Find the Best Intermittent Fasting Schedule for You

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Intermittent Fasting | Schedules | 12/12 | 16/8 | 20/4 | OMAD | Crescendo | 24h | 36h | 5:2 | ADF | Intuitive | Best Plan | Weight Loss | Women | Men

Intermittent fasting is one of the easiest and healthiest lifestyle changes without extensive preparation.

Unlike conventional diet trends, intermittent fasting saves time and money instead of filling your daily schedule and fridge with new stuff.

Since recent studies have proven the health benefits of intermittent fasting, it is more popular than ever.

However, there are different types of fasting, and not all are suitable for every person – especially beginners.

This scientific guide will help you find an intermittent fasting schedule that fits your lifestyle.

What is Intermittent Fasting?

Intermittent fasting (IF) involves eating within a certain period and fasting for the rest of the day.

Countless forms of intermittent fasting exist, and we’ll look closely at them shortly. The most popular plan involves fasting within 16 hours.

In short, there are two main reasons to start intermittent fasting:

  • Weight loss
  • Health benefits

In this regard, the hormonal balance of our bodies is essential for both goals.

Because fasting is the best way to lower insulin levels, many people successfully lose weight and prevent obesity.

Insulin is responsible for signaling cells to take up glucose from the bloodstream and storing excess energy as fat or glycogen.

Accordingly, using insulin levels, researchers can predict 75% of the gain and loss in overweight people (Kong et al. 20131). 

In addition, insulin prevents the breakdown of body fat (Meijssen et al. 20012).

On the other hand, a fasting period stops nutrient intake and lowers insulin levels, thus ending the body’s storage mode.

Hence, the body can break down stored carbohydrates (glycogen). Once glycogen stores are empty, body fat can be burned for energy instead (ketosis).

The second primary driver of the health benefits of fasting is autophagy.

When nutrient intake and insulin levels drop, this intracellular recycling system kicks in, breaking down broken cellular parts and funneling toxins out of the body.

This finding was even awarded the Nobel Prize in Medicine (Levine et al. 20173).

For example, fasting improves:

However, not all methods offer the same benefits, as duration and frequency of fasting are determinants of fat burning and autophagy.

What Are the Different Intermittent Fasting Schedules?

Intermittent fasting methods are as individual as those people who use them.

Therefore, a colorful variety of intermittent fasting protocols can have significant differences. Different nutrition plans have individual advantages and disadvantages.

Let’s explore together what characteristics the different intermittent fasting types have and what advantages and disadvantages they bring to your daily schedule.

12/12 Intermittent Fasting (Circadian Rhythm)

12/12 Intermittent Fasting

Let’s start with the simplest method – overnight fasting. It consists of fasting for 12 hours every day. According to this, it is not fasting but eating within a specific time frame.

12 hours makes the three classic meals of the day feasible. After that, you stop snacking, which is already a significant step in the right direction for most people.

For example, you stop eating after dinner at 8 PM and don’t ingest any calories until 8 AM with breakfast the following day.

Since it is easy, this method can be a gentle introduction to intermittent fasting. Ultimately, you don’t have to skip any meals but give up snacks before bed.

However, this schedule does not take full advantage of the benefits of intermittent fasting. The longer the fasting period, the more significant the fat loss.

In addition, the health benefits of autophagy do not become apparent until about 14 hours of fasting (Yang et al. 20179).

A modification of overnight fasting is intermittent fasting according to the circadian rhythm. This biorhythm is an internal clock that runs 24 hours and regulates our energy levels based on the day and night rhythms.

So when you fast according to the circadian rhythm, daylight sets the timeframes. As soon as the sun rises, the eating period begins. With the sunset, on the other hand, the fasting period starts.

However, this intermittent fasting schedule only makes sense if you don’t live too close to the north or south pole. There the eating window would last partially for months.

However, the classical 12/12 intermittent fasting pattern is simple:

  • Fasting window: 12 hours
  • Eating window: 12 hours

16/8 Intermittent Fasting (Time-Restricted Eating, 14/10, 18/6)

16/8 Intermittent Fasting Schedule

Although various forms of intermittent fasting exist, eating within an eight-hour window is the most popular.

Classic 16/8 intermittent fasting is also known as the Lean Gains Method, Time-Restricted Eating, or Peak Fasting because it allows you to gain muscle mass while losing body fat.

Hence, even bodybuilders have been using classical 16/8 fasting for decades.

As the name time-restricted eating suggests, this method is the mother of many intermittent fasting schedules. It specifies a strict time each day during which eating is allowed. During the rest of the day, however, you strictly fast.

For example, you eat between noon and 8 PM. This way, the body can fast for 16 hours with an 8-hour eating period in between. Since you sleep 8 of the 16 fasting hours, classic intermittent fasting is more convenient than you think.

Depending on your daily routine, you can use this intermittent fasting method with a 14/10 or 18/6 schedule or even approach more extended periods. However, the most popular intermittent fasting schedule remains as follows:

  • Fasting window: 16 hours
  • Eating window: 8 hours

20/4 (Warrior Diet)

20/4 Intermittent Fasting Schedule (Warrior Diet)

The Warrior Diet is also a modification of the 16/8 fasting plan. It got its name from Ori Hofmekler, whom we can call a pioneer in intermittent fasting.

Finally, the Warrior Diet was one of the first popular diets that included a form of intermittent fasting.

On the 20/4 schedule, you fast throughout the day and feast bluntly in the evening within a 4-hour window.

Unlike other methods, you can eat small amounts of raw fruits, vegetables, and lean protein on the Warrior Diet during the 20-hour fasting period.

However, I would not recommend this snack interlude to anyone. Low-fat protein and carbohydrates stimulate insulin secretion, interrupting fat burning and autophagy.

Otherwise, food choices on the Warrior Fasting Protocol are related to the Paleo Diet. In any case, natural, unprocessed foods are a step in the right direction.

Hence, this intermittent fasting schedule is based on the idea that our ancestors hunted and gathered during the day and prepared a big meal at night.

Therefore, the 4-hour eating window in the Warrior Diet is in the evening. Furthermore, following a specific order when eating food makes perfect sense.

You first eat vegetables, protein, and fat on the Warrior Diet. Carbohydrates are only optional if you’re still hungry afterward.

  • Fasting window: 20 hours
  • Eating window: 4 hours

23/1 Intermittent Fasting (OMAD)

23/1 Intermittent Fasting Schedule (OMAD Diet)

One Meal A Day (OMAD) is not a diet but a more extreme form of the classic 16/8 intermittent fasting schedule. Limiting the eating window to one meal represents the step up from the Warrior diet.

Therefore, OMAD means that you only eat once a day and fast the rest of the day. With this in mind, OMAD is not the proper method for beginners.

Hence, OMAD can be a situational method for fasting with the 16/8 schedule for a while.

In my opinion, this is one of the most significant advantages of fasting. It’s tremendously flexible. If you are busy and just in the workflow, you skip lunch, gain time, and 16/8 becomes OMAD without additional effort.

Accordingly, OMAD is similar to 16/8 and 20/4 intermittent fasting, also called the 23/1 method or 23/1 diet.

Anyway, with the following schedule, OMAD is even simpler than 16/8 intermittent fasting:

  • Fasting window: 23 hours
  • Eating window: 1 hour

Crescendo Fasting

Crescendo Fasting Schedule

Unlike OMAD, the Crescendo Method is a weakened form of 16/8 Intermittent Fasting.

Instead of daily fasting, you fast on several days throughout the week. For example, this can be every odd working day: Monday, Wednesday, and Friday.

It is especially suitable for starting intermittent fasting. You can test how your body and hormonal balance react to the change.

For this reason, Crescendo Fasting is a popular beginner’s method for women. Provided you feel comfortable, you can gently approach the 16/8 intermittent fasting daily schedule.

  • Fasting window: 12-16 hours
  • Eating window: 8-12 hours

24-Hours Fasting (Eat-Stop-Eat)

24-Hour Fasting Schedule (Eat-Stop-Eat)

Another beginner-friendly option is to limit fasting to one day of the week.

24-hour fasting is also known as the Eat-Stop-Eat Schedule. Brad Pilon, another pioneer in intermittent fasting, is responsible for naming this method.

Eat-Stop-Eat has been a popular intermittent fasting daily plan for several years. It involves fasting once or twice a week for 24 hours. For the remaining time of the week, you eat as usual.

For example, you fast from 8 PM on Monday after dinner until you eat dinner again on Tuesday at 8 PM.

However, this schedule is flexible, so you can also fast from breakfast to breakfast or from lunch to lunch.

Unlike the common 5:2 intermittent fasting, no small snack is allowed in this schedule. With Eat-Stop-Eat, you always fast strictly, making it an effective method.

However, this is also a possible disadvantage of this fasting plan. Strict 24-hour fasting is difficult to achieve for many people – especially beginners.

Therefore, it makes sense to start with a shorter fasting window. You can comfortably begin with 14-16 hours and slowly work up to 24 hours.

As with other intermittent fasting schedules, the general rule is that natural, unprocessed foods with high nutrient density are essential during meal periods.

However, since a 24-hour fast may only have a night in the fasting window, you’ll still eat every day of the week.

While this may sound beneficial, there are some disadvantages. Finally, it is easiest to fast while sleeping. Therefore, we are tackling an intermittent fasting plan that uses this fact next.

The weekly Eat-Stop-Eat schedule is as follows:

  • Fasting window: 24 hours (1-2x)
  • Eating window: Rest of the week

36-Hours Fasting (6:1 Diet)

36-hour fasting schedule (6:1 diet)

It has enormous benefits if you can fit two nights into the fasting period. Ultimately, you are already sleeping about 16 hours of fasting, leaving only 20 hours to fast actively.

If you fast over two nights, the 1-day fast extends to a fasting period of at least 36 hours. For example, this corresponds to the time from dinner to breakfast the day after next.

Since you do not eat for an entire day, this schedule is called the 6:1 Diet. However, contrary to popular belief, I do not recommend eating snacks between meals.

This way, you can benefit more from the anti-aging effect of autophagy and burn body fat much more efficiently for energy. To nullify this effect with a snack cannot be the effort’s goal.

We will look closer at the 5:2 diet for more details on small meals during fasting.

Especially for athletes and people who don’t want to restrict themselves daily, a 36-hour or 1-day fast with the following schedule is a popular option on a rest day:

  • Fasting window: 36 hours
  • Eating window: rest of the week

5:2 Intermittent Fasting (Fast Diet)

5:2 Intermittent Fasting (Fast Diet)

In the standard version of the 5:2 Diet, calorie intake is limited to 500 calories per day for two days per week (two meals of 250 calories each).

You eat as usual for the remaining five days of the week. For example, you could eat only 500 calories daily on Tuesday and Friday and normally eat Wednesday through Sunday.

For this reason, in the 5:2 Diet, you practice 36-hour fasting with a small meal twice a week. Eventually, you are turning a 6:1 into a 5:2 plan.

Although it may seem easier to approach fasting with small meals initially, it destroys the results.

If the insulin level rises due to the meal, you inhibit fat burning, autophagy, and associated health benefits.

Moreover, small meals will not satiate but initiate cravings. This fact is especially actual with carbohydrate-based foods, which spike blood sugar.

Since the hunger hormone ghrelin decreases with fasting duration, it is wiser to fast without a snack (Natalucci et al. 200510).

It’s far better to fast strictly through the two days. This way, you give the digestive tract a break, cleanse the body, and burn body fat much more efficiently.

Fasting for two days is more efficient for cell renewal but unsuitable for beginners.

Moreover, if you do not eat for two days, you will have a fasting window of about 60 hours from dinner to breakfast.

Fasting periods longer than 48 hours are called prolonged fasting. You better apply such methods selectively than put the body weekly under additional stress.

Nevertheless, a strict version of the 5:2 Diet can significantly impact fat burning and autophagy if you are an experienced fasting enthusiast.

However, the typical 5:2 intermittent fasting schedule is composed as follows:

  • Fasting window: 2×1 days (small meals)
  • Eating window: 5 days a week

Alternate-Day Fasting (ADF)

Alternate Day Fasting (ADF)

This method is just as simple as it sounds – eat one day, fast one day.

However, most people eat a small meal (about 500 calories) on a fasting day. Therefore, although it is relatively widespread, this method is not a favorite of mine.

Not only does a small meal make you hungry, but it also negates the health benefits of autophagy.

In addition, Alternate Day Fasting (ADF) is more difficult for most people to incorporate into their daily routine than other plans.

In addition, many people abuse ADF because they think it allows them to maintain their Standard American Diet (SAD), which is dominated by refined carbohydrates.

That’s why this type of intermittent fasting is usually not successful. Because what you eat does matter a lot, even with intermittent fasting. Ultimately, it is always a matter of lowering the insulin level in the long term.

Moreover, poor-quality food can cause unpleasant side effects more quickly, making it challenging to stick to the fasting schedule.

Thus, the ADF plan is not at all suitable for beginners. However, this intermittent fasting schedule is also amazingly straightforward:

  • Fasting window: 24 hours (small meal)
  • Eating window: 24 hours

Spontaneous Meal Skipping

An intuitive approach to intermittent fasting is possible for different starting points.

On the one hand, it can be a gentle introduction to intermittent fasting before you get used to a more restrictive daily schedule.

On the other hand, with 16/8 intermittent fasting, for example, you can skip lunch and sniff out an OMAD schedule if you’re too busy for a meal.

Ultimately, intermittent fasting helps you regain a natural intuitive sense of when your body is craving food. You don’t have to force yourself to eat if you’re not hungry at lunch.

Most of our eating habits are learned and by no means need to reflect an optimum food intake.

Plus, cooking and eating take an enormous amount of time. Skipping meals gives you more time to do other things, like meeting friends or walking.

Spontaneously skipping meals effectively reinforces the widely held belief that we must eat three meals daily. Accordingly, you won’t starve to death if you skip a meal now and then!

Likewise, you won’t automatically overeat as soon as you eat afterward. These and other conventional concerns have already been debunked by science.

You can read more about this in my article on the top 10 intermittent fasting myths.

What Intermittent Fasting Schedule Is Best for Me?

Although approaches exist that fit most people, it’s perfectly reasonable to experiment initially.

After all, your body and daily schedule are unique, so it’s not always the same method that can best fit that routine.

For example, you can start slowly with a 12/12 day plan, as this is an effortless way to get started for most people.

You stop eating a few hours before bedtime and postpone breakfast for a few hours after waking up.

If that works well, extend the fasting window the next day and repeat the process until you arrive at a daily schedule that works for you.

Since you must subtract 8 hours of sleep, 12 to 16 hours is not long to wait for a meal. Accordingly, it’s easy to experiment with classic intermittent fasting, where you still eat daily.

Best Intermittent Fasting Schedule for Weight Loss

16/8 intermittent fasting is the go-to schedule for weight loss.

Weight loss is a matter of hormone balance. Specifically, the storage hormone insulin is essential in this process (Kong et al. 201311Meijssen et al. 200112).

Fasting is the most effective way to lower insulin levels, improve insulin sensitivity, lose weight, and prevent diabetes.

Once you get used to an intermittent fasting daily schedule, the hunger hormones adjust to the plan, and fasting should become almost effortless.

For example, the essential hunger hormone ghrelin decreases as the duration of fasting increases and only increases in a pulsatile manner when we expect a meal (Natalucci et al. 200513).

People with a fixed intermittent fasting schedule succeed more than people with irregular eating patterns.

Therefore, 16/8 intermittent fasting is the best schedule for most people to lose weight successfully.

The ease of use makes 16/8 a guarantee of success. You only have to cut out one meal and unnecessary snacks. Due to the beneficial hormonal balance in the morning, it is easiest to skip breakfast.

However, people can also achieve success by skipping dinner if it fits better into their daily routine.

16/8 intermittent fasting guarantees low insulin levels and does not drastically change your daily routine.

This balance results in most people sticking to their daily schedule. And finally, continuity is the key to results.

People overestimate the impact of working out. Sticking to a low-carb diet is far more critical to allow insulin levels to sink in the first place.

If you want to put the icing on the cake, you can integrate two short but intense weightlifting sessions into your weekly schedule.

They help empty carbohydrate stores and get you into ketosis, thus burning fat faster. For best results, train fasted. For details, read my article on intermittent fasting and exercise.

woman in plank position

Best Intermittent Fasting Schedule for Women

The crescendo method is the best beginner’s schedule for women. It is tailored to their needs.

Nature is interested in reproduction before anything else. Therefore, the female body always focuses on producing healthy offspring that survive and do the same.

From this evolutionary perspective, a woman’s situation is even more precarious than a man’s. Finally, periods of hunger or other stress can jeopardize the health of the offspring.

For this reason, female hormones are more sensitive to changes in diet and other external circumstances, so they can better adapt.

For example, the hunger hormone ghrelin can rise again more quickly after a meal in women than in men. Therefore, slightly shorter fasting windows of 12-14 hours instead of 16 often provide a more successful start for women.

For this reason, crescendo fasting is known as the starter plan for women. Here, you can approach your ideal fasting schedule in two dimensions.

On the one hand, you can gradually increase the fasting window of the daily plan from 12 to 14 to 16 hours. On the other hand, the weekly plan calls for intermittent fasting only every other day.

Furthermore, you can also increase this dimension slowly to a whole week. In addition, many women also successfully limit fasting to weekdays. That way, you’re not restricted on weekends when free time and social interactions are paramount.

However, continuity makes all the difference when it comes to losing weight. That’s why it’s a good idea to establish a fixed fasting window, at least on weekdays, after a one-month introductory phase.

With this in mind, choose your fasting window wisely so you can and will stick to it during your daily routine.

Best Intermittent Fasting Schedule for Men

Eat-Stop-Eat and 16/8 are the best intermittent fasting schedules for men.

In my experience, most men can start directly with a 16/8 fasting plan. Finally, you will unlearn your appetite in the morning in less than two weeks.

In addition, 24- or 36-hour fasting is also excellent for men, as they find it more accessible, on average, to fast for more extended periods at a time.

Those who are athletes and do not like to restrict themselves in everyday life are best served with 36-hour fasting. Because two nights lie in the fasting period, this method is feasible weekly and effective for health goals.

Men who have been engaged in intermittent fasting for a long time also tend to use more extreme methods more often.

People who travel a lot or have a physically active working day can optimize their health by skipping lunch.

So 16/8 becomes a 20/4 or OMAD fasting schedule. The daily routine must fit to increase the fasting window from 16 hours to 20 or more.

I practice OMAD to maximize productivity and free time. There is no question that lunch brings losses in concentration. Still, it has social benefits and may reduce stress during your working day.

The Takeaway

Intermittent fasting is more than just a weight-loss tool. As long as you practice it correctly, it is the simplest way to establish a healthy lifestyle.

Nevertheless, starting intermittent fasting successfully with every schedule is impossible.

For example, the 16/8 fasting plan is popular because it can realize health benefits while being simple and hardly restricting.

Nonetheless, even with intermittent fasting, the quality of your diet is crucial.

You won’t lose weight or improve your health if your eating window is filled with processed carbohydrate-rich foods.

Moreover, there are situations in which fasting is inappropriate. These include, in particular, times of pregnancy, breastfeeding, eating disorders, or chronic stress.

Furthermore, before you start fasting, consult the doctor you trust.

Frequently Asked Questions (FAQ)

What is the most ideal intermittent fasting schedule?

16/8 intermittent fasting is ideal for most people since it easily fits into many daily routines.

What is the best intermittent fasting schedule for fat loss?

Also, for weight loss, 16/8 is the best schedule since most people cannot stick to more extreme plans daily.

Is it better to fast for 12 or 16 hours?

Fasting for 16 hours has more impact since it allows your insulin levels to drop more significantly.

Is 16 8 or 18 6 better for intermittent fasting?

The 18/6 intermittent fasting schedule can yield better weight loss results but it is harder to stick to.



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Mag. Stephan Lederer, MSc.

Mag. Stephan Lederer, MSc. is an author and blogger from Austria who writes in-depth content about health and nutrition. His book series on Interval Fasting landed #1 on the bestseller list in the German Amazon marketplace in 15 categories.

Stephan is a true man of science, having earned multiple diplomas and master's degrees in various fields. He has made it his mission to bridge the gap between conventional wisdom and scientific knowledge. He precisely reviews the content and sources of this blog for currency and accuracy.

Click on the links above to visit his author and about me pages.

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