does splenda break intermittent fasting
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Does Splenda Break Intermittent Fasting? 5 Facts You Need to Know

Introduction: Does Splenda Break Intermittent Fasting

Intermittent fasting has been gaining popularity in recent years as a way to improve health and lose weight. It involves cycling between periods of eating and fasting, with various methods and schedules to choose from. Studies have shown that intermittent fasting provides numerous benefits, including improving insulin sensitivity, reducing inflammation, and promoting weight loss.

One common question among those who practice intermittent fasting is whether they can have Splenda, a popular sugar substitute, while fasting. Sucralose is the source of Splenda, a zero-calorie sweetener frequently used in beverages and foods. While it does not contain calories or carbohydrates, people often question if it can still interrupt a fast and impact their health goals. While it does not contain calories or carbohydrates, some wonder if it can still break a fast and affect their health goals.

In this article, we will dive into whether Splenda breaks intermittent fasting and answer common questions such as whether it affects ketosis, fasting blood sugar, and insulin levels. By the end of this article, readers will better understand whether Splenda is a suitable sweetener to use during intermittent fasting and its potential impact on their health goals.

What is Intermittent Fasting?

It’s a way of eating that’s gained much attention lately, and for a good reason. Essentially, intermittent fasting involves limiting your food intake to certain hours or days of the week. Some people fast for 16 hours a day and eat within an 8-hour window, while others fast for 24 hours once or twice a week.

There are a lot of benefits associated with intermittent fasting, too! For starters, it’s been shown to improve insulin sensitivity, which is excellent news for anyone with diabetes or who wants to maintain healthy blood sugar levels. Intermittent fasting has also been linked to lower inflammation and weight loss. That’s right, by eating within a specific timeframe, you could shed a few pounds without even trying!

What is Splenda?

Splenda label nutrition
Image credit: Splenda.

Splenda is a popular sugar substitute that has recently gained immense popularity. It is made from sucralose, a zero-calorie sweetener derived from sugar. Splenda is used in many beverages and foods as an alternative to sugar. Many people trying to reduce their sugar intake or lose weight opt for Splenda instead of regular sugar.

However, there are concerns about the safety of Splenda. Some people wonder if it is safe to consume and if it can adversely affect their health. This section will define what Splenda is and how it is made. We will also discuss its popularity as a sugar substitute and its use in foods and drinks. Lastly, we will address common concerns about Splenda and its safety.

Does Splenda Break Intermittent Fasting?

You may wonder if consuming Splenda can break your fast if you practice intermittent fasting. The short answer is that it depends on your goals and the type of fast you’re doing. Splenda is a zero-calorie sweetener from sucralose commonly used in beverages and foods as a sugar substitute. While it doesn’t contain calories or carbohydrates, it tastes sweet, potentially affecting your body’s response to fasting.

Insulin plays a crucial role in intermittent fasting. When we eat, our body produces insulin to help regulate blood sugar levels. During a fast, our insulin levels drop, allowing our body to access stored fat for energy. However, consuming Splenda can trigger the release of insulin, which could interfere with the benefits of fasting. Additionally, Splenda has been shown to affect gut bacteria, which could also impact insulin sensitivity and metabolism.

Another potential concern with Splenda and fasting is its impact on ketosis. Ketosis is a metabolic state where the body switches from using glucose for energy to using ketones produced from stored fat. Consuming Splenda could impact ketosis by triggering insulin release or affecting blood sugar levels. If your goal with fasting is to achieve ketosis, avoid Splenda or any other sweeteners during your fasting window.

If you want more ideas on what to drink during your fast, check out my blog post on ‘What Can You Drink During Intermittent Fasting: 10 Delicious Drinks!’ for some tasty and satisfying options.

The Science of Splenda and Intermittent Fasting

Several recent studies have examined the impact of Splenda on fasting and metabolism. One study published in the American Journal of Clinical Nutrition found that artificial sweeteners, including Splenda, were associated with an increased risk of obesity, metabolic syndrome, and type 2 diabetes(1). Another study published in Nature found that artificial sweeteners like Splenda can alter gut microbiota and impair mouse glucose tolerance(2).

These findings suggest that Splenda may hurt fasting and overall health. While more research is needed to understand Splenda’s effects on the body entirely, these studies highlight the potential risks of consuming artificial sweeteners while fasting.

Individuals who practice intermittent fasting may want to consider limiting or avoiding using Splenda and other artificial sweeteners. Instead, natural sweeteners like stevia or monk fruit can be used as a substitute for sugar without the adverse side effects of Splenda(3).

5 Facts You Need to Know

Image credit: Splenda

Suppose you’re considering incorporating Splenda into your intermittent fasting routine. In that case, knowing some key facts about this zero-calorie sweetener is essential.

Fact 1: Splenda contains no calories, so it’s a popular sugar substitute. Reducing calorie intake is often an essential strategy for losing weight. Splenda can be a helpful tool in that regard.

Another critical fact to note is that Splenda does not impact insulin levels. Insulin is a hormone that regulates blood sugar levels. When classes are high, the body can enter a state of fat storage rather than fat burning. This is why keeping insulin levels in check during intermittent fasting is essential. Fortunately, Splenda has been shown to have no impact on insulin levels, meaning it should not interfere with fasting.

In addition, Splenda does not trigger hunger hormones. Ghrelin is a hormone responsible for stimulating hunger. Staying in a fasting routine can be challenging when levels are high. However, studies have shown that Splenda does not produce the release of ghrelin, which means it shouldn’t cause any hunger pangs that could derail your fasting efforts.
When it comes to the question of whether Splenda breaks a fast, the answer is more complex.

Fact 4: In most cases, Splenda has not been shown to break a fast. However, some experts believe that it could still have an impact on fasting under certain circumstances. For example, some argue that the taste of Splenda could trigger the release of insulin, which would interfere with the fasting process.

Finally, Fact 5: it is worth noting that some experts believe that Splenda may break a fast in certain circumstances. For example, consuming Splenda with a meal could trigger an insulin response interfering with fasting. Additionally, even the taste of Splenda could be enough to break a fast, as it may stimulate insulin release. However, more research is needed to understand the impact of Splenda on fasting fully, and it’s ultimately up to each individual to decide whether or not to include it in their routine.

Splenda vs. Other Sweeteners

When it comes to sweeteners, there are several options, each with its pros and cons. Some popular sweeteners include stevia, Saccharin, and dextrose, but Splenda remains a common choice for many. Splenda is made from sucralose, a calorie-free sweetener commonly used in beverages and foods. On the other hand, stevia is a natural sweetener that comes from the leaves of the stevia plant. Saccharin, also known as Sweet’N Low, is a calorie-free sweetener that has been in use since the late 1800s. Dextrose, or glucose, is a sugar often used as a sweetener in processed foods.

When it comes to the impact of these sweeteners on insulin levels, blood sugar, and ketosis during intermittent fasting, there are some differences to consider. Splenda has been shown to have no impact on insulin levels and blood sugar, which makes it a popular choice for those who want to avoid spikes in their blood sugar during a fast.

Stevia has also been shown to have no impact on insulin levels or blood sugar, making it a good choice for those who want a natural sweetener option. On the other hand, Saccharin has been shown to have a minimal impact on blood sugar levels but can lead to an insulin response. Dextrose, a sugar, can lead to spikes in blood sugar and insulin levels.

When it comes to the question of whether stevia or Splenda is better for intermittent fasting, the answer may depend on personal preference. Both sweeteners have been shown to have no impact on insulin levels or blood sugar, making them good options for those who want to avoid breaking their fast. However, some people may prefer the taste of stevia over Splenda or vice versa. Choosing a sweetener that works best for your needs and goals is essential.

How Much Splenda Can You Have During Intermittent Fasting?

When it comes to intermittent fasting, many people wonder how much Splenda they can have while still maintaining the benefits of their fasting. The good news is that Splenda has been deemed safe for consumption by the FDA(4). It should not significantly impact intermittent fasting results as long as it is consumed in moderation.

The FDA has set a daily intake level for Splenda at 5 milligrams per kilogram of body weight(4). For a 150-pound person, this would translate to around 340 milligrams of Splenda per day. However, it’s important to note that this recommendation is for overall daily intake and not specifically for intermittent fasting. Therefore, it’s up to each individual to determine how much Splenda they want to consume during their fast, keeping their health and dietary goals in mind.

Ultimately, the amount of Splenda, a person can consume during intermittent fasting depends on their tolerance and goals. Some people may avoid artificial sweeteners altogether during a fast, while others may feel comfortable consuming a small amount. It’s essential to listen to your body and adjust your consumption accordingly to achieve the desired results from your fast.

Side Effects of Splenda

Splenda is generally considered safe for consumption but can have side effects like any food or substance. Some of Splenda’s most commonly reported side effects include digestive issues such as bloating, gas, diarrhea, and headaches(5). These side effects are typically mild and temporary; only some who consume Splenda will experience them. However, they can disrupt the fasting process, mainly if they occur frequently or are severe.

For intermittent fasters, it’s essential to be mindful of any side effects of Splenda consumption, as they can impact the effectiveness of the fast. Digestive issues can cause discomfort and distract from the focus on fasting. At the same time, headaches can make it difficult to concentrate or feel well during the fast. It’s also worth noting that some people may be more sensitive to Splenda than others and may experience side effects more frequently or severely.

If you are experiencing side effects from Splenda consumption during intermittent fasting, consider alternatives or reducing your intake. As always, it’s essential to consult with a healthcare professional before making any significant changes to your diet or fasting routine. They can help you determine whether Splenda is safe and appropriate for your health needs and goals.

Answers to Common Questions About Splenda and Intermittent Fasting

As with any topic, people always have questions about using Splenda during intermittent fasting. One of the most common questions is whether or not it is okay to consume Splenda in tea or coffee while fasting. The short answer is that it depends on who you ask. Some experts say drinking small amounts of Splenda during a fast is okay, while others recommend avoiding it altogether. Ultimately, the decision is up to the individual and what they feel comfortable with.

Another common question is whether or not Splenda can be used to sweeten foods during a fast. Again, the answer varies depending on who you ask. Some experts say it is okay to use Splenda sparingly to enhance foods during a fast, while others recommend avoiding it altogether.

It is essential to remember that intermittent fasting aims to give your body a break from processing food, so using any sweetener, even calorie-free ones, can potentially impact the benefits of fasting. As with consuming Splenda in tea or coffee, the decision to use it to sweeten foods during a fast is up to the individual and their personal goals and preferences.


In conclusion, this article provides an overview of Splenda and its potential impact on intermittent fasting. We discussed the role of insulin, ketosis, and blood sugar levels during a fast and how Splenda may affect them. We also compared Splenda to other popular sweeteners and addressed common questions and concerns regarding its use during a fast.

Based on the information presented, Splenda can be consumed during intermittent fasting without breaking the fast. However, it is essential to be mindful of the potential adverse side effects, such as digestive issues and headaches, and to consume Splenda in moderation.

Experimenting with other natural sweeteners, such as stevia, may also be beneficial to determine which works best for individual needs.
In conclusion, more research is needed to fully understand the effects of Splenda on intermittent fasting and long-term health outcomes.

However, for those who consume Splenda during a fast, it is recommended to do so in moderation and be mindful of any potential adverse side effects. Ultimately, deciding to use Splenda or other sweeteners during intermittent fasting is personal and should be made based on individual goals, preferences, and health considerations.


(1) The Impact of Artificial Sweeteners on Body Weight Control and Glucose Homeostasis

(2) Effects of Sweeteners on the Gut Microbiota: A Review of Experimental Studies and Clinical Trials

(3) 10 Alternatives to Refined Sugar – Healthline

(4) Additional Information about High-Intensity Sweeteners Permitted for Use in Food in the United States

(5) Splenda: Is it safe? – Medical News Today

Joseph Emb
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Hi there! I'm Joseph Emb, a nutritionist and certified personal trainer passionate about helping people reach their health and fitness goals. With over ten years of experience in the health and wellness industry, I've accumulated a great deal of knowledge that I love to share with my readers. I have a degree in exercise science and am proud to have been featured in reputable publications such as Men's Health and Women's Fitness. My goal with my blog is to inspire and empower others to take control of their health and live happier healthier lives.