For a fizzy school-holidays lunch drink, choose plain soda water or sparkling water if you want to avoid sugar and sweeteners; choose a diet or slimline tonic if tonic flavour matters, after checking its ingredients. Do not assume that “light” means sugar-free: Fentimans lists 3.4g sugars per 100ml for its Naturally Light Tonic Water.
If children or teenagers want something fizzy with lunch, the sugar in a mixer matters alongside the rest of the meal. The NHS advises families to cut down on free sugars and gives age-specific daily limits for children.
If plain sparkling water will not provide the bitter tonic flavour you want, compare diet, slimline and light tonics by their sugars per 100ml and ingredients. Those descriptions do not all mean the same thing.
Compare the nutrition panels on branded and own-label mixers using the same volume, then read the ingredients. GOV.UK explains that back-of-pack nutrition information is required and that front-of-pack traffic-light labels, where present, can help with comparisons.
Start with the type of drink you want, then compare sugars per 100ml, ingredients and the amount you plan to serve.
| Priority | What to check | Your needs |
|---|---|---|
| Sugar | Read “of which sugars” per 100ml, not just “light” on the front. Fentimans lists 3.4g per 100ml for Naturally Light Tonic Water; Tesco lists 0g for Schweppes Slimline Tonic Water. | I want to know how much sugar the drink adds to a lunch that may include other sweet foods. |
| Drink type | Decide whether plain fizz or bitter tonic flavour is wanted. Fentimans lists 0g sugars per 100ml for its Soda Water; tonic products have different ingredients. | Plain sparkling water works for me, or I specifically want the taste of tonic. |
| Ingredients | Check the exact pack for sweeteners and quinine. Tesco lists aspartame and quinine for Schweppes Slimline; Sainsbury’s lists acesulfame K and sucralose for its Diet Indian Tonic Water. | Sweeteners or tonic ingredients may affect which drink I choose for the person having lunch. |
| Portion | Compare products per 100ml first, then calculate the sugars in the bottle, can or glass being served. Check the stated serving size against the amount actually poured. | A small can and a larger glass are different portions, even when their labels use the same per-100ml figure. |
“Light” can describe a product that still contains sugar. Fentimans Naturally Light Tonic Water lists 3.4g sugars per 100ml.
Check the sugars figure on the exact product and calculate it for the portion you will serve.
They offer different flavours and ingredients. Tesco lists quinine and aspartame for Schweppes Slimline Tonic Water; Fentimans Soda Water lists carbonated water, salt and sodium bicarbonate.
Choose a plain fizzy water if you do not want tonic flavour or sweeteners. Otherwise, read the tonic’s ingredient list before buying a multipack.
Serving sizes can differ between products, so two per-serving sugar figures may describe different volumes.
Compare sugars per 100ml first, then use the amount you intend to pour to work out the portion figure.
These examples illustrate different label descriptions and ingredients; check the particular variant rather than applying one product’s figures to a whole range.
Slimline Tonic Water is a tonic-flavoured option for comparing sugar and sweetener information.
Its Soda Water and Naturally Light Tonic Water show why plain fizz and light tonic should be compared separately.
Its Refreshingly Light tonic range includes different flavour variants.
Its own-label Diet Indian Tonic Water provides another diet-tonic label to compare.
Its product information allows comparison between a listed slimline tonic and a light tonic.
These options include plain sparkling mineral water, a slimline tonic and two Refreshingly Light tonics. If avoiding sugar is the priority, compare the exact nutrition panels before choosing between them.
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For a lunch where tonic flavour matters, this slimline option comes in 150ml cans. Joybuy’s product information lists 0g sugars and 2kcal per 100ml, with quinine and aspartame in the ingredients; check the pack’s phenylalanine declaration for the intended drinker.
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A plain sparkling-water option when tonic flavour is not needed. The pack contains six 0.5L bottles; compare the amount poured with the portion you intend to serve at lunch.
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An Indian tonic option in 150ml cans for a lunch where tonic flavour is wanted. “Refreshingly Light” is not a zero-sugar statement: check this variant’s sugars per 100ml and the amount in a can before choosing it.
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A Mediterranean tonic variant in a pack of eight 150ml cans. If limiting sugar is the reason for choosing a mixer, read this variant’s nutrition panel rather than relying on “Refreshingly Light” in its name.
No, not necessarily. Fentimans lists 3.4g sugars per 100ml for Naturally Light Tonic Water, while Tesco lists 0g per 100ml for Schweppes Slimline Tonic Water. Compare the nutrition panels rather than the front-of-pack descriptions.
Look at a plain soda water and check its label. Fentimans Soda Water lists 0g sugars per 100ml and gives carbonated water, salt and sodium bicarbonate as its ingredients; it will not taste like tonic.
Compare sugars per 100ml first, then calculate the amount in the portion you will serve. A per-serving figure can be misleading when the products use different serving volumes.
No. Tesco lists aspartame and quinine for Schweppes Slimline Tonic Water, and Sainsbury’s lists acesulfame K and sucralose for its Diet Indian Tonic Water. Read the exact pack’s ingredients and declarations for the intended drinker.
Check the sugar in the amount being served alongside the rest of the lunch. The NHS advises families to cut down on children’s free sugars; a “light” tonic may still contain sugar, so its label matters more than its name.