The best low sugar drink is one you enjoy enough to keep choosing. It also has a sugar figure you can check on the label. Plain water, unsweetened tea and flavoured sparkling water all qualify. So does raw kombucha, which averages 16 kcal and 3.0g of sugar per 100ml. A classic full-sugar cola has 10.6g of sugar per 100ml. If you want a fizzy, tea-based drink with real flavour, our raw, small-batch kombucha is brewed for exactly that swap.
This guide shows you how to read a UK label in ten seconds, how the main types of low sugar drink compare, how many calories are in kombucha, and how to build a routine that sticks.
TL;DR
- Compare sugar per 100ml, not per bottle. Under 5g per 100ml counts as low on the NHS scale, and drinks labelled “low in sugars” must have no more than 2.5g.
- Adults are advised to keep free sugars to no more than 30g a day. One 330ml can of full-sugar cola has about 35g.
- Kombucha averages 16 kcal and 3.0g sugar per 100ml, so a 330ml bottle works out at roughly 53 kcal and 10g sugar.
- Water, unsweetened tea, sparkling water and no-sugar sodas all cut sugar. Kombucha adds flavour and a living culture without artificial sweeteners.
- Subscribe and Save is £25.00 per month with free UK delivery, so a low sugar swap becomes a routine rather than a weekly shop.
Table of Contents
- How to read a drinks label in ten seconds
- What counts as “low sugar”?
- How much sugar is too much in a day?
- The main types of low sugar drink compared
- How many calories are in kombucha?
- What about sweeteners?
- Why kombucha suits people who want less sugar but real flavour
- Making the swap stick: a simple routine
- A monthly supply of low sugar kombucha
- Safe use
- FAQ
- Sources
How to read a drinks label in ten seconds
Every pre-packed drink in the UK carries a nutrition panel on the back or side. The NHS explains that it shows energy in kJ and kcal, plus fat, saturates, carbohydrate, sugars, protein and salt, per 100g or 100ml and sometimes per portion.
Look for the line “of which sugars” in the per 100ml column. That column is the only fair way to compare a 250ml can with a 500ml bottle. Per-portion figures can mislead, because Action on Sugar notes that a bottle can hold two or more portions, so check the stated portion size before you trust a number.
If the front of the pack uses traffic-light colours, red means high, amber medium and green low. The NHS also suggests checking those colours when you pick a drink.
What counts as “low sugar”?
There is no single number, because different bodies draw different lines. Here are the ones you will meet most often.
| Where the line comes from | Low | High |
|---|---|---|
| UK “low in sugars” claim on a drink | No more than 2.5g per 100ml (legislation.gov.uk) | n/a |
| “Low energy” claim on a drink | No more than 20 kcal per 100ml (legislation.gov.uk) | n/a |
| Colour-coding for drinks | Less than 2.5g per 100ml | More than 11.25g per 100ml or 13.5g per portion (Action on Sugar) |
| General NHS guide for products | 5g or less per 100g | More than 22.5g per 100g (NHS) |
A drink can therefore sit in the amber band of the strict drinks scale and still be low by the general NHS guide. Bristol City Council’s public-health guidance also uses 5g per 100ml as its line for a low-sugar drink. A drink that also carries a “zero” or “no added sugar” label is a different thing again: “no added sugar” describes the recipe, not the total sugar in the glass.
How much sugar is too much in a day?
The NHS states that free sugars should make up no more than 5% of daily energy. That is 30g a day for adults, roughly seven sugar cubes. Children aged 7 to 10 should have no more than 24g, ages 4 to 6 no more than 19g, and ages 2 to 3 no more than 14g.
Now put a drink against that limit. A 330ml can of full-sugar cola has about 35g, which is more than an adult’s entire day in one can. Action on Sugar says sugary drinks can account for up to 42% of daily sugar intake. That is why swapping the drink is often the single easiest change.
The main types of low sugar drink compared
Here is how the common options line up, using published figures where they exist.
| Type of drink | Typical sugar and calories | What you get |
|---|---|---|
| Raw kombucha | Average 3.0g sugar and 16 kcal per 100ml (BBC Good Food) | Tea-based, naturally fizzy, flavoured with botanicals, no artificial sweeteners |
| Flavoured sparkling water | One 330ml can has 10 kcal and 0g sugars | Light, crisp, very low calorie |
| No-sugar cola and lemonade | 1 kcal per 100ml and 0g sugars for one lemon-lime zero | Sweet taste from sweeteners |
| No-sugar sodas with a stronger flavour | 0.7 kcal per 100ml and 0g sugars for one example | Sweeteners such as acesulfame K and aspartame |
| Juice-based “zero added sugar” sodas | One range has under 22 calories per 330ml can | Fruit flavour from real juice |
| Full-sugar cola | 10.6g sugar per 100ml, 35g per can | Reference point only |
Unsweetened tea and coffee also count towards your fluids. The NHS lists water, lower-fat milk and lower-sugar drinks including tea and coffee in the 6 to 8 cups or glasses of fluid a day it recommends.
The table also shows the real difference between types. Sparkling water and no-sugar sodas win on raw calorie count. Kombucha sits in the middle on numbers but is the only one here that is tea-based and made through fermentation, with its flavour coming from the brew itself.
How many calories are in kombucha?
The average kombucha has 16 kcal (67 kJ) per 100ml, with 3.0g of carbohydrate, all of it sugar, and no protein. BBC Good Food adds that the figures vary by product, so the label on your bottle is the number that counts.
Here is a worked example for a 330ml serving at that average:
- Calories: 3.3 × 16 = about 53 kcal
- Sugar: 3.3 × 3.0 = about 9.9g
That is roughly a third of an adult’s 30g daily guide. Compare it with the same-sized can of full-sugar cola at about 35g and the gap is plain. It is also well under the 5g per 100ml line that the NHS and Bristol City Council use for low sugar.
Why does a fermented drink contain sugar at all? Kombucha starts as sweetened tea. The living culture eats much of that sugar as it ferments, and what remains is the sugar on the label. How long the brew ferments changes the figure, which is one reason two kombuchas can differ. We cover this in more depth in our guide to sugar content in kombucha compared with other drinks.
If you manage blood sugar for a medical reason, talk to your GP or diabetes nurse before changing your drinks. Our note on diabetes and kombucha explains the general picture.
What about sweeteners?
Most zero-sugar fizzy drinks get their sweetness from sweeteners. The NHS lists those approved in the UK: acesulfame K (E950), aspartame (E951), erythritol (E968), saccharin (E954), sorbitol (E420), steviol glycosides (E960), sucralose (E955) and xylitol (E967). Each has an acceptable daily intake set by the government.
The NHS also reports that short-term trials show drinks with no-calorie sweeteners, used instead of sugary drinks, can help lower energy intake and weight gain. It found no evidence that sweeteners stimulate appetite in humans.
Two practical points for families. Bristol City Council’s guidance says sweetened drinks are not recommended for children under five. It also notes that the citric acid in many of them is bad for teeth. The colourings in some sodas can matter too: one major supermarket listing carries a warning about two colours that may affect activity and attention in children.
If you would rather skip sweeteners altogether, a tea-based drink flavoured with botanicals is the straightforward route.
Why kombucha suits people who want less sugar but real flavour
Many people cut sugar and then miss the drink itself: the fizz, the complexity, the ritual of something that is not water. That is where kombucha fits. Ours is raw and unpasteurised, brewed in small batches in the UK to a traditional Persian family recipe, so the living culture stays in each bottle. It is designed as a refreshing alternative to sugary drinks.
The flavours lean towards tea and botanicals rather than sweet confectionery:
- Lemon, Ginger & Ginseng, a bright, zesty option
- Pineapple, Mango & Ginger, for fruit lovers who want something lively
- Lemon Verbena, Nettles & Peppermint, a limited edition herbal blend
- Saffron, Cardamom & Rose, Hibiscus, and Rose & Mint, among others in the range
If you are new to the drink, our guide to what kombucha is covers the basics. For a straight answer on the other common question, we have a page on alcohol in kombucha.
Making the swap stick: a simple routine
Switching drinks fails when it depends on willpower at the shop. These steps keep it easy.
- Find your baseline. Note the drinks you have in a normal week and look up the per 100ml sugar on each label. Multiply by the bottle size to see the real total.
- Replace the biggest sugar source first. If it is a daily cola or sweetened juice, start there. The NHS suggests limiting fruit juice and smoothies to one small 150ml glass a day.
- Pick a swap that matches the occasion. Water or unsweetened tea for most of the day. A flavoured kombucha when you want something that feels like a treat, such as with lunch or in the late afternoon. Our note on the best time to drink kombucha can help you place it.
- Read the portion size. One bottle may hold more than one portion, so use the per 100ml column for comparison and the total for your daily count.
- Make it automatic. A drink that arrives at your door is a drink you will actually have in the fridge.
A monthly supply of low sugar kombucha
Our Subscribe and Save plan is £25.00 per month, with free UK delivery and priority access to new or limited flavours. You can also buy one-off or curate a mixed selection, which is a good way to find the flavours you like before settling into a monthly order. Local delivery for one-off orders is £2.22 and delivery to the rest of the UK is £5.55, as set out on our shipping policy.
If you want kombucha in the fridge without thinking about it, you can start a Subscribe and Save order and swap your sugary drink for a raw, small-batch alternative.
Safe use
Kombucha is not for everyone. BBC Good Food advises that it is not recommended for women who are pregnant or breastfeeding, or for people with a compromised immune system. If either applies to you, speak to your GP or midwife before drinking it.
If you are choosing drinks for children, stay within the daily sugar limits above, and for under-fives follow the guidance from your health visitor or GP.
Whatever you drink, plain water remains the baseline. The NHS counts it, alongside lower-sugar drinks, towards your daily fluids, and kombucha is an addition to that mix rather than a replacement for it.
FAQ
How many calories are in kombucha?
The average is 16 kcal per 100ml, according to BBC Good Food, which is about 53 kcal for a 330ml bottle. Values vary between brews, so check the nutrition panel on the bottle you buy.
What drinks have 0 calories and 0 sugar?
Plain still and sparkling water have none, and so do unsweetened tea and black coffee without milk. Some flavoured sparkling waters come very close: a 330ml can listed at 10 kcal and 0g sugars shows how low they go. Always confirm on the label, because “zero” products can still carry a trace of energy.
What are the healthiest fizzy drinks?
Look for low sugar per 100ml, a short ingredients list and a portion size you can see. Sparkling water and kombucha both fit that description. If you prefer sweet no-sugar sodas, check the sweeteners against the NHS list of approved ones.
Is kombucha a low sugar drink?
At an average of 3.0g per 100ml, it is under the 5g per 100ml line used by Bristol City Council for low-sugar drinks. It is also far below the 10.6g per 100ml of a full-sugar cola. The label on each bottle gives its exact figure.
Sources
- Top 5 health benefits of kombucha, BBC Good Food
- How much sugar is in Coca-Cola Original Taste?, Coca-Cola
- Food labels, NHS
- Water, drinks and hydration, NHS
- Sugar: the facts, NHS
- The truth about sweeteners, NHS
- Understanding food labels, Action on Sugar
- Nutrition and health claims regulation annexes, legislation.gov.uk
- Reducing sugar consumption, Bristol City Council
- Sprite Zero Sugar 8x330ml, Morrisons
- Irn-Bru Sugar Free, Waitrose
- DASH Orange Sparkling Water
- Zero Added Sugar range launch, Retail Times