Adults choosing a fizzy drink for evening viewing
Flavour and can size matter, but so does the time until bed. The European Food Safety Authority says caffeine consumed close to bedtime may affect sleep in some adults.
Who is this choice for?
Shoppers comparing sugars per can
A zero-sugar variety and a sweetened drink can look similar on the shelf. Compare the nutrition information for the amount you expect to drink, particularly when the can accompanies snacks.
People buying for a mixed-age household
Check high-caffeine warnings rather than treating a fruit flavour or zero-sugar label as a sign of suitability for everyone. The Department of Health and Social Care has announced an under-16 sales ban for high-caffeine energy drinks in England from April 2027; that announcement should not be assumed to describe the rules elsewhere in the UK.
What should you check before buying?
Start with the amount in the container you would open, then compare the drink’s sweetness, flavour and size against what you want alongside your snacks.
| Priority | What to check | Your needs |
|---|---|---|
| Caffeine and bedtime | Read caffeine per can, or calculate it from mg per 100ml and can volume. Account for other caffeine you have consumed; the European Food Safety Authority says 100mg close to bedtime may affect sleep in some adults. | I want to know how much caffeine I would drink while watching, especially if the programme ends near bedtime. If I want to avoid it, I can choose a non-caffeinated sparkling drink. |
| Sugars per container | Compare sugars for the full can, not just per 100ml. Tesco lists 0g sugars per 500ml for Relentless Mango Ultra and 58g per 500ml for Relentless Lemon Ice; those figures describe different variants. | If I am also having snacks, I want to know whether the drink adds sugars to the occasion. A shared brand or sparkling format does not settle that question. |
| Can size and flavour | Confirm that the specific variant is described as sparkling or carbonated. Check its stated flavour and whether the pack contains 250ml, 355ml or 500ml cans. | I might prefer a smaller can for a short programme, or a larger drink to sip through a film. I would still check caffeine and sugars for the size I choose. |
| Pack warnings | Read the high-caffeine warning on the specific drink. Tesco’s Red Bull Sugarfree listing says it is not recommended for children or pregnant or breast-feeding women; warnings can differ between products. | When buying for someone else, I need to check the label rather than assume that zero sugar or a fruit flavour makes an energy drink suitable for them. |
What is easy to overlook?
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Comparing caffeine only per 100ml
The concentration does not tell you how much is in the container. Tesco lists Red Bull Sugarfree at 32mg per 100ml, which is 80mg in its 250ml can; Sainsbury’s lists 160mg in a 500ml Monster Ultra can.
Use the stated per-can figure where available. Otherwise, multiply the amount per 100ml by the can volume divided by 100, and consider when you plan to drink it.
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Assuming one brand has one sugar profile
Tesco lists 0g sugars in a 500ml Relentless Mango Ultra and 58g in a 500ml Relentless Lemon Ice. Choosing by brand alone misses a substantial difference between those variants.
Read the nutrition panel for the exact flavour and compare sugars for the whole container.
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Using zero sugar as a suitability shortcut
Zero sugar does not mean caffeine-free. High-caffeine product warnings remain relevant to children and pregnant or breast-feeding people; the NHS also identifies energy drinks as a caffeine source during pregnancy.
Check the specific pack warning and caffeine amount, regardless of its sugar content.
Brand and range examples
These examples show why it helps to compare individual variants rather than make a choice from the brand name alone.
Red Bull
Red Bull Sugarfree is a carbonated 250ml option. Tesco lists its caffeine at 32mg per 100ml, equivalent to 80mg per can.
- Tesco’s listing gives 0g sugars for the Sugarfree variant.
- Its high-caffeine label says it is not recommended for children or pregnant or breast-feeding women. The smaller can does not remove the need to consider bedtime.
Monster
Sainsbury’s describes Monster Ultra as a carbonated, lighter-tasting 500ml drink with zero sugar.
- The listing states the caffeine amount for a full can: 160mg.
- That full-can amount matters when choosing a drink for late-evening viewing.
Relentless
Tesco lists sparkling 500ml Relentless variants with markedly different sugar amounts.
- Mango Ultra is listed with 0g sugars per 500ml; Lemon Ice offers a sparkling lemon flavour.
- Lemon Ice is listed with 58g sugars per 500ml. Check the exact variant’s nutrition panel and high-caffeine warning.
Lucozade
Lucozade Alert Zero Sugar Mango Peachade and Lucozade Energy Original are different sparkling drinks, not interchangeable sugar profiles.
- Tesco lists the 250ml Alert Zero Sugar Mango Peachade with 80mg caffeine and 0.5g sugars.
- Tesco lists 11.2g sugars per 250ml serving for Energy Original; check the bottle’s serving information if drinking more than that.
Sparkling energy drinks on Joybuy
These options include smaller cans, larger cans and different flavours for a TV-night drink. Check the exact pack’s caffeine, sugars and warnings before deciding what to open in the evening.
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Red Bull Sugarfree Energy Drink 250ml, 24 pack
The 250ml can provides a defined serving for a TV night. Tesco lists this Sugarfree variant at 32mg caffeine per 100ml, equivalent to 80mg per can, and 0g sugars; consider the caffeine if bedtime is near.
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Monster Ultra White 12x500ml
The 500ml can is a larger format for a longer viewing session. Check caffeine and sugars on this White variant’s label rather than applying figures from a different Monster Ultra listing.
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CELSIUS Watermelon Strawberry 12x355ml
The named watermelon and strawberry variant comes in 355ml cans. If it is for evening viewing, check the can’s caffeine amount, sugars and product warnings before choosing it.
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Red Bull Energy Drink 250ml, 8 pack
This is the named Energy Drink variant in 250ml cans, rather than the Sugarfree pack above. Compare the two variants’ sugars on their own labels, as well as caffeine per can, before choosing one with snacks.
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Rockstar Blueberry & Pomegranate 12x500ml
The blueberry and pomegranate variant comes in 500ml cans. For a TV night, compare caffeine and sugars for the whole can, not just the figures per 100ml.
Frequently asked questions
How do I compare caffeine between different can sizes?
Compare the amount in the whole can. Tesco lists 32mg per 100ml for a 250ml Red Bull Sugarfree, equivalent to 80mg per can, while Sainsbury’s lists 160mg per 500ml Monster Ultra can. Use the figure on the exact variant you are buying.
Does zero sugar make an energy drink a better late-night choice?
Not if your main concern is avoiding caffeine near bedtime. A zero-sugar drink can still contain caffeine; the European Food Safety Authority says a 100mg dose close to bedtime may affect sleep in some adults. Check both the can’s caffeine amount and when you plan to drink it.
Can caffeine in a TV-night drink affect sleep?
Yes, it may affect some adults. The European Food Safety Authority says a single 100mg dose close to bedtime may affect sleep duration and patterns; individual responses vary. A non-caffeinated sparkling drink avoids adding caffeine to that occasion.
Is there a UK-wide under-16 sales ban on high-caffeine energy drinks?
Do not assume one England announcement applies across the UK. The Department of Health and Social Care announced that sales of high-caffeine energy drinks to under-16s in England will be banned from April 2027. Check the applicable rules where you shop rather than extending that announcement to Scotland, Wales or Northern Ireland.
What should I check when buying an energy drink during pregnancy?
Check the caffeine amount and the product warning. The NHS advises pregnant people not to have more than 200mg caffeine a day and identifies energy drinks as one source; Tesco’s Red Bull Sugarfree listing also says its high-caffeine drink is not recommended for pregnant or breast-feeding women.