Cursus Brevis
Cursus Brevis
The short course to an organized life
A Cursus Brevis short course

Fasting: A Short Course

Work up to a 24-hour fast in four weeks — gently, safely, body and soul.

$14
40-page PDF · instant download
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40 pages
Printable tracker
Sourced, with live links
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Why this one

Fasting sounds like something for saints and athletes. It isn’t.

It’s an ordinary practice that ordinary people have kept for thousands of years, and you can learn it the same way you learn anything else: slowly, in small steps, with a plan.

Four weeks. One small step at a time. From an overnight fast to a full twenty-four hours. No white-knuckling, and no starting over every Monday.

The four weeks

You never jump. You climb.

Week One
Close the kitchen after dinner.
12 hours, every day
Week Two
Meet a hunger wave, and watch it pass.
14 most days · 16 once
Week Three
Skip a meal and find out you’re fine.
16 most days · 18 once
Week Four
Go the distance, once, on purpose.
16 · 20 midweek · 24 once

The hours include sleep. A twelve-hour fast is dinner at seven and breakfast at seven — you’re asleep for most of it. That’s not a trick; it’s how the ladder stays gentle.

What’s inside

Forty pages, five parts

1
Why fast at all
What happens in your body hour by hour, the older story in Scripture and the Church, and an honest page about what fasting will not do.
2
Before you begin
Who should not fast, when to stop, the five rules that make it work, and a page about food, guilt, and worth.
3
The four weeks
Week by week, with a printable four-week tracker.
4
The day itself
The night before, the day hour by hour, how to break a 24-hour fast, and when to stop early.
5
Making it a rhythm
Troubleshooting, fasting in a house full of people, a short order of prayer for a fast day, and a real FAQ.
For the faithful

What the Church actually asks

“The divine law binds all the Christian faithful to do penance, each in his or her own way.”
canon 1249

Most people are surprised by how modest the obligation is — and by how much freedom sits around it. The guide lays it out in one plain table.

Days of fastAsh Wednesday and Good Friday. That is the entire list.
Who is bound to fastAges 18 up to 59.
What a fast day meansOne full meal, plus two smaller meals that together do not equal a full meal.
Abstinence from meatAsh Wednesday, Good Friday, and every Friday of Lent. Age 14 and older.
Before CommunionOne hour without food or drink, “except for only water and medicine.”

Sourced to the Code of Canon Law, the USCCB, and the Catechism — with live links you can tap.

Real talk

It also tells you what fasting won’t do.

Autophagy timings come from animal studies — human timing isn’t established. Fasting is not a weight-loss guarantee. There is no magic switch at hour sixteen. Where the research is thin or disputed, this guide says so instead of picking the most confident-sounding number.

Two full pages of sources with live links — Johns Hopkins, StatPearls, Mayo Clinic, Cleveland Clinic, the Code of Canon Law, the USCCB, and the Catechism — so you can check every claim yourself.

That honesty is the reason you can trust the other thirty-nine pages.
What you get

One instant download

  • 1 PDF · 40 pages · 8.5 × 11 US Letter
  • Print it, or read it on your phone — the type is sized for both
  • A printable four-week tracker
  • Clickable source links throughout
  • Personal use. No subscription, no app
Add-on · $3

Breaking the Fast

The guide teaches you when not to eat. This seven-page companion covers what to do when the fast is over — the first meal, the table and the prayer.

  • Five steps back to the table, from the first glass of water to the last bite
  • What to eat first, and what to wait on
  • When to stop a fast and get help
  • A short grace to close the fast

Add the companion — $3

Start where you actually are

Week one is twelve hours.

Close the kitchen after dinner tonight and open it at breakfast. That’s the whole assignment.

$14
40-page PDF · instant download
Get the guide

Small steps. Big difference. You’ve got this.

All sales are final — this is an instant digital download. If the file won’t download or open, is missing pages, or a link is broken, email marty@cursusbrevis.com and I’ll make it right. Full policy at /policies.html.