Tonic Water
Food · Drink · Food, Typed Supps
As sugary as lemonade, and the only mixer containing an actual drug.
Stage by stage
- Bitter mask (Taste): Quinine’s bitterness cancels the perception of 8.8 g of sugar per 100 g.
- Free sugar (Circulation): Identical to lemonade, and far more often left off a food diary.
- Quinine (Liver): A real drug at therapeutic doses; capped far below that in a beverage.
- Hypersensitivity (Platelets): Quinine-induced immune thrombocytopenia is idiosyncratic and not dose-dependent.
Timing
No timing to manage. The one thing to know is that quinine reactions, when they happen, are idiosyncratic rather than dose-related.
Time to effect
- 15–30 min: Glycaemic peak, same as any sugared soft drink.
- Unpredictable: Quinine hypersensitivity, in the small number of people who have it.
Allergens
None of the fourteen major allergens. Derived from what this food is, not from a product label.
Eating patterns
Fits: Vegan, Vegetarian, Pescatarian, Halal, Kosher, Gluten-free. Depends on the product: Keto, Low-FODMAP.
Cost band
Cheap — roughly £2 per kg, as a band midpoint rather than a price.
Key nutrients
Nutrition per 100g
- Calories: 34
- Carbohydrate: 8.8g
- of which sugars: 8.8g
- Sodium: 12mg
Food vs. supplement
Tonic water is the only common soft drink whose flavouring is a pharmaceutical. It sits at a legal concentration well below any therapeutic effect, which is exactly why it cannot do anything for leg cramps — and why the folk remedy persists anyway.
Kitchen tip
If you are counting the drink, count the tonic. It is usually the larger half of a gin and tonic by both volume and calories.
Common myth
“Tonic water helps with leg cramps.” In reality: The idea comes from quinine, which was once prescribed for cramps — and which regulators have since warned against for exactly that use, after reports of serious blood and heart effects. The concentration in tonic water is a fraction of a therapeutic dose, so it cannot deliver the benefit, while quinine hypersensitivity reactions are idiosyncratic and have been reported at beverage doses. You get the sugar and the risk without the drug effect.
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