For an adult office packed lunch, a 250ml Red Bull Sugar Free can offers a smaller sugar-free portion with 80mg caffeine, calculated from the 32mg per 100ml stated by Tesco Groceries. A larger zero-sugar can may suit a different portion preference, but check its whole-can caffeine figure: Sainsbury’s Monster Ultra listing gives figures that do not agree with each other. Relentless Origin and Lucozade Energy Original contain sugar; compare the amount in the container you plan to drink rather than choosing by the word ‘energy’ alone.
A 250ml format may fit a single lunch break better than a 500ml can. Tesco Groceries lists 0g sugars per 100ml and 32mg caffeine per 100ml for Red Bull Sugar Free 250ml, equivalent to 80mg caffeine in the can.
A 500ml zero-sugar can and a sweetened 500ml can answer different preferences. Sainsbury’s describes Monster Ultra as zero sugar; Tesco Groceries lists 19g sugars per 500ml can for Relentless Origin. Check caffeine for the whole can as well as sugar.
Read the label for the portion you intend to drink and account for caffeine from other drinks. The NHS advises consuming caffeine in moderation and notes that sensitivity varies between people.
Start with the whole can or bottle, then compare sugar and whether the format works for your lunch break.
| Priority | What to check | Your needs |
|---|---|---|
| Whole-container caffeine | Check caffeine in mg per 100ml and multiply by the container size. Tesco Groceries states 32mg per 100ml for Red Bull Sugar Free 250ml, or 80mg per can. Sainsbury’s Monster Ultra listing says both 30mg per 100ml and 160mg per 500ml can; those figures do not agree, so check the can itself. | I want to know how much caffeine I would have at lunch, including any coffee, tea or cola I also plan to drink. |
| Sugars and energy | Compare the sugars line for the amount you will drink. Tesco Groceries lists 0g sugars per 100ml for Red Bull Sugar Free, 19g sugars and 86kcal per 500ml for Relentless Origin, and 4.5g sugars per 100ml for Lucozade Energy Original. Sainsbury’s describes Monster Ultra as zero sugar. | A sugar-free drink matters to me, or I am happy with a sweetened one once I have checked the whole-container amount. |
| Portion and storage | Decide whether you want a 250ml can or a 500ml can or bottle. For Lucozade Energy Original 500ml, Tesco Groceries says to refrigerate the bottle after opening and drink it within four days. | Will I finish the drink at lunch? If not, I need to be able to follow the bottle’s storage instructions. |
Container size changes the total. Tesco Groceries states 32mg caffeine per 100ml for Red Bull Sugar Free 250ml, which works out to 80mg per can. The caffeine figures within Sainsbury’s Monster Ultra listing do not agree when scaled to its 500ml can.
Use a clearly stated whole-container amount where available. If the concentration and can total conflict, check the physical label before relying on either figure.
Tesco Groceries lists 19g sugars per 500ml can for Relentless Origin and 4.5g per 100ml for Lucozade Energy Original. These are different choices from the sugar-free drinks described in the Red Bull Sugar Free and Monster Ultra listings.
Read the nutrition panel and scale a per-100ml value to the amount you expect to drink.
Tesco Groceries lists caffeine as an ingredient in Lucozade Energy Original, but that ingredient entry does not give an amount in mg.
If you need a precise caffeine figure, inspect the bottle for the stated amount or choose a drink whose label provides one.
The Sugar Free 250ml can is a smaller-format reference for a sparkling, sugar-free packed-lunch drink.
Monster Ultra is a carbonated, zero-sugar option in 500ml cans.
Origin is a sweetened, carbonated 500ml energy drink rather than a zero-sugar option.
Original is a sparkling glucose drink in a 500ml bottle, distinct from the zero-sugar can options.
These cans include smaller and larger formats, sugar-free choices and sweetened choices for an adult packed lunch. Compare the label of the particular pack you choose, especially for whole-can caffeine and sugars.
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The 355ml cans offer a portion between the 250ml and 500ml formats discussed above. Check the caffeine and sugars on this pack when planning a lunch drink.
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A larger-can option for someone seeking zero sugar. Check the caffeine stated on this pack for the full 500ml can, rather than relying on a figure from another listing.
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A smaller sugar-free can for a single lunch break. Check the pack’s caffeine warning and account for any other caffeinated drinks you plan to have.
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This 500ml-can format is another option if you are considering a larger lunch drink. Check the sugars and whole-can caffeine on this variant before choosing it over a sugar-free can.
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A smaller-can alternative if sugar-free is not a requirement. Check this variant’s sugars and caffeine separately from the Sugarfree version; sharing a can size does not make their nutrition labels the same.
Compare the amount in the whole can: multiply mg per 100ml by the volume in hundreds of millilitres. Tesco Groceries lists 32mg per 100ml for Red Bull Sugar Free 250ml, giving 80mg per can. If a listing’s concentration and whole-can figure disagree, as they do on the Sainsbury’s Monster Ultra listing, check the physical can.
No. Zero sugar answers a sugar preference, but can size and whole-can caffeine still matter. Red Bull Sugar Free comes in a 250ml can, while the Monster Ultra format described by Sainsbury’s is 500ml; check the caffeine on the particular pack before choosing.
If you are choosing a drink primarily for hydration, the NHS identifies water as an option and advises consuming caffeine in moderation. Consider the energy drink separately as a caffeinated choice.
Tesco Groceries gives product-specific instructions to refrigerate Lucozade Energy Original after opening and drink it within four days. Check that you can store an opened bottle accordingly if you plan to save some for later.