Does MCT Oil Really Break Your Fast?
Are you a devout faster, wondering if MCT oil will disrupt your hard-earned fasting benefits? MCT oil's impact on your fast is a complex topic. As with many aspects of nutrition and wellness, individual experiences vary, and experts have differing opinions.
In this blog post, we'll delve into the intricacies of using MCT oil during fasting and explore its potential effects on insulin response, energy metabolism, and much more.
Key Takeaways
- Using MCT oil during fasting does technically break a fast since it contains calories, but some approaches permit small amounts of healthy fats without disrupting insulin levels or metabolic state.
- The appropriate dosage and timing for taking MCT oil during fasting must be individualized and based on specific dietary goals, tolerance levels, calorie intake, and duration of abstinence from solid foods.
- Using MCT oil while fasting can offer several benefits, such as increased energy and focus and much more.
- Keep a close eye on your personal progress when adding MCT supplements to your regular fasting routine.
Does MCT Oil Break Your Fast?
The debate surrounding whether MCT oil breaks a fast is divisive, with arguments on both sides. On the one hand, consuming anything with calories like MCT oil should technically break a fast since it contains dietary energy.
MCT oil may not significantly affect insulin release and could even improve insulin sensitivity because it's easily absorbed by the body. (1)
This means that when consumed in small amounts during fasting periods, your body quickly utilizes these pure fat sources for fuel without disrupting your metabolic state or blood sugar regulation.
To illustrate this point further, some fasting mimicking approaches permit the consumption of healthy fats such as MCT oil without breaking their specific type of fast.
Can you use MCT oil while fasting?
Whether you can use MCT oil while fasting depends on the fast and your personal goals.
If you're following a strict fast with zero calorie intake, consuming MCT oil would technically break the fast as it contains calories.
For instance, in a modified fast or a fasting-mimicking diet (FMD), individuals may consume limited quantities of MCT oil without breaking their fast.
Moderate healthy fat intake doesn't affect insulin or ketosis, the fundamental principle of this approach. MCTs are ideal for these diets as they are easily absorbed and rapidly converted into energy instead of fat storage. (2)
Simply put, adding MCT to your diet can give a slight boost to calorie burning during fasting periods. It can help sharpen your mind and lift your energy levels, all without derailing your weight loss journey or improvements in blood sugar control that come with intermittent fasting.

How to Use MCT Oil while Fasting
Ready to discover the right dosage and timing for taking MCT oil during fasting? Curious about the benefits and potential downsides? Let's dive in!
Dosage & timing
Consider the following factors when using MCT oil in your fasting routine:
- Start with a small dosage: When beginning MCT oil supplementation, it's best to start with a small amount (e.g., 1 teaspoon) and gradually increase the dosage as your body adjusts.
- Monitor individual tolerance: As individual responses to MCT oil may vary, paying close attention to how your body reacts and adjusting accordingly is essential.
- Experiment with timing: The best time to consume MCT oil during fasting remains debatable; however, some individuals may prefer taking it in the morning for an energy boost, while others might find it more beneficial during the later stages of their fast.
- Consider fasting goals and duration: If you're engaging in short-term intermittent fasting, using MCT oil might have minimal impact on your overall results. However, longer fasts focused on autophagy might require careful consideration of MCT oil usage.
- Factor in calorie intake: Although consuming a small amount of MCT oil might not break your fast clinically, remember that it still contains calories that could affect weight loss goals or disrupt other aspects of fasting.
- Choose between liquid and powder forms: Some individuals may prefer using MCT oil powder due to its ease of use and mixability compared to liquid MCT oil.
- Combine with other supplements or ingredients if necessary: To enhance the benefits of taking MCT oil while fasting, consider mixing it with other supplements, such as collagen peptides or electrolytes, especially for those following a ketogenic diet.
MCT oil vs MCT oil powder
MCT oil is a popular supplement for fasting people, but what about MCT oil powder? While they both contain medium-chain triglycerides, there are some differences to consider.
MCT oil is typically liquid and can be easily added to drinks or food, while MCT oil powder is a more convenient option for on-the-go use.
However, MCT oil powder may contain additional ingredients, such as maltodextrin, that can add calories and affect insulin levels.
Mixing MCT Oil with other ingredients
Mixing MCT oil with other ingredients is a great way to enhance its benefits while fasting. Here are some ideas for mixing MCT oil with other healthy ingredients:
- Coffee: Adding MCT oil to your daily cup of coffee can help boost energy and focus while promoting fat burning during fasting.
- Smoothies: MCT oil can easily be added to your favorite smoothie recipe to increase healthy fat intake and keep you feeling full longer.
- Tea: Like coffee, adding MCT oil can provide a natural energy source and promote mental clarity while fasting.
- Salad Dressings: Mixing MCT oil with vinegar or lemon juice makes for a delicious salad dressing that is both healthy and beneficial during fasting.
- Nut Butter: You can enhance your fasting experience by combining MCT oil with nut butter like almond or peanut butter. This combination provides a beneficial source of healthy fats and helps to alleviate hunger.
Remember that when mixing MCT oil with other ingredients, don't overdo it. Stick to dosage recommendations. Start with small amounts and gradually increase as needed.

Benefits of Using MCT Oil While Fasting
Using MCT oil while fasting can offer a range of benefits, including increased energy and focus, appetite suppression, improved digestion, and enhanced ketosis.
Increased energy & focus
Many of us who follow intermittent fasting rely on MCT oil as a popular supplement because it can help boost energy levels and focus. MCTs are rapidly absorbed by the body, providing fast-acting fuel to your cells.
Research suggests that MCT oil increases cognitive function and mental performance due to its ability to enhance ketone production in the brain. This means you may experience improved concentration and focus during your fasting period. (3)
By adding MCT oil to your fasting diet, you can experience sustained energy throughout the day, helping you stay focused and productive without feeling tired or sluggish.
Appetite suppression
MCT oil is known for its potential to suppress appetite, which can be beneficial during fasting periods.
MCTs are quickly metabolized into ketones by the liver and used as an energy source instead of glucose.
Ketones have been linked to decreased hunger hormones, such as ghrelin, while increasing satiety hormones, like cholecystokinin (CCK). (4)
Additionally, MCT oil may help weight loss by reducing overall calorie consumption.
In fact, one study found that those who consumed MCT oil with their breakfast ate significantly fewer calories throughout the day than those who did not consume MCTs.
Improved digestion
Due to its unique chemical structure, MCT oil is easily absorbed by the body and can fuel the gut bacteria that aid digestion.
In fact, research suggests that MCT oil may even increase beneficial gut bacteria while decreasing harmful ones.
MCT oil can help alleviate digestive issues such as bloating, gas, and diarrhea by improving the absorption of nutrients. (5)
Enhanced ketosis
Ketosis is the metabolic state in which the body shifts from burning glucose for energy to burning fat.
This happens during periods of low carbohydrate intake, such as during a fast. MCTs are easily absorbed and quickly converted by the liver into ketones, which can provide an alternative energy source for the body during fasting.
By consuming MCT oil, you can increase your circulating ketone levels, potentially leading to increased fat-burning and weight-loss benefits.
Conclusion
Whether or not MCT oil breaks your fast remains a hotly debated topic. While technically consuming anything with calories may break your fast, small dosages of MCT oil may not impact fasting insulin levels.
The ideal timing for consuming MCT oil during fasting is still being determined. Nevertheless, it can provide numerous benefits, such as increased energy and focus, appetite suppression, improved digestion, and enhanced ketosis.
Just remember that results may vary based on individual factors, and opinions among experts differ.
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FAQs
Does consuming MCT oil during my fast break the fast altogether?
While technically any caloric intake, including MCT oil, breaks a fast, it's crucial to note that MCT oil's impact on blood sugar and insulin levels is relatively small and short-lived. Therefore, incorporating a moderate amount of MCT oil can still align with the benefits of fasting for many individuals. In fact, some research suggests that MCT oil may even help extend the length of a fast.
How much MCT oil should I consume while fasting?
The optimal dosage of MCT oil during fasting varies from person to person, depending on factors such as body weight, metabolic rate, and personal tolerance levels. However, a general guideline is one tablespoon per day, which should not significantly interfere with the potential health benefits associated with fasting.
Do MCT oils pose any risks or side effects during a fast?
Some people may experience mild gastrointestinal discomforts such as bloating, nausea, or diarrhea when taking high doses of MCT oils, especially without adequate food intake. As everyone reacts differently to dietary supplements, it's always wise to consult your doctor before making changes to your diet or nutrition programs, especially if you have pre-existing medical conditions.
Can I take my regular medications and use MCT oils during my fasting period?
Yes, you can take your regular medications and use MCT oils during your fasting period. However, as with any dietary supplement, it's best to consult with your healthcare provider before integrating MCT oil into your daily routine, especially if you're on prescription medication or have health issues.
Does MCT oil affect insulin levels during fasting?
Research suggests that MCT oil doesn't significantly affect fasting insulin levels and may even improve insulin sensitivity, making insulin work better in the body. This makes MCT oil a popular choice for those practicing intermittent fasting.
Can MCT oil provide energy during fasting?
Yes, MCT oil can provide a good boost of energy during your fasting window. This is because MCTs are quickly absorbed and converted into energy, making them a useful fuel source during a fast.
Related Studies
- A study published in 2022 found that MCTs ingested before meals were reported to induce a series of physiological changes, including lowered postprandial blood glucose levels, increased insulin secretion, suppression of food intake, and increased GLP-1 levels in the blood.
- A 2022 study found that the dietary use of MCT oil is more acceptable and is more ketogenic than other types of fats. The study also found that there is a relationship between insulin resistance and the main pathways of ketosis.
- A study published in 2019 found that MCTs produce ketones that can be used as an alternative energy source by the brain, and that MCT oil can increase cognitive function and mental performance by enhancing ketone production in the brain
- A 2023 article on Healthline cites some studies that suggest MCT oil could promote the release of two hormones that help people feel full when eating: peptide YY and leptin. However, the article also notes that large amounts of MCT oil could increase the amount of fat in the liver or raise hunger hormones for some people.
- 2020 article on Healthline states that MCTs have been linked to lower cholesterol levels in both animal and human studies. Additionally, one animal study found that administering MCT oil to mice fed a high-fat diet helped protect against insulin resistance and inflammation.