Guide · Oct 26, 2026

Does Chewing Gum Break a Fast? Calories, Insulin and Hunger

Sugar-free gum has about 5 calories a piece and sugared gum about 10, per USDA label data. Here is when gum breaks a fast, what the insulin and hunger studies show, and when to skip it.

By Michael Gonzales · Last updated Oct 26, 2026

Does Chewing Gum Break a Fast? Calories, Insulin and Hunger

Short answer: Technically, yes, but barely. A piece of sugar-free gum has about 5 calories, and a stick of regular sugared gum has about 10 calories and 2 grams of sugar, based on labels in USDA FoodData Central [1][2][3][4][5]. On a strict zero-calorie fast, any gum counts. On a flexible 16:8 or OMAD plan, a piece of sugar-free gum is a very small Ping. The one time to skip gum entirely is before a fasting blood test [8].

In PingDiet terms, gum sits between plain water and a real snack. It's much closer to water, but it isn't zero.

Who should skip fasting: Johns Hopkins Medicine says intermittent fasting isn't for children and teens under 18, people who are pregnant or breastfeeding, people with type 1 diabetes who take insulin, or anyone with a history of eating disorders, and that everyone should check with a doctor before starting [12]. This page is general information, not medical advice.

How many calories are in a piece of gum?

Less than most people guess, but not zero. We pulled label data for seven gums from USDA's Branded Foods database and worked out the numbers for one labeled serving.

Gum and labeled serving	Calories	Carbs	Sugar
Doublemint (sugared), 1 stick, 2.7 g	~10	2 g	2 g
Big Red (sugared), 1 stick, 2.7 g	~10	2 g	2 g
Extra Peppermint, sugar-free, 1 stick, 2.7 g	~5	2 g	0 g
Orbit Spearmint, sugar-free, 1 piece, 1.9 g	~5	1 g	0 g
Orbit White Spearmint, sugar-free, 1 piece, 2 g	~5	2 g	0 g
Ice Breakers, sugar-free, 1 piece, 2.3 g	~5	2 g	0 g
Trident Spearmint, sugar-free, 2 pieces, 2.8 g	~5	2 g	0 g

Source: USDA FoodData Central, Branded Foods label data published 2019 to 2023 [1][2][3][4][5][6][7]. We multiplied each label's per-100-gram values by its serving size and rounded. Recipes change, so check the pack in your hand.

Two things stand out. Sugar-free gum still has carbs, because sugar alcohols like sorbitol, xylitol and maltitol count as carbohydrates on the label. And the sugared sticks get all their carbs from sugar.

Why do some packs say 0 or 5 calories? FDA label rules round calories to the nearest 5 up to 50, and amounts under 5 can be listed as zero [9]. So "5 calories" on a pack can mean anything from about 2.5 to 7.

Does sugar-free gum break a fast?

It depends on the fast you're doing.

Your fast	Sugar-free gum	Sugared gum
Strict zero-calorie fast	Breaks it, technically	Breaks it
16:8, 18:6 or OMAD for routine	A piece or two is a small Ping	Adds sugar; skip it
5:2 or modified fasting days	Counts toward your calorie budget	Counts toward your budget
Fasting before a blood test	Don't chew any gum	Don't chew any gum

A clean intermittent fast. Johns Hopkins lists water and zero-calorie drinks such as black coffee and tea for the fasting hours [12]. Gum isn't on that list. If you want something to break up the hours, black coffee or plain tea keeps the fast clean. Our coffee guide covers what you can add.

A flexible fast. If your goal is the routine more than a strict zero, about 5 calories from a piece of sugar-free gum is a very small amount. Count each piece you chew, though. A pack chewed through the afternoon adds up.

Sugared gum is the one to skip during the fasting hours. Each stick is about 2 grams of sugar, so several sticks are a small sugary snack.

Can gum affect insulin?

Possibly, but the evidence is thin. In a 2020 study, 22 people chewed sugar-free gum for 20 minutes after a 12-hour fast. Over the next one to four hours, researchers measured statistically significant changes in insulin, C-peptide, cortisol, triglycerides and a long list of other blood tests, compared with each person's starting values [10]. The authors recommend that patients avoid gum before lab tests.

That's a small study with no group that skipped the gum, so some of the changes may just reflect the time of day. It measured blood test results, not fasting goals like weight. It doesn't show that a piece of gum undoes a fast. It does show why lab instructions treat gum as off-limits.

Can you chew gum before a fasting blood test?

No. MedlinePlus, from the National Library of Medicine, says that while you're fasting for a blood test, you shouldn't chew gum, smoke or exercise. Plain water is the only thing it lists as allowed [8]. Follow the written instructions your provider gives you, and ask them if anything is unclear.

Does chewing gum help with hunger while fasting?

It may, a little. A 2025 systematic review looked at nine randomized trials. Five of the seven trials that measured appetite found gum reduced hunger, and three of five found a lower desire to eat [11]. But the reviewers found the effects on fullness, how much people ate later and weight loss weren't conclusive.

So gum might make the last hour of a fasting window easier for some people. It isn't a proven way to eat less.

A separate small trial in 20 healthy volunteers found that chewing a sugared gum for 45 minutes didn't change how fast water emptied from the stomach [13]. That study was about anesthesia safety, not fasting, but it's one of the few direct measurements of gum and digestion.

What to watch for in sugar-free gum

Sugar-free gum is the better pick for a fasting window, but read the label for these:

Sugar alcohols can upset your stomach. FDA rules require foods that could lead to eating 50 grams of sorbitol a day to carry the line "Excess consumption may have a laxative effect" [14]. A few pieces won't get you near that, but chewing pack after pack can cause problems for some people.
Xylitol is dangerous for dogs. The FDA warns that sugarless gum may contain xylitol, and that many of the dog poisoning reports it received involved chewing gum [15]. In our table, Ice Breakers and Orbit White list xylitol first [6][7]. Keep packs out of reach of pets.
Check the full ingredients if you're unsure. Paste the panel into our label checker to see what's in it.

If you want a pack for the hours you fast, compare sugar-free gum on Amazon. Check the serving size and sugar alcohols on the listing before you buy.

More on what breaks a fast

If you're still choosing a schedule, our 16:8 vs 18:6 vs OMAD comparison lays out the trade-offs. For supplements during a fast, see do supplements break a fast and our electrolytes guide. The full What Breaks a Fast section covers more drinks and add-ins.

Photo: Pavel Danilyuk, Pexels

Sources

Frequently asked questions

Does sugar-free gum break intermittent fasting?

Technically, yes, because it has about 5 calories a piece. On a flexible 16:8 or OMAD plan, a piece is a very small Ping. On a strict zero-calorie fast, skip it.

Does gum break a fast for autophagy?

No study we found measured autophagy after chewing gum, so nobody can say for sure. If that is your goal, the safest choice is to treat any gum as breaking the fast.

Can I chew gum before a blood test?

No. MedlinePlus says not to chew gum, smoke or exercise while fasting for a blood test. Plain water is allowed. Follow your provider's written instructions.

How many calories are in sugar-free gum?

About 5 calories per piece or labeled serving for the sugar-free gums we checked in USDA label data. Packs may list 0 or 5 because FDA rules round calories to the nearest 5.

Does chewing gum reduce hunger?

It might. In a 2025 review, five of seven trials found gum reduced hunger, but the effects on how much people ate later and on weight were not conclusive.

Written by

Michael Gonzales

Founder & Editor

Michael Gonzales is the founder of Cloudalien Technologies LLC, the company that owns PingDiet, and he edits every page on the site. PingDiet publishes practical guides to intermittent fasting and to eating fewer times a day. Michael is not a doctor or registered dietitian, so nothing on PingDiet is medical advice.