Hidden Sugars in Everyday Foods and How They Affect Digestion
Written by Mackayla Brennan
Content Writer and Nutrition Student – Hercules Supplements
Mackayla Brennan is a health and nutrition content writer at Hercules Supplements. She focuses on creating evidence-based content on digestion, gut health and nutrition, helping everyday Australians translate complex research into practical dietary advice.
When most people think of sugar, foods like soft drink, candy, and desserts usually come to mind. However, many everyday foods contain hidden sugars that can quickly increase your daily intake without you realising it.
Products like flavoured yogurts, protein bars, granola, premade soups, and condiments often contain added sugars to improve taste and the shelf life. While these foods may appear healthy or often advertise as being healthy, the sugar content can sometimes rival that of desserts.
Understanding where hidden sugars appear in everyday foods is an important step toward supporting digestion, protecting gut health, and improving overall wellbeing.
Everyday Foods That Contain Hidden Sugars
Many processed foods marketed as “healthy” can contain unexpected amounts of added sugar. Identifying these foods can help reduce overall sugar intake and support better digestive health.
Flavoured Yoghurt
Yogurt can be an excellent source of probiotics that support gut health. However, some flavoured yogurts contain high levels of added sugars, including fructose and syrups. In some cases, a single serving may contain up to 20 grams of sugar, which is similar to many dessert products. Choosing plain or Greek yogurt instead can significantly reduce sugar intake while still providing beneficial probiotics.
Protein Bars
Protein bars are another common source of hidden sugars. While they are often marketed as convenient and healthy snacks, some varieties contain as much sugar as a chocolate bar. Manufacturers frequently add syrups or sweeteners to improve taste and texture. When selecting a protein bar, it is helpful to compare nutrition labels and choose options with lower added sugar and higher fibre.
Condiments and Sauces
Even condiments can contain surprising amounts of added sugar. Ketchup, barbecue sauce and many salad dressings may not taste overly sweet, but their ingredient lists often include added sugars under different names, such as sugar or glucose syrup. For example, some barbecue sauces list both sugar and glucose syrup in the ingredients list. Because condiments are used regularly, even small servings can quietly add to your overall sugar intake.
Why Hidden Sugars Can Affect Your Gut Health
Sugar does not only contribute to conditions such as obesity, diabetes, and heart disease. Diets high in added sugar may also negatively affect gut health. High sugar intake can disrupt the balance of bacteria within the gut microbiome. Research suggests excessive sugar consumption may encourage the growth of harmful bacteria and fungi while reducing beneficial bacteria.
This imbalance, known as dysbiosis, has been associated with:
- inflammation
- allergies
- inflammatory bowel disease
- obesity
- diabetes
- certain cancers
By reducing hidden sugars in your diet, you are not only lowering empty calorie intake but also supporting a healthier gut microbiome. The gut microbiome plays an important role in digestion, immune function, and energy levels. Many people also support digestive health by focusing on fibre-rich foods and probiotics that help maintain a balanced gut environment.
How to Spot Hidden Sugars on Nutrition Labels
One of the most effective ways to reduce hidden sugar intake is learning how to read nutrition labels carefully. When comparing packaged foods, look for options with:
- Lower added sugar
- Lower saturated fat
- Lower energy (kilojoules)
- Lower sodium
- Higher fibre
It is also important to check the serving size, since sugar values are often listed per serving. For example, a small tub of flavoured yogurt may contain 20 grams of sugar, while plain Greek yogurt may contain only around 5 grams of naturally occurring lactose. Making small swaps like this can significantly reduce daily sugar intake.
Common Names for Hidden Sugar on Food Labels
Sugar can appear under different names in ingredient lists. On Australian food labels, added sugars are usually identified in the ingredients list, while the Nutrition Information Panel shows total sugars. Common names include dextrose, fructose, glucose, sucrose, malt, maltose, honey, golden syrup, maple syrup, brown sugar, caster sugar, and raw sugar. If these ingredients appear near the top of the ingredients list, the product is likely higher in added sugar.
Lower-Sugar vs Higher-Sugar Food Examples
Many everyday foods vary significantly in sugar content. Comparing labels between similar products can help you choose lower-sugar alternatives.
|
Food
|
Typical Sugar Content
|
|
Flavoured yoghurt
|
Up to 20g per serving
|
|
Plain Greek yoghurt
|
Around 5g (natural lactose)
|
|
Protein bars
|
10–25g depending on brand
|
|
BBQ sauce
|
6–12g per serving
|
|
Ketchup
|
Around 4g per tablespoon
|
|
Granola
|
10–15g per serving
|
Reading labels and comparing products can help identify lower sugar choices that support better digestion and overall health.
Bottom Line
Hidden sugars are present in many everyday foods, including snacks, sauces, and products marketed as healthy. By learning how to read nutrition labels and choosing foods that are lower in added sugar, sodium, and saturated fat — and higher in fibre — you can reduce unnecessary sugar intake while supporting digestion and long-term health. Small dietary changes can make a significant difference, and simply becoming aware of hidden sugars is an important first step toward healthier eating habits.
Frequently Asked Questions
What foods contain hidden sugars?
Many processed foods contain hidden sugars, including flavoured yogurt, protein bars, granola, sauces, salad dressings, and packaged snacks. Even foods marketed as healthy may contain added sugars to improve flavour and shelf life.
How can you identify hidden sugars on food labels?
Hidden sugars often appear under different names in ingredient lists, including fructose, dextrose, maltose, corn syrup, and cane sugar. Checking both the ingredient list and the total sugar per serving can help identify products with added sugar.
Does sugar affect gut health?
Diets high in added sugar may disrupt the balance of bacteria in the gut microbiome. This imbalance can reduce beneficial bacteria and may contribute to digestive issues and inflammation.
How much added sugar is recommended per day?
The World Health Organization recommends limiting added sugar intake to less than 10% of total daily energy intake, with additional benefits if reduced to below 5%.
Related Articles
https://www.herculessupplements.com.au/blogs/education/7-gut-health-supplements-to-consider
References
Diabetes Australia. (n.d.). Reading food labels.
https://www.diabetesaustralia.com.au/living-with-diabetes/food-labels/
Rooks, M. G., & Garrett, W. S. (2016). Gut microbiota, metabolites and host immunity. Nature Reviews Immunology, 16(6), 341–352.
https://doi.org/10.1038/nri.2016.42
West, H. (2020, June 26). 17 Foods and Drinks That Are Surprisingly High in Sugar. Healthline.
https://www.healthline.com/nutrition/18-surprising-foods-high-in-sugar
Yoganathan, P. (2024, November 29). Sugar’s link to poor gut health. Centre for Gastrointestinal Health.
https://centreforgastrointestinalhealth.com.au/the-impact-of-sugar-on-gut-health/
World Health Organization. (2015). Guideline: Sugars intake for adults and children. World Health Organization.
https://www.who.int/publications/i/item/9789241549028
Disclaimer: This article is for informational purposes only and does not replace professional medical or dietary advice.
