Celsius energy drinks do not contain any high FODMAP ingredients. The drinks are sweetened with sucralose, a low FODMAP artificial sweetener, and skip the common gut triggers found in many other beverages like high fructose corn syrup, honey, agave, and sugar alcohols. That said, Celsius contains other ingredients that can still cause digestive issues for people following a low FODMAP diet to manage IBS or similar conditions.
What’s Actually in Celsius
The ingredient list for Celsius (both the Original and Vibe lines) is relatively simple: carbonated filtered water, taurine, citric acid, guarana seed extract, green tea extract, caffeine, ascorbic acid (vitamin C), sucralose, ginger root extract, natural flavors, and a handful of B vitamins. None of these fall into the five FODMAP categories: excess fructose, lactose, fructans, galactans, or polyols.
Compare that to what Monash University, the leading FODMAP research group, flags as common problem ingredients in drinks: fructose, high fructose corn syrup, honey, sorbitol, mannitol, xylitol, isomalt, and fructooligosaccharides (FOS). Celsius contains none of these. Many mainstream energy drinks and soft drinks rely on high fructose corn syrup or blends of sugar alcohols, which is where the FODMAP trouble usually starts.
Sucralose and FODMAPs
Sucralose is the sole sweetener in Celsius, and it’s considered low FODMAP. Your body absorbs very little of it, and it doesn’t ferment in the gut the way sugar alcohols do. This is a meaningful advantage over drinks sweetened with sorbitol or mannitol, which are well-known polyol triggers even in small amounts. If your only concern is strict FODMAP content, sucralose is not a problem ingredient.
Why Celsius May Still Bother Your Gut
Being technically low FODMAP doesn’t mean a drink is gentle on a sensitive digestive system. Celsius has two features worth thinking about if you have IBS or functional gut symptoms: its caffeine content and its carbonation.
Caffeine at 200 mg Per Can
A standard 12-ounce can of Celsius or Celsius Vibe delivers 200 mg of caffeine. The larger Celsius Essentials line contains 270 mg. For context, a typical cup of coffee has roughly 95 mg. Research published in the journal Nutrients found that people consuming 106.5 mg or more of caffeine per day had 47% higher odds of having IBS compared to those consuming less than 69.4 mg daily. That association was even stronger in people with a BMI of 25 or above, where high caffeine intake nearly doubled the odds.
Caffeine stimulates the colon and increases gut motility, which is the speed at which things move through your digestive tract. For someone already dealing with diarrhea-predominant IBS, 200 mg in a single sitting is a significant dose. Even if the FODMAP content is zero, caffeine alone can trigger cramping, urgency, and loose stools. If you’re in the elimination phase of a low FODMAP diet, adding a high-caffeine drink makes it harder to isolate which foods are actually causing your symptoms.
Carbonation and Bloating
Celsius is a carbonated drink, and carbonation introduces gas directly into your stomach. Research on carbonated beverages and gastrointestinal function shows that symptoms related to gastric distress tend to appear when you drink more than 300 ml (about 10 ounces) of a carbonated fluid. A standard Celsius can is 12 ounces, which puts you right past that threshold. If bloating and abdominal distension are part of your symptom picture, carbonation can make them worse regardless of FODMAP content.
How to Fit Celsius Into a Low FODMAP Diet
If you want to include Celsius while following a low FODMAP protocol, a few practical adjustments can help. Drinking half a can at a time keeps both caffeine and carbonation volume lower. This cuts your caffeine to 100 mg, still meaningful but closer to a single cup of coffee, and keeps the fluid volume under the 300 ml mark where carbonation-related bloating tends to kick in.
Timing matters too. Drinking Celsius on an empty stomach concentrates its effects on gut motility. Having it alongside food or after a meal can buffer some of that stimulation. Avoid stacking it with other caffeine sources like coffee or tea on the same day, especially during the elimination phase when you’re trying to keep variables to a minimum.
If you’ve been tolerating coffee without major issues, you’ll likely handle Celsius fine from a digestive standpoint. The FODMAP profile is clean. The real question is whether your gut can handle the caffeine load and carbonation, and that’s individual enough that the only reliable test is your own experience.