that’s your signal to turn toward God instead of toward food. Open scripture. Worship. Go on a walk and talk to him. Bring him whatever you’re actually wrestling with during that fast — a decision, a sin pattern, a relationship, a fear. Let the hunger keep pointing you back to it instead of letting your mind drift to what you’ll eat when it’s over.
That’s the actual mechanism. Fasting doesn’t magically make you more spiritual. It removes one of your normal comforts and gives you a repeated, physical reminder — dozens of times a day — to go find God instead. Do that enough times over five days, and you come out the other side with more clarity on whatever you were seeking him about than you would have gotten any other way. I’ve experienced that in nearly every fast I’ve done. It’s not a fluke.
Some men hear all of this and still land on “isn’t this just willpower with a Bible verse attached?” I get the question. Here’s the difference. Willpower is you gritting your teeth to prove something to yourself. Fasting, done right, is you emptying your hands on purpose so you’re not gripping anything else while you reach for God. One is about you. The other is about him. You’ll feel the same hunger either way — what you do with it is what makes it fasting instead of just skipping meals.
What About Work, Family, and Real Life?
You still have a job during a five-day fast. You still have kids who need dinner made, even if you’re not eating it yourself. That’s the most common hesitation I hear, and it’s a fair one.
Here’s what I tell every man before he starts. Plan your fast around a stretch where you’re not required to be at peak physical output. Most guys do fine with normal desk work, meetings, even light activity — but I wouldn’t schedule your hardest workweek, or a physically demanding job shift, for day two, when energy typically dips lowest. Keep serving your family exactly like normal. Cook the meal, sit at the table, be present. The discomfort of watching food you’re not eating is part of what makes this a fast instead of a convenient skip.
Tell your spouse before you start, not after. Not because you need permission, but because a five-day water fast changes your mood and energy in ways that are a lot easier on a marriage when she knows what’s happening and why. If you lead a ministry, tell your team too. You don’t owe anyone a public announcement, but the people closest to you should never be guessing why you’re off your normal rhythm for a week.
How to Actually Start
If you’ve never done a real fast, don’t start with five days of water. Start with one day — water only, sunup to sundown or a full 24 hours if you’re ready for it. Use every hunger pang as a reminder to pray instead of to check your phone. My full beginner’s walkthrough covers exactly what to drink and how to break that first fast safely if you want the mechanics laid out step by step.
Once you’re ready for the real thing, the Kingdom Reset is where I’d have you start — five days, water only, with a daily devotional walking you through it, free inside the Kingdom Gladiators Skool community. If a water fast isn’t safe for you, the Daniel Fast covers the same ten days, same purpose, seed-bearing plants instead of nothing. Either way, you come out the other side ready for the Adam Fast and, from there, the full Holy Diet. And if you want the theology behind all of this laid out on its own, separate from the funnel, that’s here.
Why Listen to Me
I’ve been a personal trainer since 2009, certified since 2011. I’ve worked the front desk up through minority ownership across seven boutique gym locations, and trained well over a hundred one-on-one clients along with thousands more gym members. I built the Holy Diet and Temple Training System after finding Genesis 1:29 sitting in church one Sunday, trying to figure out which of my clients’ diets was actually the right one.
I’m not writing this from the outside looking in. I’ve run the Kingdom Reset fast on myself more times than I can count, felt every part of what I described above, and I still fast regularly, not because I’ve arrived, but because it keeps working. I’ll say the same thing to you I say inside my own coaching program: I’ve carried extra weight through most of my career in fitness, and I’m still walking this out in real time, not writing to you from some finish line I’ve already crossed. If you’re waiting to feel qualified before you try this, you’re waiting for something I never had either.
The Only Assignment That Matters
A hundred sermons have told you to fast more. None of them told you what to do with your hands and your mind once the hunger actually hits. Now you know: open scripture, worship, walk with God, and let every hunger pang point you back to whatever you’re actually seeking him about.
Pick one day this week. Water only, until sundown. That’s the whole assignment, and it’s the only thing standing between you and understanding something about fasting that agreeing with a sermon never gave you.
