10 Intermittent Fasting Rules for Stunning Results

Dieser Artikel basiert auf wissenschaftlichen Studien

Intermittent Fasting | Methods | Weight Loss | Rules | FAQ | Studies

Most people come across intermittent fasting because they want to achieve sustainable weight loss results. Nevertheless, the health benefits of intermittent fasting go far beyond that.

When used correctly, intermittent fasting improves digestion, gut health, life expectancy, and muscle gain.

Unfortunately, most people fail to achieve these successes due to subtle mistakes. With these ten rules for intermittent fasting, that can’t happen to you!

What Are Intermittent Fasting Rules?

Intermittent fasting is an eating pattern that alternates between periods of eating and fasting.

Although there are different methods and rules for intermittent fasting, eating within a window of around 8 hours is the most popular method.

In this sense, this means that 16/8 intermittent fasting involves fasting for 16 hours per day. Nonetheless, you can also fast for 14, 18, or 20 hours daily, as we will cover later.

It has recently gained popularity because intermittent fasting is associated with health benefits such as increased insulin sensitivity or weight loss (Halberg et al. 20051).

Since intermittent fasting is a broad and flexible term, various methods and rules exist, but this is not necessarily a disadvantage.

Thanks to the flexibility of intermittent fasting, you can tailor your eating habits around your daily routine. Only in this way can you achieve long-term results with intermittent fasting.

Nevertheless, different methods have individual rules and advantages and disadvantages. Therefore, let’s determine which intermittent fasting plan suits your everyday life.

16/8 Intermittent Fasting

The 16/8 method, also known as the peak fasting or lean gains method, allows you to gain muscle while losing body fat.

In this method, you eat between 12 and 8 pm. For this reason, your digestive tract can rest for the remaining 16 hours. After you sleep 8 of the 16 fasting hours, 16/8 intermittent fasting is easier than you might think.

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

Crescendo Method

The Crescendo Method is a softer form of 16/8 Intermittent Fasting.

Instead of fasting daily, you fast several days throughout the week, for example, Monday, Wednesday, and Friday.

It is especially suitable for starting intermittent fasting. You can determine how your body and hormonal balance react to the change. You can move on to the 16/8 intermittent fasting plan if you feel comfortable.

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

Alternate Day Fasting (ADF)

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

However, most people do this by eating a small meal of about 500 calories on a fasting day.

Not only does a small meal make you hungry, but it also negates the health benefits of fasting. Additionally, the insulin release caused by the meal stops fat loss (Meijssen et al. 20012).

For this reason, I would not advise this method.

In addition, ADF is more difficult for many people to integrate into their daily routine than other methods.

  • Fasting window: 12-16 hours
  • Eating window: 8-12 hours
Sufficient drinking is among the essential intermittent fasting rules

24-Hour-Fasting or 6:1 Diet

The better version of ADF is 24-hour fasting. Here you do not eat at all on one day of the week and drink only water, coffee, or tea (without additives).

Since you usually fast for two nights, fasting often lasts longer than 24 hours. From dinner to breakfast the day after next, it is usually 36 hours.

You can benefit more from the anti-aging effect of autophagy and burn body fat much more efficiently for energy.

Especially for athletes and people who don’t want to restrict themselves daily, 1-day fasting is a popular option on a rest day.

  • Fasting window: 24-40 hours
  • Eating window: Rest of the week

48-Hour-Fasting or 5:2 Diet

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

For the remaining five days of the week, you usually eat. For example, you might eat only 500 calories daily on Monday and Tuesday and typically on Wednesday through Sunday.

The body can no longer break down fat if the insulin level rises due to the meal.

Moreover, fasting periods of 48+ hours are better used selectively as therapeutic fasting methods than to put the body under stress with them every week.

  • Fasting window: 48 hours (with small meals)
  • Eating window: 5 days a week

One Meal A Day (OMAD)

OMAD is a more extreme form of the classic 16/8 method.

Therefore, One Meal A Day means nothing more than 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.

Therefore, I see OMAD as a situational method for people who have already practiced 16/8 for a longer time. If it fits into your daily routine, you skip another meal.

Accordingly, OMAD is similar to 16/8, called the 23/1 fasting or 23/1 diet.

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

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

Do We Need Intermittent Fasting Rules for Weight Loss?

Intermittent fasting for weight loss sounds very simple. For example, standard 16/8 intermittent fasting has just two rules:

  • No breakfast
  • No snacks

But even simple concepts hide complex relationships.

You’ve probably read about countless intermittent fasting success stories. You’ve done your research, tried things out, and still aren’t convinced?

Achieving lasting success with intermittent fasting comes down to supposed subtleties.

This article sets up rules for intermittent fasting that reach the heart of all the crucial principles. If you don’t know this basic information, you will not lose weight with intermittent fasting.

In addition, people need clear rules to keep in mind to bring the necessary continuity into their daily lives.

Top 10 Intermittent Fasting Rules to Get You Results

Here are the top ten rules for intermittent fasting beyond the usual “listen to your body.”

Reflecting the basic principles of years of experience, this concise set of rules has provided beginners and experts with lasting success in intermittent fasting.

1. What You Eat Matters

Many people abuse intermittent fasting to maintain their habitual Western diet, which is dominated by refined carbohydrates.

However, what you eat makes a big difference, even with intermittent fasting.

People especially like to lie to themselves with alternate-day fasting. Perhaps you, too, have acquaintances who practice this method in exchange for stuffing themselves with low-nutrient, high-carbohydrate foods.

Nonetheless, intermittent fasting revolves around two effects:

  • Fat burning
  • Sustainable health

People tend to forget that research has shown that both goals depend on hormone balance.

When the storage hormone insulin is too high, the body can neither cleanse itself through autophagy nor break down stored fat (Levine et al. 20173; Meijssen et al. 20014).

For this reason, the desired results fail to materialize when people use intermittent fasting to cheat.

In addition, the constant switch between sugar and fat metabolism also brings physical side effects, such as headaches or diarrhea.

2. Intermittent Fasting Is Not a Diet

Diets have been failing consistently for 50 years. Their lowest common denominator? Calorie counting!

However, the masses have learned little from it to this day.

An empirical study from the United Kingdom shows that 99.5 percent of 99,791 women and 76,704 men failed to lose weight successfully through conventional calorie reduction despite being overweight (Fildes et al. 20155).

While calorie balance does impact weight loss, hormonal pathways must first be set to allow fat burning to occur in the first place.

For example, scientists can now predict up to 75% possible gain and loss in overweight people using insulin levels (Kong et al. 20136).

Are you wondering about the most effective way to lower the storage hormone? It’s fasting.

After a strict fasting period, where you don’t trigger insulin production, insulin levels drop, so you can burn more fat while maintaining your calorie intake throughout the day.

As long as you don’t cheat, intermittent fasting will give you enough daily calories to lose weight. For a woman, that’s about 1,900 kcal per day.

However, this does not mean that you will necessarily eat less. Instead, you fetch your nutrients in fewer but larger meals.

According to studies, people who eat fewer meals consume fewer calories during the day, making them more likely to fall short of their daily requirements (Stubbs et al. 20017).

However, you are still responsible for the quality of your food. If your diet is based on baked goods, pasta, and other refined carbohydrates, hours will pass before the body can burn fat again.

3. Eating Habits Can Be Unlearned

Over the years, we have learned to feel hungry at certain times.

This fact is especially actual for snacks and breakfast. Contrary to popular belief, breakfast is only the most critical meal for the food industry.

In our society, skipping breakfast is almost considered a crime, even if we are not hungry.

But otherwise, we lack energy for the day, don’t we?

Not really. We wake up at peak levels of adrenaline, glucagon, growth hormone, and cortisol, which provide enough energy to start the day.

Therefore, at no other time in the day are we more energized than after we wake up.

Nevertheless, you can also successfully do Intermittent Fasting by skipping dinner. The great advantage of Intermittent Fasting is that you can build it around your daily routine.

If it fits you and doesn’t cause you stress, according to my experience, the successes with intermittent fasting are the greatest. Ultimately, the whole package has to fit a happy personal life.

No matter your daily routine, you will have to unlearn the hunger for snacks to achieve success. Neither anyone needs a snack before noon nor in the afternoon.

Either way, you’ll only become more sluggish and unproductive – wasting valuable time.

Although this may sound challenging, even morning hunger is unlearned in two weeks. Yet consistency is the key to success.

Regardless of which eating window you choose, you will only eat during this time.

However, after this eating habit can be learned, your new eating times will become frighteningly regular.

People skip breakfast due to intermittent fasting rules

4. Low-Carb and Keto Improve Results

Low-carb and ketogenic diets act as an after-burner on intermittent fasting.


Intermittent fasting and keto aim to lower insulin levels, empty carbohydrate stores, and enter ketosis.

In this process, your body draws energy preferentially from glycogen stores in the liver, kidneys, and muscles. Once these carbohydrate stores are empty, the body must turn to stored fat for energy.

This fat-burning process is called ketosis and is a natural mechanism that once ensured our survival.

For this reason, the body builds up fat stores during times of abundance to draw on them during a food shortage, such as fasting.

You lose weight as soon as your body burns its fat for energy. When this happens is individual and depends mainly on your diet.

If your carbohydrate stores are full at the beginning of the fast, you won’t lose a gram of fat in the next 24 hours, as they cover your daily requirements.

Depending on your body size, these glycogen stores can hold 1700-2200 calories. For this reason, intermittent fasting works better with a low-carb or keto diet.

If you are already in nutritional ketosis, the body can quickly switch back to burning fat after eating.

Likewise, exercise helps get you into ketosis faster by drawing energy from glycogen stores.

5. Do Not Fear the Shaker

When emptying glycogen stores, the body loses plenty of water. There are about 3 grams of water bound to each gram of carbohydrate.

Therefore, especially when you start intermittent fasting or a ketogenic diet, the body flushes out plenty of electrolytes with water.

As a result, sodium deficiency, in particular, leads to headaches and dizziness.

Although salt has been demonized for decades, we cannot live without sodium. In contrast to the daily requirement of two grams recommended by authorities, our ancestors instinctively consumed 2-3 times as much sodium.

Furthermore, it is the country with the highest salt consumption with the lowest cardiovascular disease rates (Park et al. 20168).

In addition, salt is the natural antagonist of sugar. It takes the bitter taste out of food and counteracts cravings.

Unlike sugar, salt also has a negative feedback loop. The more salt the body gets, the less it craves.

While sugar consumption promotes insulin resistance and body fat storage, salt increases insulin sensitivity and helps weight loss (Sakuyama et al. 20169).

The best options for adding natural salt to your diet are pink Himalayan salt or Celtic sea salt.

So dare to salt as you wish during Intermittent Fasting! Your body will thank you for it.

6. Stay Hydrated

During intermittent fasting, the body loses more water due to the depletion of glycogen stores.

Therefore, it is essential to drink enough to prevent dehydration and headaches. In addition, there are other reasons for increased fluid intake.

For example, people tend to confuse thirst with hunger during intermittent fasting. When we give up habitual snacks, the body also lacks the fluids they had given us.

Accordingly, you often don’t crave food but have a hidden desire for fluids. However, how much you should drink per day cannot be generalized.

No utopian recommendations of 5 liters of water per day apply to everyone, nor can water requirements be calculated based on body weight, size, or age.

Therefore, a simple rule of thumb applies: Drink when thirsty. In addition, it makes sense to drink tea or a glass of water when the hunter arises. If the hunger subsides after half an hour, you are just thirsty.

However, you don’t have to force yourself to drink constantly if you’re not thirsty.

When in doubt, a glass of water or tea won’t hurt. With more extended periods of fasting and experience, you will get a better sense of when you are thirsty.

Since carbohydrates bind water in the body, a low-carb approach also makes sense from this perspective.

If you eat, e.g., bread, cookies, or cereal bars between fasting periods, water is stored, flushed out again along with sodium, and causes headaches.

With this in mind, my tip is to drink mineral water during intermittent fasting. Highly mineralized natural water can give you the electrolytes you lose during fasting.

You will find information about sodium, potassium, magnesium, calcium, and chloride on the label of good mineral water.

7. Do Not Put Milk in Your Coffee

When drinking water, coffee, or tea, mistakes repeatedly happen during intermittent fasting, which clear rules can prevent. In the end, many beginners usually lack reliable information.

Thus, many fasting beginners get carried away and add milk or sugar to their black coffee.

But these subtle little things can have significant effects. By raising blood sugar and insulin levels, they break the fast. So, time and time again, a good portion of the health benefits and progress in losing weight are negated.

For example, ketogenic diet followers also tend to forget that Bulletproof Coffee breaks the fast.

So while butter, coconut, or MCT oil in coffee helps with hunger between meals, it prevents the full health benefits of fasting.

Finally, you must burn the fat from Bulletproof Coffee before the body enters its fat stores.

Although bone broth is also a prime source of electrolytes and fat, it, too, technically breaks the fast and should only be used as a jump start. Once you get used to intermittent fasting, it’s just as taboo as Bulletproof Coffee.

Furthermore, many people don’t realize that while light and zero drinks are sugar-free, they can still break the fast.

diet soda ruins your results

8. Stay Away From Sweeteners

Sugar-free light drinks are popular not only for diets but in general. Nevertheless, it is these drinks that prevent success in intermittent fasting.

Contrary to the advertising message, zero sugar does not stand for fat burning in reality.

Although sweeteners such as aspartame and stevia do not increase blood sugar levels, they can stimulate insulin secretion (Anton et al. 201010).

Moreover, they erase gut bacteria that guarantee our health (Ruiz-Ojeda und Plaza-Díaz 201911).

Because sugar-free drinks hardly increase blood sugar levels, they trigger cravings for sweets in the brain. Therefore, sweeteners make people hungrier than conventional sugar (Yang 201012).

People who consume diet products like water are more often overweight, a proven fact.

Accordingly, researchers at the University of Texas at San Antonio found that consuming light beverages increases the likelihood of weight gain by 47 percent (Fowler et al. 200813).

During the fasting period, fluid intake is essential. However, it should be limited to water, mineral water, tea, and coffee without additives.

On the one hand, diet sodas break the fast. On the other hand, they will push your goals further away, even during eating periods.

9. Fasting Must Not Be Stressful

Stress is a significant factor that tends to be overlooked in intermittent fasting. When stress levels are too high, it often happens that weight stagnates.

After being exposed to psychological stressors regularly, the body releases cortisol more often than is healthy for us.

Cortisol is the crucial steroid hormone for the body’s effective stress response.

For this reason, cortisol has been evolutionarily essential to prepare the body for fight or flight. For example, to escape the threat of an onrushing wild animal.

After cortisol is released, blood sugar rises. In short, the body mobilizes energy to escape danger as quickly as possible (Owen et. al 197314).

Since elevated blood glucose increases insulin secretion, cortisol can indirectly inhibit fat burning.

For this reason, prolonged stress promotes weight gain, insulin resistance, and diabetes in the long run (Rizza et al. 198215).

After it is one of the crucial rules that your stress does not increase, your intermittent fasting plan must also fit into your daily routine.

The primary advantage of intermittent fasting is the degree of flexibility. If you have a busy calendar and no time to prepare an authentic meal, skip it.

While I prefer to skip breakfast, it may mean less stress for you to skip dinner. Some of my readers get the most results by eating only at lunchtime.

Ultimately, fasting is about less, not more. No longer dividing your day by fixed meals can be liberating and mean less stress.

10. You Don’t Have to Take It Easy

A popular myth about intermittent fasting is that you must take it easy.

If you’re already tired, the surest way into sluggishness is to rest even more. Instead, activities can help your body go fat-burning faster.

If you feel fatigued while fasting, it’s usually a sign that your carbohydrate stores are emptying. However, this is not a bad thing.

The body is telling us that readily available energy is running low by feeling sluggish. And that’s precisely what we want to achieve.

Nevertheless, the body does not immediately expend extra metabolic energy to burn fat, especially if you have just started fasting.

Accordingly, body fat is like a savings account. You only withdraw from it when the checking account (carbohydrate store) is empty.

That’s why it helps to increase your energy needs with exercise. This way, you force your body to switch to burning body fat for energy.

Nonetheless, when fasting, it is crucial to listen to your body. If you feel good about fasting and strength training, there is nothing wrong with it.

If you feel unwell, you can always break the fast.

For example, gaining muscle on intermittent fasting works excellently since it amplifies growth hormone secretion.

The golden rule is to exercise in a fasted state to maximize fat burning.

Eating before exercising increases insulin levels, hindering fat burning (Meijssen et al. 200116).

The Takeaway

The timing of eating is the most critical factor in losing weight, and it has been overlooked for decades.

Anyone who still believes that eating many small meals a day helps with weight loss is far from the reality of science.

Accordingly, studies confirm that people who eat snacks eat more daily (Stubbs et al. 200117).

In addition, it is a fact that snacks do not help with weight loss (Cameron et al. 201018).

You need clear rules to reap the myriad health benefits of intermittent fasting. Ultimately, fasting means not just going without sporadically.

The simple approach quickly becomes complex.

Using these rules as a guide, you can find your path to intermittent fasting and achieve visible success.

Frequently Asked Questions (FAQ)

What are the basic rules of intermittent fasting?

The most basic intermittent fasting rule is to skip breakfast and snacks.

Do and don'ts during intermittent fasting?

While prioritizing hydration, don’t put milk in your coffee during intermittent fasting.

What is the best intermittent fasting rule?

The most simple and effective intermittent fasting rule is to skip breakfast.

What is the first rule of intermittent fasting?

The first rule of intermittent fasting is that what you eat still matters.



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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.

This Post Has 2 Comments

  1. Greg

    Is there a vitamin you can take during the fasting period?

    1. Hi Greg,

      Thanks for the question!

      Vitamin supplements technically break a fast. Why not take them during the eating window? Lastly, we are talking about intermittent fasting, and our bodies are built to store nutrients – there is no need for a constant supply.


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