What Can You Drink While Fasting? Beverages and Drinks it’s OK to Consume During Intermittent Fasting

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David Lee

What Can You Drink While Fasting

Intermittent fasting has emerged as a transformative approach to eating that rhythmically alternates between periods of consuming food and abstaining from it. Its rise to prominence is buoyed by a confluence of benefits touted by health enthusiasts and scientific studies alike, ranging from weight loss and improved metabolic health to enhanced cognitive function.

Within the framework of intermittent fasting, the liquids we ingest play a pivotal role. While the primary rule is to avoid any caloric intake during the fasting window, not all drinks will break your fast. In fact, certain beverages are not only permissible but can also augment the fasting experience by promoting hydration, satiety, and even metabolic activity.

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Intermittent fasting is an eating pattern where you cycle between periods of eating and not eating (fasting). It’s not about which foods to eat, but rather when you should eat them. The idea is to fast for certain hours of the day or days of the week, and then eat normally during other times. This approach can lead to various health benefits and is often used for weight loss, improving metabolic health, and sometimes for convenience.

Understanding the nuances of what you can drink is instrumental in maintaining the integrity of your fast. This knowledge ensures that you reap the full spectrum of benefits without inadvertently disrupting the physiological state that fasting aims to induce. As we navigate through the intricacies of intermittent fasting, we’ll cast a spotlight on those drinks that are allies in your journey, helping you to sustain your fast effectively and comfortably.

The Basics of Intermittent Fasting and Beverage Consumption

Definition of Intermittent Fasting and Common Fasting Windows

Intermittent fasting is a dietary pattern characterized by alternating cycles of eating and fasting. Unlike traditional diets that focus on what to eat, intermittent fasting is all about when to eat. Common fasting windows include the 16/8 method, which involves 16 hours of fasting followed by an 8-hour eating window, and the 5:2 approach, where you eat normally for five days and restrict calories for two non-consecutive days each week. These periods are designed to trigger beneficial physiological responses in the body.

General Guidelines on Beverage Consumption During Fasting

When you’re in a fasting state, the goal is to minimize caloric intake to keep the body in a state of fasting. This means that the beverages you choose should ideally be calorie-free or very low in calories. Hydration is crucial, so water, both still and sparkling, is your best companion. Unsweetened tea and coffee are also generally considered acceptable, as they contain minimal calories and can help curb appetite while providing a comforting warmth or a refreshing break in your day.

The Role of Autophagy, Insulin Levels, and Calorie Intake

During fasting, several important biological processes take place. Autophagy, a cellular “cleanup” mechanism, is enhanced, which may contribute to improved cellular health and function. Meanwhile, insulin levels, which rise in response to eating, remain low during fasting. This can improve insulin sensitivity over time. Caloric intake is the primary trigger for insulin release, so keeping it to a minimum during fasting is key to achieving the desired hormonal and metabolic responses.

By understanding these concepts, you can make informed choices about what to drink during your fasting windows, ensuring that your efforts contribute positively towards your health goals.

Beverages You Can Drink While Fasting

Water: Still and Sparkling

Water is the quintessential drink of choice during intermittent fasting. It’s calorie-free, hydrating, and essential for maintaining the body’s normal functions, including the health of cells, tissues, and organs.

Hydration is particularly significant during fasting because it can help manage feelings of hunger, maintain energy levels, and support metabolic processes.

  • Still Water: Pure water is always the best hydration choice.
  • Sparkling Water: Carbonated water without added sugars or artificial sweeteners can offer a more satisfying alternative for those who prefer a fizzy sensation.

Tea: Herbal, Green, Black, and White Teas Without Additives

Tea is a fasting-friendly beverage as long as it’s consumed without added sweeteners or milk. The variety of teas available can provide a soothing or refreshing experience without compromising your fast.

  • Herbal Tea: Typically caffeine-free and can be enjoyed at any time of the day or night.
  • Green, Black, and White Teas: These contain caffeine, which can have a mild appetite-suppressing effect, making it easier to maintain the fast. Additionally, caffeine has been shown to promote autophagy, the body’s process of cleaning out damaged cells and regenerating new ones, which is one of the benefits of fasting.

Coffee: Black Coffee and Its Impact on Appetite

Black coffee is another staple for many fasters. The key is to consume it without any added calories from sugar, milk, or cream.

  • Appetite Suppression: The caffeine in coffee may help suppress your appetite, making the fasting periods more manageable.
  • Caffeine and Autophagy: As with tea, the caffeine in coffee can also stimulate autophagy.

Apple Cider Vinegar: Diluted Apple Cider Vinegar and Its Potential Benefits

Apple cider vinegar is often credited with health benefits ranging from improved digestion to better blood sugar control. When diluted with water, it can be consumed during fasting without breaking it.

  • Potential Benefits: Its acetic acid content may help with glycemic control, although the evidence is not conclusive.

Bone Broth: Nutrient Content and Its Controversial Standing in the Fasting Community

Bone broth is a nutrient-rich liquid containing minerals and collagen. It’s a topic of debate in fasting circles due to its calorie content.

  • Nutrient Content: While not calorie-free, it is low in calories and can provide minerals that may support hydration and satiety.
  • Controversy: Some purists argue that because it contains calories, it should be avoided during fasting. Others suggest that its nutrient density and benefits to gut health make it a worthy exception, especially during longer fasts.

Each of these beverages can serve a purpose during your fasting window, whether it’s to hydrate, suppress appetite, or provide a comforting ritual that makes fasting more enjoyable. The key is to ensure that what you’re drinking doesn’t contain significant calories that would lead to an insulin response and break the fast.

Beverages to Avoid During Fasting Periods

Sweetened Beverages and Their Effect on Insulin

Beverages to Avoid During Fasting Periods

Sweetened beverages, including diet sodas, sweetened teas, and energy drinks, are high in sugar and therefore high in calories. Consuming these drinks can cause a spike in blood sugar levels, which in turn leads to an insulin response. Insulin is the hormone responsible for signaling cells to absorb sugar from the bloodstream for energy or storage. During fasting, the goal is to keep insulin levels low to maximize fat burning and to benefit from the cellular repair processes that occur. Therefore, sweetened beverages are counterproductive to these fasting goals and should be avoided.

Alcoholic Drinks and Their Impact on Liver Metabolism

Alcohol consumption during a fasting period is particularly disruptive. The liver, which plays a crucial role in detoxifying the body, metabolizing drugs, and processing nutrients, prioritizes breaking down alcohol over other metabolic processes. This means that the liver’s ability to manage fat metabolism is significantly reduced while it’s busy processing alcohol. Moreover, alcohol can have an inhibitory effect on the central nervous system and impact blood sugar levels, both of which are contrary to the objectives of fasting. Additionally, alcoholic beverages can be quite calorie-dense, further breaking the fast.

High-Calorie Drinks That Can Break a Fast

Fasting is intended to create a caloric deficit that your body can use to turn to its fat stores for energy. However, drinks that are high in calories—like full-fat dairy products, store-bought smoothies, and commercial protein shakes—can quickly exceed the caloric threshold that maintains a fasting state, thus ending the fast. Consuming high-calorie drinks can cause an insulin spike, which not only breaks the fast but also halts the process of ketosis, a metabolic state in which the body burns fat for fuel in the absence of glucose from food.

When observing intermittent fasting, it’s essential to be mindful of all sources of calories, liquid or otherwise. By avoiding the aforementioned beverages, you ensure that your fasting period remains intact and that you continue to benefit from the metabolic switch that intermittent fasting aims to achieve.High-calorie drinks that can break a fast

Understanding Zero-Calorie Drinks

Artificial Sweeteners and Their Possible Effects on Insulin Response

Zero-calorie drinks often contain artificial sweeteners to provide a sweet taste without the added calories that come from sugar. However, the body’s response to these sweeteners can be complex. Some research suggests that artificial sweeteners may still trigger an insulin response despite their lack of calories. The sweet taste alone can potentially signal the body to release insulin in anticipation of sugar, a phenomenon known as the cephalic phase insulin response.

Additionally, artificial sweeteners may affect the gut microbiota and potentially alter glucose metabolism, leading to an inconsistent impact on insulin and blood sugar levels. Due to these potential effects, individuals who fast for blood sugar control or insulin sensitivity may choose to consume these sweeteners cautiously or avoid them altogether during their fasting windows.

Zero-Calorie Electrolyte Drinks and Their Suitability for Fasting

Electrolyte drinks can be beneficial during fasting, especially prolonged fasting or when engaging in physical activity, as they help replenish the electrolytes lost through sweat and maintain hydration. Zero-calorie electrolyte drinks that do not contain sugars or artificial sweeteners can be suitable for fasting as they provide necessary minerals without breaking the fast.

These electrolytes, including sodium, potassium, magnesium, and calcium, are crucial for many bodily functions, such as nerve signaling and muscle contraction. When choosing an electrolyte drink, it’s essential to read the label to ensure there are no hidden sugars or calories that could negate the fasting state.

While zero-calorie drinks that contain artificial sweeteners or other additives may not provide calories, their impact on insulin response and fasting can vary among individuals. Zero-calorie electrolyte drinks without sweeteners are generally considered safe for fasting and can help maintain electrolyte balance without disrupting the fast’s benefits.

Tips for Managing Hunger and Thirst During Fasting

Fasting can often bring about feelings of hunger and thirst. Managing these sensations effectively can help make your fasting experience more comfortable and sustainable. Here are some strategies to help you cope with hunger and thirst during your fasting periods:

Hydration Strategies

  • Drink Water Regularly: Sipping on water throughout the day can help prevent dehydration, which is often mistaken for hunger.
  • Use a Water Bottle: Keeping a water bottle with you at all times serves as a reminder to stay hydrated.
  • Start Your Day with Water: Drinking a glass or two of water upon waking can replenish any fluids lost overnight.
  • Flavor Your Water: Infusing water with lemon, cucumber, or herbs can make it more appealing without adding significant calories.
  • Track Your Intake: Use an app or a journal to track your water intake to ensure you’re getting enough fluids throughout the day.

Using Warm Beverages to Manage Hunger

  • Sip on Warm Tea or Coffee: Warm beverages can provide a sense of fullness and comfort, which may reduce hunger pangs.
  • Try Herbal Teas: Herbal teas come in many varieties and can be a great way to enjoy a warm drink without caffeine if you’re sensitive to its effects.
  • Bone Broth: For those who include bone broth in their fasting regimen, sipping on warm broth can provide satiety due to its savory flavor and nutrient content.

Timing Your Beverage Intake Effectively

  • Morning Beverages: If you experience morning hunger, a warm cup of herbal tea, black coffee, or water with a squeeze of lemon can help curb your appetite.
  • Afternoon Slumps: During an afternoon energy dip, a green tea or a few sips of sparkling water can help you revive without breaking your fast.
  • Evening Relaxation: Wind down in the evening with a warm, non-caffeinated beverage like chamomile tea to help you relax and stay hydrated without impacting your sleep and potentially causing weight gain.
  • Before “Meal” Times: Drinking a glass of water before your usual mealtime can help manage hunger signals as your body adjusts to the new eating schedule.

Remember, individual responses to fasting and hydration can vary. It’s essential to listen to your body and adjust your strategies accordingly. If you have certain health conditions, are taking medications, or are pregnant or breastfeeding, you should consult with a healthcare professional before starting any fasting regimen.

What To Drink While Intermittent Fasting – Conclusion

let’s recap the suitable beverages you can drink during intermittent fasting to maintain your fast and support your health goals. Remember, the key is to consume drinks that are low or calorie free to ensure you stay within the fasting state.

Water, both still and sparkling, remains the best choice to hydrate and support bodily functions without breaking your fast. It’s essential, especially on an empty stomach, to keep the body hydrated and functioning optimally.

Black coffee and tea are also excellent choices for those who prefer a caffeinated beverage. They contain minimal calories and can provide a sense of satiety without interfering with the fasting process. However, be cautious with artificial sweeteners; while they are calorie-free, they may trigger a metabolic response that could affect your fast. It’s best to consume these in moderation, if at all.

Bone broth is a nutritious option offering minerals and electrolytes, which may be particularly beneficial toward the end of a longer fasting window (4/5–12 hours). However, it’s important to note that bone broth contains a small number of calories, so it should be consumed in moderation depending on the strictness of your fasting regimen.

Avoid high-calorie drinks like fruit juice, which can spike insulin levels and negate the benefits of fasting. These beverages are not suitable when intermittent fasting, as they can disrupt the metabolic state you’re aiming for.

Incorporating healthy fats into your eating window can be beneficial, but remember that during your fasting period (0/1–2 hours), it’s best to avoid any caloric intake.

Time-restricted eating requires a disciplined schedule and understanding the best practices, including what to consume during fasting periods. Stick to the 0/2–9 or 0/1–2 hour guidelines for consuming zero-calorie drinks to ensure you maintain your fast.

Above all, listen to your body and adjust your fasting and consuming habits as needed. Every individual’s response to intermittent fasting can differ, so it’s crucial to pay attention to how your body feels during the process.

In closing, adhere to these guidelines for optimal fasting results, and you may find a sense of empowerment and well-being in your journey with intermittent fasting. Stay consistent, be mindful of your beverage choices, and let the discipline of fasting pave the way to your health and wellness goals.

Intermittent Fasting FAQ: What You Can Drink While Fasting Periods

Can I drink water during intermittent fasting?
Yes, water is the most essential beverage you can and should drink during intermittent fasting. It’s calorie-free and helps to keep your body hydrated, which is crucial while you fast. You can drink still or sparkling water, and adding a slice of lemon for flavor is generally acceptable.

Is it okay to drink coffee or tea while fasting?
Yes, black coffee and tea are permissible during an intermittent fast, as long as they are consumed without added sugars, milk, or cream. These drinks are calorie-free in their pure form and can help suppress appetite. However, be wary of artificial sweeteners, as they could potentially impact insulin levels and hunger cues for some individuals.

Can I consume bone broth during my fast?
Bone broth can be a gray area in intermittent fasting. While it contains calories, they are typically low, and bone broth provides nutrients that may help with electrolyte balance and gut health. Some fasting protocols allow for small amounts of bone broth during a fast, but for a strict fast, it’s best to avoid it due to its calorie content.

Are zero-calorie sweetened beverages allowed during fasting?
Beverages with artificial sweeteners are often considered acceptable because they are calorie-free. However, they may not be ideal. There’s evidence suggesting that artificial sweeteners could trigger cravings or affect your gut microbiome. For the purest form of fasting, it’s recommended to stick with water, black coffee, or tea without sweeteners.

What about drinking alcohol during intermittent fasting?
Alcohol is not recommended during the fasting period of intermittent fasting. Not only does alcohol contain calories, but it can also impede the liver’s ability to regulate blood sugar, potentially affecting the benefits of fasting. Therefore, if you choose to consume alcohol, it should be done during your eating window and in moderation.


  1. National Institute on Aging (NIA): The NIA conducts and supports research on the biological, clinical, behavioral, and social aspects of aging. Use their search feature to find information on intermittent fasting and its effects on autophagy and aging.
  2. National Institutes of Health (NIH): The NIH is one of the world’s foremost medical research centers. Search their database for peer-reviewed articles and studies on intermittent fasting and autophagy to find comprehensive and scientifically-backed information.
  3. Cell Metabolism Journal: This peer-reviewed journal publishes articles on the biological pathways that regulate cellular metabolism, including autophagy. Use their search function to find articles related to intermittent fasting and autophagy.
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About the author

David Lee is a leading obesity specialist based in Singapore. As a clinician-scientist with a National Hospital, David Lee advises patients with complex metabolic conditions and participates in clinical trials exploring new therapies. His research focuses on adipose tissue metabolism and how it impacts whole-body energy levels and disease risk. He continues to expand understanding of obesity and its link to diabetes through groundbreaking genetic and molecular studies published in top journals.