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The Healf Source
Behind The Sugar-Free Label: The Sweet Truth
From sneaky sweeteners to gut disruptors, here’s what you need to know about the hidden ingredients and marketing traps.
Written by: Samantha Nice
Written on: July 24, 2025
‘Sugar-free’, ‘no added sugar’, or ‘zero sugar’ might feel like green lights to dive into a snack or soda, especially if you’re trying to avoid the pitfalls of a sugar surge. But with growing awareness around what we consume, a key question arises: is sugar-free really a healthier choice? Or is it just clever marketing?
It’s important to understand that sugar itself isn’t inherently bad, especially when it’s naturally present in whole foods and eaten in moderation. The real concern lies with refined sugars and artificial sweeteners. These alternatives might not cause the same kind of blood sugar spikes you get from regular sugar, but that doesn’t mean they’re harmless.
As sugar-free products flood supermarket shelves, it’s time to cut through the marketing noise and get clear on what’s really inside these snacks. From decoding what ‘sugar-free’ actually means, to breaking down the most common sweeteners, and understanding why some ‘healthy’ foods might leave you bloated, we’re exploring it all with expert insights.
What does ‘sugar-free’ actually mean?
The term ‘sugar-free’ might sound straightforward, but the reality is a little more nuanced. “In the UK, a product can only be labelled ‘sugar-free’, if it contains less than 0.5g of sugars per 100g or 100ml,” says Nichola Ludlam-Raine, registered dietician and author of How Not to Eat Ultra-Processed. This includes both natural and added sugars.
“Just because it may tick this box, it does not always mean it’s healthier,” she adds. “The product may lack real fruit or contain sweeteners or processed ingredients that lack nutritional value.” So, while a product might claim to be ‘sugar-free’, it could still be highly processed or packed with other additives that don’t serve your wellbeing. Always remember that the label alone doesn’t guarantee a wholesome snack.
People often assume that all sugar is bad, but Ludlam-Raine points out a crucial difference: “It’s more about the type and quantity. Naturally occurring sugars (like those in fruit and dairy) aren’t the issue. Instead, it’s excessive free sugars (added sugars and syrups) that are linked to health risks."
Free sugars, which are added to foods or present in syrups, provide little nutritional benefit. In contrast, sugars naturally found in whole foods come bundled with fibre, vitamins, and minerals, which slow absorption and reduce blood sugar spikes.
How does excess sugar affect your body?
Sugar’s impact goes beyond high calories or tooth decay and Ludlam-Raine says there are some less obvious effects, like inflammation, disrupted hormone balance (especially insulin, impaired sleep, acne and premature skin ageing.
When consumed in excess over time, sugar can increase the risk of serious chronic conditions. “Excessive sugar intake can lead to weight gain and insulin resistance which are both key drivers of type 2 diabetes. Regular high sugar intake also stresses the body’s ability to regulate blood glucose,” says Ludlam-Raine. In other words, sugar overload can exhaust your body’s regulatory systems, leading to sustained high blood sugar and potentially diabetes.
What’s really inside sugar-free products?
‘Sugar-free’ doesn’t mean sweetener-free. Most sugar-free products still aim to taste sweet, which means they’re usually loaded with sugar substitutes. Common sweeteners include stevia, erythritol, sucralose and aspartame, most of which are considered safe in moderation by regulatory bodies, "but their effects can really vary,” says Ludlam-Raine. While these alternatives don’t raise blood sugar in the same way as standard sugar, they come with their own pros and cons, especially for digestion and gut health.
The impact of sweeteners on your gut health
If you’ve ever wondered why sugar-free snacks give you tummy trouble, Ludlam-Raine sheds light on the issue. Some, especially those that contain sugar alcohols like sorbitol or xylitol, can cause bloating, gas or even diarrhoea, while others may impact your gut microbiota. "This is often due to sugar alcohols or high-fibre bulking agents, which ferment in the gut and can trigger bloating or laxative effects for some," says Ludlam-Raine.
However, she notes that more research is definitely needed to better understand the effects.
The hidden ‘sugars’ worth watching out for
Sugar can hide under many guises, sometimes referred to as ‘natural’ or ‘healthier’ alternatives. “Watch for ingredients like glucose syrup, high fructose corn syrup, agave nectar and rice syrup as these are all forms of added sugar, even if marketed as natural,” says Ludlam-Raine.
Knowing these names can help you avoid accidentally loading up on hidden sugars, even when packaging claims otherwise. A simple check of the ingredients list before buying is all it takes.
What does a balanced, minimally processed snack look like?
If ‘sugar-free’ snacks leave you feeling bloated or unsatisfied, Ludlam-Raine suggests going back to basics. “Think apple slices with peanut butter, Greek yoghurt with berries, or oatcakes and carrot sticks with hummus," she says.
These snacks are all loaded with fibre, healthy fats and protein that keep you fuller for longer. They’re also minimally processed, nutrient-dense, and provide slow-release energy without artificial ingredients, helping you avoid those pesky blood sugar crashes and unwanted digestive issues.
Expert-approved top tips for smarter snacking choices
Ludlam-Raine shares some practical advice to help you shop a little smarter.
- Always read the ingredients list, not just the front of the pack but on the back.
- Aim for whole ingredients you recognise
- Limit foods with long lists of additives or hidden sugars.
Following these simple steps can be a pretty powerful tool to help you see past clever marketing and truly understand what you’re actually eating.
This article is for informational purposes only, even if and regardless of whether it features the advice of physicians and medical practitioners. This article is not, nor is it intended to be, a substitute for professional medical advice, diagnosis, or treatment and should never be relied upon for specific medical advice. The views expressed in this article are the views of the expert and do not necessarily represent the views of Healf
Samantha Nice is a seasoned wellness writer with over a decade of experience crafting content for a diverse range of global brands. A passionate advocate for holistic wellbeing, she brings a particular focus to supplements, women’s health, strength training, and running. Samantha is a proud member of the Healf editorial team, where she merges her love for storytelling with industry insights and science-backed evidence.
An avid WHOOP wearer, keen runner (with a sub 1:30 half marathon) hot yoga enthusiast and regular gym goer, Samantha lives and breathes the wellness lifestyle she writes about. With a solid black book of trusted contacts (including some of the industry’s leading experts) she’s committed to creating accessible, well-informed content that empowers and inspires Healf readers.
- 1. What does ‘sugar-free’ actually mean?
- 2. How does excess sugar affect your body?
- 3. What’s really inside sugar-free products?
- 4. The impact of sweeteners on your gut health
- 5. The hidden ‘sugars’ worth watching out for
- 6. What does a balanced, minimally processed snack look like?
- 7. Expert-approved top tips for smarter snacking choices
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