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Intermittent Fasting
Does Splenda Break a Fast? Important Facts
Intermittent Fasting

Does Splenda Break a Fast? Important Facts

Written by Thalia Oosthuizen | Fact checked by Fact checked by Rosmy Barrios, MD check
Last update: August 28, 2022
3 min
does Splenda break a fast
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When it comes to eating healthy, one of the first things we’re told is to cut out all the excess sugar from our diets. Instead, we’re offered c to help make our tea, coffee, and drinks taste sweet.

In particular, Splenda is a popular choice for artificial sweeteners. But can you have Splenda during your fasting period and not break your fast? 

Our experts in intermittent fasting take a look at Splenda, artificial sweeteners, and how they go together with intermittent fasting.

What Is Splenda?

Splenda is a brand of artificial sweetener found worldwide, and it is often used as a sugar substitute in lower-calorie foods instead of table sugar. Sugar substitutes are trendy in foods marketed towards people on a diet and can be found in diet sodas, zero-calorie treats, and sugar-free candy.

Splenda is made from sucralose, which is different from other sweeteners in that it’s made from sugar. However, sucralose has a different chemical structure than sugar, which means that your body isn’t recognizing it as a carbohydrate.

Sucralose is incredibly sweet, up to 600 times sweeter than regular sugar. With sucralose, Splenda has managed to make a sweetener that is just as sweet as sugar – and calorie-free.

But the real question is: can you have Splenda while on a fast?

Does Splenda Break a Fast?

While consuming sucralose alone won’t break your fast, the other ingredients in Splenda will cause both a GI and an insulin response by raising your blood glucose levels. This means that when you use Splenda to sweeten your tea or black coffee, you’re breaking your fast.

You need to step back and figure out your goal for intermittent fasting. For many people, the goal of intermittent fasting is gut health and weight loss.

In this case, some things are safe to consume during fasting: tea and coffee being among them. The goal here is to allow your gastrointestinal tract to rest while reducing your insulin response. 

Which Sweeteners Can You Consume While Fasting?

If you’re not a fan of unsweetened tea or black coffee, you may be wondering what sweeteners you can have while still sticking to your fasting regimen.

Here are some of the best sweeteners that you can have to soothe that sweet tooth.

#1 Stevia

Stevia is an excellent choice for those who are fasting. This sweetener is known for improving your insulin sensitivity, as well as reducing your blood glucose response. Stevia is also not absorbed by the GI tract, which means that whether you’re fasting for weight loss or gut health, you’re good to go.

#2 Monk fruit

Monk fruit is one of many natural sweeteners that is both calorie-free and carb-free. This sweetener is about 250 times sweeter than table sugar, making it one of the best sweeteners on the market. However, go easy if you’re fasting for weight loss – monk fruit may produce a mild insulin response if taken in large quantities.

#3 Allulose

Allulose is a reasonably new sweetener on the market. It’s known as a “rare sugar” in that it’s only found in small quantities out in nature. This sweetener doesn’t trigger an insulin response or stop ketosis. It’s great if you’re fasting for weight loss, but avoid it if you’re fasting for gut rest: about 70% of allulose is absorbed by the gut!

#4 Erythritol

Erythritol is a sugar alcohol with a similar chemical structure (but still different!). The caloric intake of erythritol is so minimal that it doesn’t break a fast for weight loss. However, you want to be careful if you’re trying to fast for gut rest because 90% of this sugar alcohol is absorbed in the gut.

#5 Xylitol

Another one of the sugar alcohol, xylitol, is one of the most common artificial sweeteners, well known for being in sugar-free gum and sugar-free candy. While it does not break a fast, you want to be careful with consuming too much, as large quantities could cause an insulin response.

What Is Dirty Fasting?

Dirty fasting is a term used among intermittent fasters to describe consuming some amount of calories during your fasting window. This is entirely different from “clean” fasting, which describes restricting all calories during the fasting period.

Dirty fasting allows anywhere from 100 to 500 calories to be consumed during the fasting period of the day. This type of fasting doesn’t result in the same benefits but promotes losing weight.

A Word From Our RD

Intermittent fasting is one of the best ways to promote fat loss, metabolic health, better insulin levels, reduced insulin resistance, gut rest, and more. Common sweeteners for a zero-calorie drink may seem like the right way to go, but you may be messing up your gut microbiome without even knowing it!

If you’re looking to help with weight gain issues, always make sure to talk with your doctor before going on a new diet or lifestyle change. Fasting has incredible benefits, but it isn’t for everyone. Restricted eating could flair up eating disorders or cause issues with your blood sugar.

For non-sugar sweeteners, always look for sugar alcohols and natural sweeteners! Artificially made sweeteners, like the ones found in diet soda, have a habit of causing more harm than good, even if they have zero calories.


So, does Splenda break a fast? Whether you’re fasting for weight loss or gut health, Splenda is going to cause a break in your fast. But, don’t worry. If Splenda was your go-to sweetener, we’ve provided a list of sweeteners that are safe for intermittent fasting.

When looking for your next sugar substitute, natural sweeteners and sugar alcohols are always best. Whether it’s for metabolic health, keeping control of your blood sugar, or even encouraging healthy gut bacteria, these sweeteners aren’t likely to cause insulin spikes nor disrupt your gut rest.

Written by
Thalia has always wanted to be a writer, starting her first local newspaper at the age of 11. She also has enjoyed a passion for health and fitness since a young age, playing many sports through her schooling career, and still enjoys biking, running, and swimming today. She studied English Language at University for 3 years, developing a passion for spelling, grammar, and research. She now has over 10 years of experience writing, proofreading, and editing, and has paired this with her love for health and fitness by writing health content.
Fact checked by Rosmy Barrios, MD
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