Does Artificial Sweetener Break A Fast? Here’s Your Answer

Artificial sweeteners are synthetic sugar substitutes that provide sweetness without the calories found in natural sugars.

These sweeteners are often used in various food and beverage products marketed as “diet” or “sugar-free” alternatives.

Artificial sweeteners, such as saccharin, aspartame, sucralose, and stevia, typically don’t contain significant calories or macronutrients, so they generally won’t break a fast if consumed in moderation.

However, some research suggests that artificial sweeteners may still affect insulin levels and metabolism, potentially interfering with the metabolic benefits of fasting.

In this article, I’ll answer the question “Does Splenda Break A Fast” and I’ll look at the effects of artificial sweeteners on our bodies.

Artificial Sweeteners Are Occasionally Pron to Break Fasting 

Several artificial sweeteners may be responsible for breaking your fast. Generally, artificial sweeteners do not contain calories, but sometimes, they cause an insulin reaction in some people.

It disrupts your fasting state and significantly hinders its benefits.

Insulin is a hormone that can signal the body to store fat, potentially interfering with fasting goals. However, the insulin response to artificial sweeteners is generally smaller than the response to natural sugar.

Still, I forbid you to worry as several sweeteners may break the fast, but not all alternatives will break your fast.

Sweeteners like steviol glycoside and saccharin do not usually break the fast. Therefore, I suggest you first know your fast’s purpose and choose which artificial sweetener will suit it.

Does Sucralose Break a Fast?

Yes, it can. Sucralose or Splenda are responsible for nutritionally breaking the fast. It raises blood sugar levels despite having zero calories.

Besides, Sucralose can trigger an insulin response in a few people. Moreover, this process prevents the burning of fat, which can break the fast.

Going a little deeper, Splenda is also associated with a variety of health effects related to insulin response. That’s why experts often recommend avoiding this sweetener.

I must admit that this sweetener sometimes triggers metabolic pathways that break the fast.

According to research, sucralose stimulates the pancreatic release of insulin. In addition, there is evidence that people who consume sucralose regularly have increased protein levels in their livers.

This increases insulin levels, in turn, and significantly breaks the fast at a steady state.

Does Sucralose Break a Fast?

Does Aspartame Break a Fast?

Generally, aspartame will not break the fast. However, it should not be consumed regularly while fasting to maintain insulin resistance.

The gut is stimulated when a person consumes aspartame regularly apart from fasting.

There are many beverages and zero-calorie soda drinks that contain aspartame. If you refrain from consuming them during the fast, then the fast will not be broken in any way.

But you must know a few factors that determine when the sweetener breaks the fast and when it doesn’t.

Aspartame may break the fast for those fasting for metabolic health or weight loss. Also, the sweetener will break even if you’re fasting for bowel rest. Even fasting for longevity can be broken by aspartame.

Few Artificial Sweeteners Are More Effective in Not Breaking the Fast

Although sweeteners like Splenda are occasionally responsible for breaking the fast, all sweeteners should not be mistrusted.

This is because some alternatives still do not break the fast, and you can safely consume them while fasting. However, I will mention them below:

1. Steviol Glycoside

Stevia, or Steviol glycoside, is a calorie-free artificial sweetener. It does not stimulate the gut as it is not absorbed in the GI tract.

Besides, various studies have shown that stevia also plays a significant role in regulating insulin and blood sugar levels.

It is always considered the best sweetener for those fasting for longevity. Apart from not breaking the fast, it also prevents fat burning.

2. Saccharin

Among all artificial sweeteners, Sweet ‘N Low or Saccharin is a popular name and it also comes with low calories. Furthermore, it has minimal effect on your blood sugar and insulin levels.

Therefore, you can be sure that Sweet ‘N Low won’t inhibit fat burning and break your fast. This sweetener is highly effective for weight loss fasting.

3. Monk Fruit

Monk fruit is Luo han guo fruit extract that is calorie-free, although it has been shown to break the fast in some cases.

Whether monk fruit will actually break the fast depends on what you are fasting for.

If you’re fasting for metabolic health or weight loss, it won’t hurt. Meanwhile, fasting for longevity will not be broken by eating monk fruit. So we can say monk fruit does not break a fast.

4. Allulos

Allulose is very low in calories and does not trigger an insulin response. Moreover, allulose lacks proteins that stimulate mTOR. That’s why Allulos does not break your fast.

It is considered suitable for longevity or weight loss fasting. But avoiding this artificial sugar substitute is better if you are fasting for gut rest.

5. Erythritol

Erythritol, a sugar alcohol, is often used as a low-calorie (20 calories /gram) sweetener in various products.

It occurs naturally in some fruits and fermented foods but is often commercially produced by fermenting glucose with certain yeast or fungi.

Erythritol is about 70% as sweet as table sugar (sucrose). It contains significantly fewer calories. It also has a negligible effect on blood sugar levels.

This makes it popular among people looking to reduce their sugar intake or manage their carbohydrate intake. This includes those with diabetes or following a low-carb diet.

It generally doesn’t have a significant effect on insulin or blood sugar levels, which are key factors in determining whether a fast is broken.

So I recommended erythritol is okay for fasting and erythritol does not break your fast.

Does Splenda Break A Fast?

Yes, Splenda, like other artificial sweeteners, does not contain calories or carbohydrates, so it technically shouldn’t break a fast in terms of caloric intake.

Splenda, also known as sucralose, is a zero-calorie artificial sweetener. If you are fasting for health or weight loss, it’s generally recommended to avoid anything that could stimulate insulin release.

This includes artificial sweeteners like Splenda. However, if you are fasting for weight loss, and Splenda helps you stick to your fasting plan without causing problems, it may be acceptable for you.

It’s generally recommended to avoid Splenda and other artificial sweeteners during a fast, regardless of the type.

List Of 13 Artificial Sweeteners that Do Not Break Your Fast

Here’s a chart. It lists 13 sweeteners that are generally considered okay to consume while fasting.

SweetenerTypeCalories per gramGlycemic IndexEffect on InsulinNotes
SteviaNatural00NegligibleDerived from the leaves of the Stevia plant
Monk FruitNatural00NegligibleExtracted from monk fruit
ErythritolSugar Alcohol0.240NegligibleGenerally well-tolerated
XylitolSugar Alcohol2.413MinimalCan cause digestive issues in large amounts
AlluloseSugar0.40MinimalLow-calorie sugar alternative
InulinFiber1.50MinimalPrebiotic fiber
TagatoseSugar2.43MinimalMetabolized slowly
SucraloseArtificial3.360MinimalNo effect on blood sugar
AspartameArtificial4.000MinimalBreaks down into phenylalanine
SaccharinArtificial00MinimalDiscovered in 1879, 300-400 times sweeter
NeotameArtificial00Minimal7,000 to 13,000 times sweeter than sucrose
Acesulfame PotassiumArtificial1.60MinimalStable under heat, used in baking
Glycyrrhizin (from Licorice)Natural00MinimalLicorice root extract, may have health benefits

Artificial Sweeteners Can Cause a Few Problems During Fasting

Despite the benefits of consuming artificial sweeteners while fasting, you shouldn’t ignore their problems.

I talked briefly about their side effects earlier, but now I want to go deeper. Hopefully, this section will be compelling enough for regular fasting and sugar substitute users.

  • Hunger and Cravings

Artificial sweeteners can increase food cravings. They can even lead you to crave natural sugar.

Especially when you are on a fast to lose weight, this extra hunger will disrupt your commitment. In most cases, this problem is personal.

  • Gut Microbiota

Our digestive system is home to trillions of microorganisms that often affect the gut microbiota composition after consuming artificial sweeteners. This, in turn, affects overall health, including metabolism.

  • Insulin Reaction

Some artificial sweeteners stimulate insulin secretion despite having low to no calories.

It means you are going to face more reactions besides breaking the fast. Unnecessary insulin release, especially during fasting, can counteract the intended benefits of your fast.

  • Personal Variations

Truly, artificial sweeteners do not cause adverse effects on all consumers. Several people consume them in moderation and maintain fasting efforts.

Conversely, one overeats, resulting in problems such as increased hunger or difficulty adhering to fasting routines.

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Artificial Sweeteners Intermittent Fasting

Does Artificial Sweetener Break A Fast

People commonly use intermittent fasting to shed extra pounds. During this fast, people consume artificial sweeteners as they take a long break from regular food.

But I advise fasting people to have in-depth consideration to taking sweeteners.

You have to take artificial sweeteners that do not disturb the fasting diet. Here, I would like to share some essential tips that will lead you regarding intermittent fasting and eating sweets.

  • Choose sweets that won’t affect blood sugar too much.
  • Eat artificial sweeteners in moderation, but don’t become entirely dependent on them.
  • Avoid excessive consumption of artificial sweeteners during fasting to give the body a break from constant digestion.
  • Monitor your own body’s response to sweets and adjust accordingly.

Wrap Up

So there you have it. I hope you find your answer that some Artificial sweeteners do not break your fast. They are often touted as a low-calorie or zero-calorie alternative to sugar.

You can find them in various beverages, snacks, and even medications.

Common examples include aspartame, sucralose, saccharin, and stevia. While these additives do not inherently contain significant calories, their impact on fasting remains a point of contention.

Dr. Clifton Morris
Dr. Clifton Morris

Meet Dr. Clifton Morris, MD. He's a highly accomplished medical professional with an impressive career. He graduated from University Of North Carolina in 1994

He's also a Senior Cardiometabolic Faculty at Baim Institute for Clinical Research.

He did his training in Internal Medicine at Brigham and Women’s Hospital and specialized in Gastroenterology and Cardiac Ultrasound at Tricities Hospital..