Can You Chew Gum While Fasting? Sugar-Free Gum Explained

In 30 seconds

Gum with sugar ends a strict fast, because sugar is energy. Sugar-free gum is a grey area: it uses low- or no-calorie sweeteners, but no fasting trial cited here tested it. On a strict zero-calorie fast, skip it; otherwise it’s a personal call.

• Gum with sugar adds energy, so it ends a strict zero-calorie fast.
• Sugar-free gum uses low- or no-calorie sweeteners; the fasting trials cited here never tested it.
• NHS guidance finds no evidence that sweeteners stimulate appetite in humans.
• Polyols such as sorbitol and xylitol can have a laxative effect in large amounts.

Does chewing gum break a fast?

It depends on the gum and on how strict your fast is. The trials behind this guide defined the fast as no caloric intake and listed the drinks that were allowed. Sugar is energy, so a sugared gum is out. Sugar-free gum is harder to call, because no trial cited here tested it.

In the 12-week TREAT trial, the time-restricted group was told to eat from noon to 8 p.m. and to completely abstain from caloric intake for the rest of the day.Source 11

In a 12-month randomized trial of eating only between noon and 8 p.m., participants were encouraged to drink plenty of water during the 16-hour fast and were allowed energy-free drinks such as black tea, coffee and diet sodas.Source 22

What’s in sugar-free gum?

Sugar-free gum swaps sugar for sweeteners. The ingredients list names them, for example aspartame, sucralose or acesulfame K, or polyols such as sorbitol, xylitol and erythritol. These are approved ingredients used instead of sugar.

NHS guidance describes lower- or no-calorie sweeteners as substances used instead of sugar in products including chewing gum, and considers all sweeteners approved in Great Britain a safe alternative to sugar.Source 33

Sugar-free gum has one clear advantage over the sugared kind: it is kinder to your teeth.

NHS guidance says high sugar intakes increase the risk of tooth decay, and that no-calorie sweeteners can help reduce that risk as long as the product contains no sugars.Source 33

Sweeteners are not a weight-loss tool, though. If you chew gum to stay on track, treat it as a habit that helps you, not as something that makes the fast work better.

WHO advises against using non-sugar sweeteners as a means of weight control.Source 44

Will gum make you hungrier?

Probably not because of the sweetener, although gum itself hasn’t been tested during a fast. If chewing makes you think about food, skip it; if it helps you through the last hour, that’s your call. For other ways to cope, see managing hunger while fasting.

NHS guidance says there is no evidence that sweeteners stimulate appetite in humans, while describing research on sweeteners and health overall as mixed.Source 33

Here, what breaks a fast is defined by trial rules: no caloric intake, with water and energy-free drinks allowed. The trials did not test gum, so claims that sugar-free gum raises insulin or stops fat burning are not supported by these sources.Source 11Source 22

Who should check the label first?

Frequently asked questions

Talk to a qualified health professional before fasting if you are pregnant or breastfeeding, under 18, living with or recovering from an eating disorder, have diabetes, take insulin or a medicine affected by meal timing, are an older adult, or are acutely ill. Do not change the dose or timing of any medicine without your clinician. See Blimbi’s safety guide.

Related guides

• What Breaks a Fast? Drinks, Gum and Medicines

  What breaks a fast? Trials allowed water, black coffee and tea, but no calories. Gum is untested; never change a medicine to keep fasting.

• Does Stevia Break a Fast? Sweeteners While Fasting

  Stevia and sucralose add little or no energy, yet no trial cited here tested them during a fast. See what the trials allowed and what WHO and NHS advise.

• Can You Drink Diet Soda While Fasting?

  Yes: diet soda has little or no energy, and a 12-month trial allowed up to two a day. See what sweeteners, caffeine and acidity add while fasting.

• Does Bone Broth Break a Fast? On a Strict Fast, Yes

  Bone broth breaks a strict zero-calorie fast because its protein and fat add energy. See how chicken broth compares and what a modified fast allows.

• How to Curb Hunger During Intermittent Fasting

  Hunger during intermittent fasting is expected, and trials do not show that fasting reduces it more than eating less. A gentler window may help.

Frequently asked questions

Does sugar-free gum break a fast?

Nobody knows for sure, because the fasting trials cited here didn't test it. It's sweetened with lower- or no-calorie sweeteners, so on a strict zero-calorie fast it's a grey area: skip it if you want to be certain.Source 11Source 33

Does gum with sugar break a fast?

Yes. Sugar provides energy, and fasting trials such as TREAT asked participants to avoid all caloric intake during the fast. Save sugared gum for your eating window.Source 11

Can chewing gum make you hungry while fasting?

NHS guidance finds no evidence that sweeteners stimulate appetite in humans. Gum itself hasn't been tested during a fast, so notice how it affects you and skip it if it makes you think about food.Source 33

Is xylitol gum OK while fasting?

Xylitol is a polyol, a type of sweetener used instead of sugar. Fasting trials haven't tested it, and NHS guidance notes that polyols can have a laxative effect in large amounts, so go easy on it.Source 33

Sources

1. 1

   Effects of Time-Restricted Eating on Weight Loss and Other Metabolic Parameters in Women and Men With Overweight and Obesity: The TREAT Randomized Clinical TrialDylan A. Lowe et al. American Medical Association (AMA), November 1, 2020.DOI: 10.1001/jamainternmed.2020.4153 · PMID: 32986097Human randomized trial

2. 2

   Time-Restricted Eating Without Calorie Counting for Weight Loss in a Racially Diverse Population: A Randomized Controlled TrialShuhao Lin et al. American College of Physicians, July 1, 2023.DOI: 10.7326/M23-0052 · PMID: 37364268Human randomized trial

3. 3

   The truth about sweetenersNHS. NHS, February 20, 2023.Official guidance

4. 4

   Use of non-sugar sweeteners: WHO guidelineWorld Health Organization. World Health Organization, May 15, 2023.Official guidance

5. 5

   Fasting Safely with DiabetesMartin M. Grajower. National Institute of Diabetes and Digestive and Kidney Diseases, August 26, 2020.Official guidance