Lunch drinkers comparing sugar
If you want cola with lunch but are looking at zero-sugar options, check the sweeteners and caffeine as well as the sugar figure. Those details vary by variant.
Who is choosing?
People avoiding afternoon caffeine
Look for a cola specifically labelled caffeine-free. A diet or zero-sugar name alone does not establish whether the drink contains caffeine.
Occasional regular-cola buyers
If the regular recipe is what you prefer, use the sugar amount for the can you will drink, not just the figure per 100ml, when considering the rest of your day.
What matters on the label?
Start with sugar and caffeine, then check ingredients and whether the pack size works for an individual lunch.
| Priority | What to check | Your needs |
|---|---|---|
| Sugar per can | Compare sugars per serving on the same volume basis. If only a per-100ml figure is shown, use the container volume to work out the amount you would drink. | I prefer regular cola, but want to know the sugar amount in my lunch can. Coca-Cola GB lists 10.6g per 100ml for Original Taste, or about 35g in 330ml; the NHS advises adults to have no more than 30g of free sugars a day. |
| Caffeine | Check the exact variant name and ingredients for caffeine. Do not treat a zero-sugar or diet label as a caffeine-free label. | I want cola later in the day without caffeine. Pepsi UK lists caffeine in Pepsi Max, while its Pepsi Max Caffeine-Free variant is explicitly caffeine-free. |
| Sweeteners | Read the ingredients for specific sweeteners and any source-of-phenylalanine statement on the exact pack. | If an ingredient matters to me, I need more than a zero-sugar label. Pepsi UK lists sweeteners for Pepsi Max, and the product carries a source-of-phenylalanine statement. |
| Pack format | Check the volume you intend to drink and any storage instructions after opening a larger bottle. | For an occasional desk lunch, I may find an individual can simpler to portion than an opened bottle. Sainsbury's instructs buyers to refrigerate its Diet Cola 2L after opening and consume it within three days. |
Common buying mistakes
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Assuming zero sugar means no caffeine
A zero-sugar cola can still contain caffeine: Pepsi UK lists it in Pepsi Max.
If you want to avoid caffeine, choose a variant explicitly labelled caffeine-free and check its ingredients.
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Comparing sugar figures without checking volume
A per-100ml figure is not the amount in a full can. Coca-Cola GB lists 10.6g sugars per 100ml for Original Taste, which is about 35g in 330ml; the NHS adult daily free-sugar guideline is 30g.
Use the per-can figure when available, or calculate it from the labelled volume before comparing regular colas.
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Opening a large bottle for an occasional lunch
Storage instructions can matter if you only want one drink. Sainsbury's says its Diet Cola 2L should be refrigerated after opening and consumed within three days.
Compare that storage window with how often you would use the bottle; an individual can may be more practical for an occasional lunch.
Brand and own-label references
These examples show why the exact variant matters; a brand name alone does not tell you its sugar, caffeine or sweetener content.
Coca-Cola
Coca-Cola GB lists Original Taste and a separate Zero Sugar Caffeine Free variant.
- Original Taste lists 10.6g sugars per 100ml and caffeine flavouring, according to Coca-Cola GB.
- The caffeine-free zero-sugar variant is a different product; check the name on the pack rather than assuming all zero-sugar variants are caffeine-free.
Pepsi
Pepsi UK lists regular Pepsi, Pepsi Max and Pepsi Max Caffeine-Free as distinct cola variants.
- Pepsi UK lists 15g sugars per 330ml can for regular Pepsi and zero sugar for Pepsi Max Caffeine-Free.
- Standard Pepsi Max contains caffeine despite its zero-sugar label; check which Max variant you have selected.
Tesco
Tesco lists own-label Classic Cola and Diet Cola in its grocery range.
- The listed options include regular and diet colas in 330ml-can multipacks.
- Check the current pack or product page for sugars, caffeine and sweeteners before comparing a Tesco variant with another cola.
Sainsbury's
Sainsbury's lists Diet Cola in a 2L bottle, a different format from an individual lunch can.
- Its product information lists less than 0.5g sugars per 100ml and names caffeine, acesulfame K and sucralose in the ingredients.
- Sainsbury's instructs buyers to refrigerate the bottle after opening and consume it within three days.
Cola cans on Joybuy
These multipacks contain individual 330ml cans for a desk lunch. They include regular, zero-sugar and caffeine-free variants; check the exact pack when sugar, caffeine or sweetener ingredients determine your choice.
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Diet Coke No Caffeine, 24 × 330ml
A caffeine-free variant in individual cans for lunch. Check the current pack for its sugar figure, sweeteners and ingredient statements if these affect your choice.
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Pepsi Max Caffeine Free, 24 × 330ml
For a lunch can when both sugar and caffeine matter: Pepsi UK describes this variant as zero sugar and caffeine-free. Check the current pack's sweeteners and source-of-phenylalanine statement if relevant to you.
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Pepsi Max, 24 × 330ml
A zero-sugar option if caffeine is acceptable: Pepsi UK lists caffeine in Pepsi Max's ingredients. Its individual 330ml cans make the serving volume clear; check the pack for sweeteners and ingredient statements.
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Coca-Cola Zero Sugar, 18 × 330ml
A zero-sugar variant in individual 330ml cans. If you also want to avoid caffeine, check the exact pack rather than confusing it with Coca-Cola's separately named Zero Sugar Caffeine Free variant.
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Coca-Cola Original Taste, 24 × 330ml
A regular-cola choice in individual cans. Coca-Cola GB lists 10.6g sugars per 100ml for Original Taste, equivalent to about 35g in a 330ml can; consider that amount alongside the NHS adult daily free-sugar guideline of 30g.
Questions about choosing cola
Is zero-sugar cola automatically caffeine-free?
No. Pepsi UK lists caffeine in Pepsi Max despite its zero-sugar description. If you want to avoid caffeine, look for an explicitly caffeine-free variant, such as Pepsi Max Caffeine-Free, and check the exact pack.
Can a regular cola can exceed the NHS adult free-sugar guideline?
Yes. Coca-Cola GB lists 10.6g sugars per 100ml for Original Taste, or about 35g in 330ml. The NHS advises adults to have no more than 30g of free sugars a day, so check the can volume and consider other food and drinks that day.
Do zero-sugar colas use sweeteners?
The named zero-sugar and diet examples here do: Pepsi UK lists sweeteners for Pepsi Max, and Sainsbury's lists acesulfame K and sucralose for its Diet Cola. Read the exact product's ingredients if a particular sweetener or source-of-phenylalanine statement matters to you.