tonic water
Beverages
Is tonic water high in gos?
Is tonic water high or low in gos? See its exact rating, how much counts as a portion, and its FODMAP, salicylate, oxalate and diet compatibility in one place.
Related checkers
Compare tonic water across criteria
Sensitivity notes
Why gos food checker matters
Galacto-oligosaccharides (GOS) are carbohydrates found mainly in legumes and some vegetables. They're a FODMAP that can ferment in the gut, causing bloating and discomfort in sensitive people.
- Canned and rinsed legumes are lower in GOS than dried
- Start with smaller portions and build up tolerance
- Some people find beano-type enzymes helpful
- Firm tofu is lower in GOS than silken tofu
- Sprouted legumes may be better tolerated
Sensitivities
What tonic water contains
FODMAPs
Histamine & Amines
Plant compounds
Irritants
Additives
Allergens
Diet fit
Where tonic water fits
Therapeutic diets
Lifestyle diets
Religious diets
What to know about tonic water
Tonic water is the odd one out in the drinks list, because its distinctive trigger is not alcohol at all. Tonic contains quinine, the bitter alkaloid extracted from cinchona bark that started life as an antimalarial and is still a prescription drug, and it is the reason a glass of tonic glows blue under UV light. Regulators cap how much can go into a beverage: the US limit is 83 parts per million, the EU limit is 100 milligrams per litre, and labels must declare that quinine is present. At those levels a mixer sits far below any therapeutic dose and most people never register it. A minority genuinely react, because quinine hypersensitivity is immune-mediated rather than dose-related, which means a sensitised person can respond to the amount in one glass. On the food-chemistry side tonic is otherwise clean, grading A for histamine, salicylates, gluten, dairy and sulfites, but regular tonic is still a sweetened soft drink and grades C for FODMAPs and C for excess fructose.
Watch for
- Quinine is a pharmacologically active compound, not just a bitter flavouring, which is why its level in beverages is capped by law (83 ppm in the US, 100 mg per litre in the EU) and why its presence has to be declared on the label.The classic overdose picture, cinchonism, means ringing ears, headache, nausea and blurred vision, and a normal mixer sits nowhere near it
- Quinine hypersensitivity does not follow dose.The medical literature contains cases of quinine-induced thrombocytopenia, showing up as unexplained bruising, pinpoint red spots or nosebleeds, traced back to tonic water and bitter lemon in people who were already sensitised. It is rare, but it is the reason the FDA has repeatedly warned against off-label prescription quinine
- Quinine interacts with other medicines, including anticoagulants, digoxin and drugs that affect heart rhythm.The amount in a mixer is usually far too small to matter, but it is worth mentioning to a prescriber if tonic is a daily habit
- Regular tonic is a soft drink first.It grades C for FODMAPs and C for excess fructose, and in the US it is commonly sweetened with high fructose corn syrup. Slimline and diet tonics cut the sugar but keep the quinine, so they solve the FODMAP question and not the quinine one
- Clean on the usual sensitivity axes: A for histamine, histamine liberation, salicylates, gluten, dairy protein, sulfites and glutamates.If a gin and tonic reliably bothers you, this page and the gin page are the two halves to test separately
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GOS Guide
Everything you need to know about gos sensitivity and smart food choices.
Galacto-oligosaccharides (GOS) are carbohydrates found mainly in legumes and some vegetables. They're a FODMAP that can ferment in the gut, causing bloating and discomfort in sensitive people.
Sensitivity varies widely. What triggers one person may be fine for another. Track your reactions to find your personal threshold.
These foods are generally well-tolerated for GOS sensitivity:
View all safe options
These foods have moderate levels and may be tolerated in small amounts:
These foods are high in gos and may trigger symptoms:
View full list
If you're sensitive to GOS, consider these strategies:
- 1Canned and rinsed legumes are lower in GOS than dried
- 2Start with smaller portions and build up tolerance
- 3Some people find beano-type enzymes helpful
- 4Firm tofu is lower in GOS than silken tofu
- 5Sprouted legumes may be better tolerated
Pro tip: Keep a food diary to track your reactions. The Triggerbites app makes this easy with automatic pattern detection.
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Get the AppFAQ
Is tonic water high in GOS?
GOS: low signal for most people.
Can I still eat tonic water if I'm sensitive to GOS?
Usually fine in normal portions.
What else should I check?
Check Acidic Foods, Inflammation, and AIP next for a fuller picture.