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Will 13 calories break my fast?

Fasting has become an increasingly popular health trend in recent years, with many people trying various methods for weight loss or other health benefits. One question that frequently comes up is whether consuming a small amount of calories will break the fast. Specifically, many people wonder if consuming 13 calories will break their fast or not. In this article, we’ll take a closer look at the science behind fasting and calorie consumption to answer this question once and for all.

Understanding Intermittent Fasting and Its Benefits

Intermittent fasting has become more popular than ever before, and for good reasons. This dieting method involves limiting the number of hours you eat, followed by a fasting period with no caloric intake. The practice has been shown to help with weight loss, improve heart health, reduce inflammation, and increase longevity.

What Happens to Your Body When You Fast

Fasting causes the body to go into a state of ketosis during which insulin levels lower, and the body switches from using glucose to stored fat for energy. This causes the body to burn fat, which can result in weight loss. Fasting also helps with the production of ketones, which are small molecules produced when fat is broken down for energy. The production of ketones can boost cognitive function and suppress hunger.

How to Start Your Fast

To start a fast, you begin by consuming all your calories within your eating window. Many people start with a 16/8 fast, where they consume all their calories within an eight-hour window and fast for the remaining 16 hours. However, intermittent fasting methods vary, and some people may opt for a shorter or longer eating window, depending on their needs.

What is Considered Breaking a Fast?

Breaking a fast occurs when any item consumed consumes an elevated insulin response. This insulin response can break your fast and prevent you from getting the full benefits of fasting. Anything consumed with over 50 calories, and elevated insulin levels will break your fast.

Will 13 Calories Break Your Fast?

The answer is, it depends. It is important to understand that the number of calories consumed is not a reliable indicator of whether or not you are breaking your fast. If the item consumed has an elevated insulin response, it will break your fast, even if it has zero calories.

Common Foods and Drinks That Will Break Your Fast

The following items are known to break a fast:

  • Sugar-based products (including honey)
  • Milk products
  • Alcohol
  • Juice or smoothies
  • Nutrition supplements and protein bars (most have added sugars)
  • Anything with additives or artificial sweeteners

What Foods and Drinks Can You Consume Without Breaking Your Fast?

Drinks and foods without any added sugar and having negligible insulin response levels can be used while fasting, including:

  • Water
  • Black coffee or tea
  • Herbal tea
  • Apple cider vinegar drinks
  • Non-caloric sweeteners like stevia


Whether or not 13 calories will break your fast is dependent on what you are consuming. It is always essential to understand the mechanisms and benefits of fasting before beginning any new diet. With intermittent fasting, start of shorter fasting periods so that you may adjust and feel comfortable in fasting. Pay attention to your body and fasting should be a pleasant and beneficial experience.

How Does Caloric Intake Affect Fasting?

When it comes to fasting, there are various schools of thought on what is considered ‘breaking the fast.’ One of the most commonly asked questions is whether or not consuming 13 calories during the fasting period will break it. To understand this, we need to learn how fasting works and what role caloric intake plays during the fast.

Understanding Fasting

Fasting is a practice that has been around for centuries and is a way of abstaining from food and/or drink for religious, spiritual, or health reasons. During a fast, your digestive system gets a break, and your body switches to burning stored energy (glycogen) for fuel.

Calories and Fasting

Caloric intake plays a vital role in any diet, including a fasting diet. In essence, consuming calories during a fast breaks the fast, and your body stops burning stored glycogen for fuel.

The Impact of Consuming 13 Calories During Fasting

Consuming 13 calories during fasting can impact your fasting period, but the extent of the impact can vary from one individual to another. Intermittent fasting, for instance, allows for a limited number of calories during the fasting period. The general rule of thumb is to consume fewer than 50 calories during the fasting window, and your body should continue burning glycogen for fuel.

However, consuming 13 calories during fasting can spike insulin levels, which can impact weight loss and other fasting benefits. Insulin responds to calories, and consuming calories during a fast can trigger an insulin response reducing the body’s ability to burn fat.

The Best Foods to Consume During Fasting

If you must consume calories, opt for nutrient-dense foods that offer essential vitamins, minerals, and other essential nutrients. Such foods include bone broth, green tea, and herbal tea.

Factors Affecting Caloric Intake During Fasting

Various factors can impact how your body responds to calories during a fast. These factors include your individual metabolism, the type of calories consumed, and the timing of consumption.

Breaking the Fast Too Early

Breaking your fast too early can impact your fasting period’s effectiveness, and you might miss out on the health benefits associated with fasting. If you lose track of time, chew gum, or consume calorie-containing beverages during fasting, your fasting period will be compromised.

How to Reduce the Effects of Consuming Calories During Fasting

If you consume calories during fasting, it’s important to consume them mindfully. Keeping caloric intake to a minimum helps keep insulin levels low while allowing your body to continue burning fat.

Final Thoughts

If you’re fasting for health or weight loss reasons, it’s crucial to stick to the fasting guidelines to achieve maximum benefits. Consuming 13 calories during a fasting period can impact your results, but the extent of the impact depends on several factors. Opt for nutrient-dense foods if you must consume calories and do so mindfully to keep your insulin levels low.

Bone broth

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Green Tea

Source: https://tse1.mm.bing.net/th?q=Green+tea&pid=Api&P=0&w=300&h=300

Herbal Tea

Source: https://tse1.mm.bing.net/th?q=Herbal+tea&pid=Api&P=0&w=300&h=300

Understanding the Impact of 13 Calories During Fasting

The Role of Calories During Fasting

During fasting, people often assume that abstaining from all forms of food and drink, including water, is necessary for the process. However, the human body requires energy intake to survive. Calories are units of energy that fuel the body’s functions. Therefore, it is essential to know how many calories break a fast.

The 13-Calorie Limit: Myth or Fact?

Many people believe that consuming 13 calories will break a fast. However, the idea of this calorie myth is unfounded. Some studies suggest that consuming 50 calories or less per day is unlikely to break your fast. It is essential to understand that the calorie limit allowed during fasting may vary depending on the nature of the fast and the individual’s health condition.

The Sources of 13 Calories During Fasting

It is crucial to pay attention to the sources of calories consumed during fasting. The calories in liquids and snacks can add up quickly, leading to the breaking of the fast. Some of the popular beverages that people often consume during fasting, such as coffee, tea, and bone broth, contain calories. Additionally, some types of supplements and medications may also contain calories.

The Impact of 13 Calories on Fasting Goals

Eating or drinking 13 calories can have a different impact on various fasting goals. For instance, 13 calories may be insignificant for those undertaking intermittent fasting for weight loss. However, individuals who fast for religious, spiritual, or health reasons may consider any form of calorie consumption as breaking the fast. In such cases, 13 calories can affect the psychological or spiritual benefits of fasting.


Understanding the role of calories during fasting is crucial for anyone planning to fast. Although the popular belief is that 13 calories or less would break a fast, the number of calories that can be allowed during fasting can vary depending on the individual and the type of fasting. It is always best to consult a healthcare professional before commencing any fast.

Sources of Calories during Fasting
Bone broth

13 calories break a fast

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That’s a wrap!

So there you have it, folks! A little sip of coffee or a stick of gum with 13 calories won’t break your fast, but it’s always best to stick to water and plain black coffee for optimal results. Remember to listen to your body and do what works best for you during your fasting journey. Thanks for tuning in and we hope to see you back soon for more informative reads!

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