Intermittent Fasting

Intermittent fasting doesn't have to be complicated.

At its simplest, you're creating a period of the day when you eat and a period when you don't eat.

The reason I like fasting as part of my own approach isn't because I think fasting is some kind of magic trick. I use it because it helps simplify eating, gives me periods without constantly bringing food into my body, and fits naturally with my low-carbohydrate approach. My source material also describes intermittent fasting as something I “sprinkle” into the Zapp the Fat Diet as part of my overall lifestyle.

But I want you remembering the same principle I use everywhere else in PayToCommit:

Incremental action is key.

You don't have to wake up tomorrow and immediately decide:

“I'm only eating once a day from now on.”

Start where you are.

Learn how your body responds.

Then build from there.

What the Numbers Mean

When you see something like:

14:10

or:

16:8

the first number represents the fasting period and the second represents the eating window.

So:

14:10 = 14 hours fasting + 10 hours eating

16:8 = 16 hours fasting + 8 hours eating

18:6 = 18 hours fasting + 6 hours eating

20:4 = 20 hours fasting + 4 hours eating

The source specifically uses 16:8 as an example: eight hours of eating followed by sixteen hours without food.

The exact clock times don't have to be identical for everybody.

For example, a 16:8 schedule could mean someone eats during one eight-hour portion of the day and fasts during the remaining sixteen hours.

What matters is the structure.

12-Hour Fasting

This is probably one of the simplest places to begin.

A 12-hour fast means twelve hours without eating.

You could think of it as a basic overnight fasting period.

If somebody isn't accustomed to fasting at all, I like the idea of beginning with something manageable instead of immediately trying to prove they can go an entire day without food.

The material we've already developed says that during approximately the first 8 to 12 hours, your body is beginning to use and deplete glycogen, insulin is decreasing, and ketones can begin rising, although that rise may still be relatively small.

But remember what I told you in the previous chapter:

Don't turn the clock into a metabolic guarantee.

Twelve hours tells you how long you haven't eaten.

It doesn't tell you that every person reaches exactly the same metabolic state at hour twelve.

14:10

The next step could be:

14 hours fasting + 10 hours eating.

This simply extends the period without food by another two hours compared with a 12-hour fast.

For someone trying to build the habit gradually, that may be a much more realistic progression than jumping directly into a narrow eating window.

That's exactly how I want fasting approached:

12 hours → become comfortable → extend gradually if appropriate.

Not:

“What's the hardest fasting schedule I can survive?”

Fasting isn't an endurance contest.

16:8

This is the fasting schedule your source specifically uses as a traditional example:

16 hours fasting + 8 hours eating.

You eat during an eight-hour window.

Then you don't eat for sixteen hours.

The material also makes something important clear:

You don't have to begin there if it's difficult.

Start building your “fasting muscle” gradually.

I like that way of thinking.

If twelve hours currently feels easy, maybe fourteen becomes your next step.

Then maybe sixteen.

Give yourself time to adapt.

18:6

An 18:6 schedule means:

18 hours fasting + 6 hours eating.

Now you're compressing your meals into a smaller portion of the day.

As fasting extends, your body is generally moving farther away from continuously relying on incoming food and increasingly toward stored fuel, although the exact metabolic timing varies from person to person.

The previous chapter already established why I don't want you thinking:

“18 hours means this exact biological event happens.”

Someone already adapted to a ketogenic diet may be in a different metabolic state at eighteen hours than somebody coming directly from a high-carbohydrate diet.

So use eighteen hours as the schedule, not as a promise about exactly what's happening inside your body.

20:4

A 20:4 schedule means:

20 hours fasting + 4 hours eating.

Now you're giving yourself a relatively small eating window.

That can simplify eating dramatically.

But don't interpret a smaller eating window as automatically better.

The goal isn't:

“Eat during the shortest window possible.”

The goal is to find an approach that helps you maintain your eating plan while still getting the food and nutrition you need.

Remember:

Longer doesn't automatically mean better.

That principle becomes even more important when we get into prolonged fasting.

OMAD — One Meal a Day

Then we have:

OMAD — One Meal a Day.

Instead of having a long eating window, you're eating one meal during a relatively short period and then fasting until your next meal the following day.

Your source explicitly puts OMAD after becoming comfortable with intermittent fasting:

Intermittent fasting → OMAD → one-day fast → two-day fast → three-day fast.

OMAD is something I personally use.

One reason I like it is simplicity.

One meal means:

Less meal planning.

Less cooking.

Less cleanup.

Less snacking.

Less time thinking about food.

It can also make it easier for some people to eat less overall simply because they're fitting their food into one meal rather than eating continuously throughout the day. If that results in a calorie deficit over time, weight loss can follow.

But OMAD isn't magic.

Make Your One Meal Count

If you're eating only once, that meal becomes extremely important.

Don't fast the entire day and then say:

“Great. Now I can eat junk food for my one meal.”

That's missing the point.

The source specifically emphasizes making that one meal nutritionally meaningful and getting adequate:

Protein.Energy.Vitamins.Minerals.Other nutrients.

And OMAD won't necessarily work well for everybody.

Some people may find it difficult to get everything they need from one meal.

That's okay.

You don't win an award because your eating window is shorter than somebody else's.

Listen to Genuine Hunger

This is probably the most important part of my personal fasting routine.

My fasting window isn't always rigid.

Some days I'm hungry sooner.

Other days I'm simply not hungry.

When I'm not hungry, I don't force myself to eat because the clock says:

“Time for breakfast.”

When I'm genuinely hungry, I eat.

That's exactly how the source describes my approach.

For me, fasting isn't about punishment.

It's about learning not to eat automatically.

The Progression I Prefer

If you've never fasted before, don't make this harder than necessary.

Think:

12-hour fast

↓

14:10

↓

16:8

↓

18:6

↓

20:4

↓

OMAD, if appropriate

You don't necessarily need to pass through every single stage.

And your source doesn't provide separate outcome evidence proving that 18:6 is superior to 16:8 or that 20:4 is superior to 18:6.

So I'm not going to invent that.

The purpose of showing these schedules is to help you understand that intermittent fasting exists on a spectrum.

Start with something realistic.

See how you respond.

Then decide whether extending the fasting period actually improves your ability to follow your plan.

Fasting should simplify your life, not become another obsession.