Does Apple Cider Vinegar Break a Fast?

Does apple cider vinegar break a fast? No, with zero grams of carbs per tablespoon, apple cider vinegar (ACV) is unlikely to impact your metabolic fasting state.

Let’s explore the potential benefits of incorporating ACV into your fasting routine.

What is apple cider vinegar (ACV)?

ACV is made by crushing apples and adding yeast to ferment their natural sugars into alcohol. 

Then, beneficial bacteria are introduced to convert the alcohol into acetic acid, the main compound responsible for vinegar’s sharp flavor and potential health benefits.

“Unfiltered ACV contains the mother, a complex mixture of bacteria, enzymes, and proteins that forms naturally during fermentation,” explains Dr. Berg. “These components are believed to contribute to ACV’s health benefits, including promoting gut health and aiding the body’s natural cleansing processes.”

Some people also combine ACV with herbal teas to create nourishing drinks that may support digestion and enhance hydration.

In the kitchen, ACV is valued for its bright, tangy flavor and is commonly used in salad dressings, marinades, sauces, and even baking.

According to data published by the U.S. Department of Agriculture (USDA), one tablespoon of ACV contains:¹

• 1.9 calories
• 0 g fat
• 0 g protein
• 0 g carbohydrates

In addition, apple cider vinegar contains around 6 percent acetic acid, placing it among the vinegars with the highest concentrations, alongside white distilled vinegar and some types of balsamic vinegar.

Watch the video below to find out if ACV is fasting-friendly.

Does apple cider vinegar break a fast?

No, ACV won’t break a fast when consumed in small amounts. Just 1 to 2 tablespoons contain virtually no calories or carbohydrates, making it unlikely to interfere with ketosis or the benefits of fasting.

In fact, the high acetic acid content in ACV may enhance the benefits of fasting by supporting metabolic balance and appetite control.

Due to these effects, many individuals practicing intermittent fasting (IF), alternate day fasting, or water fasting include diluted ACV during their fasting window.

In addition, taking ACV just before your first meal after fasting may help enhance digestion, improve nutrient absorption, and support lower blood sugar levels. 

Benefits of apple cider vinegar for weight loss

ACV offers several weight management benefits, making it a popular choice for those following fasting protocols and the Healthy Keto® diet.

Here are three key benefits of apple cider vinegar for weight management. 

1. Supports appetite and cravings control

A study published in Current Developments in Nutrition suggests that vinegar containing acetic acid could aid in temporarily suppressing appetite when consumed with a meal.²

In particular, those who took ACV appeared to experience reduced hunger sensations for up to two hours after eating and reported a lower food intake over the next several hours. 

Additionally, the sour taste of ACV may help reduce sugar cravings by stimulating taste receptors, which can influence hormone release and support better blood sugar regulation.

2. Promotes metabolic health 

Blood sugar imbalances and high cholesterol levels can lead to lower energy levels, mood swings, difficulty concentrating, and unwanted weight gain. 

Research published in BMC Complementary Medicine and Therapies suggests that ACV may mitigate these concerns by supporting cholesterol balance and promoting healthy fasting blood sugar and HbA1C levels, which are essential markers for long-term blood sugar control and metabolic health.³

It may also improve insulin sensitivity, thereby reducing the risk of insulin resistance and enhancing the body’s ability to regulate blood sugar more effectively.

The study further reveals that these benefits have been particularly observed in individuals with type 2 diabetes who consumed two tablespoons or less of ACV daily for more than eight weeks.

3. May help extend fasting periods

ACV may support the body’s ability to sustain longer fasting periods by influencing digestion and nutrient signaling.

The acetic acid in ACV can slow the rate at which food leaves the stomach, helping maintain feelings of fullness for a longer time.

This delayed gastric emptying can reduce spikes in blood sugar levels, which in turn may balance hunger hormones, making fasting feel more manageable.

What’s more, by helping regulate blood sugar levels, ACV supports more stable energy, potentially reducing the fatigue that can make it harder to maintain a fast.  

How and when to have apple cider vinegar 

To use apple cider vinegar safely and effectively, dilute 1 to 2 tablespoons in 8 to 12 ounces of water and consume it 15 to 30 minutes before meals to support digestion and metabolic health.

Individuals who are sensitive or prone to discomfort should refrain from drinking ACV on an empty stomach, as it can cause stomach upset and irritation.

Adding a squeeze of fresh lemon juice or a pinch of electrolytes to an ACV drink not only improves the flavor but also helps support hydration.

It’s best to drink ACV through a straw and always dilute it, as drinking it straight can lead to tooth enamel erosion and throat irritation. After taking ACV, rinse your mouth with plain water to protect your teeth. 

If you’re new to ACV, start with smaller amounts, such as one teaspoon, and gradually increase it as your tolerance adjusts.  

Consulting a healthcare professional to discuss the use of ACV is also recommended for individuals with any underlying health concerns.

FAQ

Sources

1. “Apple cider vinegar.” USDA FoodData Central. https://fdc.nal.usda.gov/food-search/?query=1908692 ↩︎
2. “Apple Cider Vinegar as a Functional Food.” Current Developments in Nutrition. 2022;6(Suppl 1):526. doi:10.1093/cdn/nzac053.026 https://pmc.ncbi.nlm.nih.gov/articles/PMC9193460/ ↩︎
3. Hadi A, Pourmasoumi M, Najafgholizadeh A, Clark CCT, Esmaillzadeh A. The effect of apple cider vinegar on lipid profiles and glycemic parameters: a systematic review and meta-analysis of randomized clinical trials. BMC Complement Med Ther. 2021;21(1):179. doi:10.1186/s12906-021-03351-w https://pmc.ncbi.nlm.nih.gov/articles/PMC8243436/ ↩︎