Intermittent Fasting: What Breaks a Fast? (2024)

Intermittent Fasting: What Breaks a Fast? (1)

If you’re new to intermittent fasting, you may have a lot of questions about what to do while fasting*. Does coffee break a fast? What about diet soda, or tea? Can I eat a banana? Or a handful of almonds? What if I’m really hungry? Read on to discover what really breaks a fast, and how to curb hunger while intermittent fasting for greater success.

What Breaks a Fast?

Strictly speaking: any amount of calories, no matter how small, disrupts the fasting process. If you’re following your intermittent fasting plan to the letter, that means no calories, whatsoever, for the entirety of your fasting window. In order to preserve the benefits of intermittent fasting—burning fat for fuel, controlled blood sugar levels, etc. 1 —it is not generally recommended to consume anything other than a few select beverages during the fasting window.

What Can YouDrink While Fasting?

While eating is definitely off the table while in your fasting window, many people find success with a variety of beverages that can help preserve the benefits of fasting while simultaneously curbing hunger pangs. Here’s a rundown of a few of the most common:

  • Water.

    Staying hydrated is the most important component to a successful fast. Choose still or sparkling, but be sure to check the label on flavored water, which may have hidden carbs.

  • Coffee and tea.

    If you can’t imagine your mornings without a cup of coffee or tea, don’t fret! Black coffee and tea contain so few calories (3 calories and 2 calories, respectively; though tea varieties may vary) that you may find they don’t impact your fast at all. Or, you may find that the benefits outweigh the negligible calories. Just be careful to reach for low carb and calorie creamers and sweeteners, if at all.

  • Broth.

    While broth will technically break your fast, it contains high levels of necessary sodium and other minerals, which helps your body replenish electrolytes and stay hydrated while also fighting off hunger pangs. 2 Most broths also contain very few calories (1/2 cup bone broth contains ~15 calories.)

What Can You Eat While Fasting?

As previously stated, any amount of calories will, technically, break your fast.Even foods with extremely low calories, like celery, still contain fiber and other nutrients that could potentially trigger your body’s digestive process.It’s also possible that the effect of chewing may get your digestive system working, which will actually make you feel hungrier. Therefore, it is not generally recommended to eat during the fasting window.

However, everyone is different, and you should always find what works and feels best for you. What’s key to any weight loss plan—and essential to learning how to curb hunger during intermittent fasting—is consistency. If a small boost helps you see your fasting window through to the finish, and to start fasting again when scheduled, then go for it! And, as always, if you’re feeling faint or ill, you should listen to your body and eat or drink when needed.

Plus, even if your body is no longer in fasting mode, you can still benefit from some of its processes; fat-burning ketosis, for example, still occurs after feeding, so long as you remain under 50 grams of carbs per day. 3 Keeping your blood sugar levels stable is also possible after fasting; just stick with low carb foods to avoid spiking your blood sugar, and keep your body in fat-burning mode. Ultimately, what’s important about intermittent fasting is finding the right tools that help you stick to your routine, rather than preserving the technicality of the fast.

* Before starting IF, consult with your doctor or healthcare provider for guidance on whether IF is right for you.

Further Reading
PubMed Central, National Library of Medicine, 2022: A scoping review of intermittent fasting, chronobiology, and metabolism

Chronobiology plays a crucial role in modulating many physiologic systems in which there is nutritional synergism with meal timing. Given that intermittent fasting (IF) has grown as a flexible dietary method consisting of delayed or early eating windows, this scoping review addresses the effects of IF protocols on metabolism as they relate to clinical nutrition and the circadian system…

Evidence Based
PubMed Central, National Library of Medicine, 2005: Soup and satiety

Energy-yielding fluids generally have lower satiety value than solid foods. However, despite high water content, soups reportedly are satiating. The mechanisms contributing to this property have not been identified and were the focus of this study…

Evidence Based
PubMed Central, National Library of Medicine, 2021: Alternative Dietary Patterns for Americans: Low-Carbohydrate Diets

The decades-long dietary experiment embodied in the Dietary Guidelines for Americans (DGA) focused on limiting fat, especially saturated fat, and higher carbohydrate intake has coincided with rapidly escalating epidemics of obesity and type 2 diabetes (T2D) that are contributing to the progression of cardiovascular disease (CVD) and other diet-related chronic diseases…

Intermittent Fasting: What Breaks a Fast? (2024)

FAQs

Intermittent Fasting: What Breaks a Fast? ›

Technically, fasting means refraining from having any kind of food—so, as a result, any amount of calories will technically break a fast, says dietitian Scott Keatley, RD, of Keatley Medical Nutrition Therapy.

What breaks a fast in intermittent fasting? ›

Technically speaking, eating or drinking any calories breaks a fast. That means it's generally considered OK to drink black, unsweetened coffee or tea, as well as water.

What happens if you eat something small during intermittent fasting? ›

Strictly speaking: any amount of calories, no matter how small, disrupts the fasting process. If you're following your intermittent fasting plan to the letter, that means no calories, whatsoever, for the entirety of your fasting window.

Can I eat whatever I want while intermittent fasting and still lose weight? ›

It's not a diet, so unless you have individual dietary restrictions, you can eat whatever you want within the eight-hour time frame. But the plan will work best for weight loss if you are already making smart, nutrient-rich choices, said NBC News health and nutrition editor Madelyn Fernstrom, Ph.

Will 10 calories break a fast? ›

Strictly speaking, any amount of calories will break a fast. If a person follows a strict fasting schedule, they should avoid any food or drinks containing calories. Those following a modified fasting diet can often eat up to 25% of their daily calorie needs while fasting.

Do eggs break a fast on intermittent fasting? ›

No matter whether you enjoy them scrambled, boiled, or even cooked in an omelet, eggs can be a fantastic food to choose when breaking a fast. They are packed with high-quality protein, are relatively easy to tolerate, and are a nutritional powerhouse.

What is the best intermittent fasting window to lose belly fat? ›

Best Intermittent Fasting Method For Visceral Belly Fat

14/10 Method: Fast for 14 hours and have a 10-hour eating window daily. That means you restrict your food intake to a specific 10-hour period while abstaining from caloric consumption for the remaining 14 hours.

Does chewing gum break a fast? ›

Generally, chewing gum that contains sugar or calories can technically break a fast because it stimulates the digestive system and may trigger an insulin response.

What foods won't break a fast? ›

Foods and beverages that do not break a fast include water, black coffee, unsweetened tea, and diluted apple cider vinegar.

Why am I not losing weight on 16:8 fasting? ›

If you've tried intermittent fasting but aren't losing weight, possible reasons why include overeating during your eating window and poor food choices. To help, you can try eating fewer calories, work on balancing your meals, or create a smaller or larger eating window.

How to speed up weight loss on intermittent fasting? ›

A person needs to decide on and adhere to a 12-hour fasting window every day. According to some researchers, fasting for 10–16 hours can cause the body to turn its fat stores into energy, which releases ketones into the bloodstream. This should encourage weight loss.

Why you shouldn't do intermittent fasting everyday? ›

Longer periods without food, such as 24-, 36-, 48- and 72-hour fasting periods, are not necessarily better for you, and may be dangerous. Going too long without eating might actually encourage your body to start storing more fat in response to starvation.

Do vitamins break a fast? ›

Final takeaways. In general, taking vitamins doesn't break a fast. However, taking certain vitamins – including gummy vitamins, or other vitamins containing calories – can break your fasted state. Fasting boasts a number of health benefits and is sometimes undertaken for spiritual and religious reasons.

Is anything allowed during intermittent fasting? ›

No food is allowed during the fasting period, but you can drink water, coffee, tea, and other noncaloric beverages. Some forms of intermittent fasting allow small amounts of low calorie foods during the fasting period. Taking supplements is generally allowed while fasting, as long as there are no calories in them.

Will 30 calories break a fast? ›

Technically, fasting means refraining from having any kind of food—so, as a result, any amount of calories will technically break a fast, says dietitian Scott Keatley, RD, of Keatley Medical Nutrition Therapy.

Does brushing teeth break fast? ›

Well, the general consensus is that it's perfectly fine to brush your teeth as long as you're not swallowing the toothpaste. This is because some toothpastes can contain artificial sweeteners, which can set off an insulin reaction.

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