When people try to reduce sugar for blood sugar management or general health, they typically start with the obvious culprits — sweets, biscuits, fizzy drinks, cakes. These are easy to identify and easy to cut back on. The more challenging category is the foods that do not taste particularly sweet but contain surprisingly large amounts of added sugar — or rapidly digestible carbohydrates that behave like sugar in your body. Here are 15 everyday foods that are worth being aware of.
Why Hidden Sugars Matter
The NHS recommends that adults consume no more than 30g of free sugars per day — roughly seven teaspoons. Free sugars include all added sugars, as well as sugars naturally present in honey, syrups, fruit juices, and smoothies. Sugars naturally present in whole fruits, vegetables, and dairy do not count toward this total.
The problem is that many processed foods contain substantial amounts of free sugar in forms that are not obviously 'sugary' — either because they are disguised by other strong flavours (salt, fat, umami), or because they are listed under unfamiliar names on the ingredient label.
For anyone managing blood sugar — whether through prediabetes, type 2 diabetes, or general metabolic health — being aware of these sources is as important as avoiding obvious sweets.
15 Foods With Surprising Sugar Content
1. Fruit juice — even freshly squeezed. A 200ml glass of orange juice contains approximately 17g of sugar — nearly as much as a can of cola. Without the fibre of whole fruit, the sugar is absorbed almost instantly. Choose whole fruit instead.
2. Flavoured yoghurts. A standard 125g pot of flavoured low-fat yoghurt can contain 12 to 18g of sugar. Plain, unsweetened yoghurt is a far better choice — sweeten it yourself with a few berries if needed.
3. Granola. Often marketed as a healthy breakfast, many commercial granola products contain 20 to 30g of sugar per 100g, as well as a high GI from processed oats and honey coating. Check the label — or choose plain rolled oats instead.
4. Pasta sauces in jars. Tomato-based pasta sauces frequently contain 8 to 12g of added sugar per serving. Make your own with tinned tomatoes, garlic, and herbs — it takes 20 minutes and contains no added sugar.
5. Bread. Most commercial white and brown bread has a GI above 70 and contains maltose (a form of sugar) added during processing. Sourdough and traditional rye bread are lower-GI alternatives.
6. Breakfast cereals, including 'healthy' ones. Even cereals marketed as low-fat or high-fibre — such as bran flakes, muesli clusters, and certain granola bars — can contain 20 to 30g of sugar per 100g. Always check 'of which sugars' on the nutrition label.
7. Flavoured oat drinks and oat milk. While plain oat milk contains relatively modest sugar, flavoured barista versions can contain 8 to 10g per 250ml serving. Oat milk also has a higher GI than dairy milk due to enzymatic processing of the oat starch.
8. Protein bars. The nutrition profile of protein bars varies enormously. Many contain 20 to 30g of sugar per bar alongside their protein content. Read the label — a bar with 20g protein and 25g sugar is not the health food it appears to be.
9. Smoothies and cold-pressed juices. Bottled smoothies, even when made from whole fruits, can contain 40 to 50g of sugar per bottle. The blending process partially breaks down fibre, raising the GI considerably.
10. Ketchup and barbecue sauce. Tomato ketchup contains roughly 4g of sugar per tablespoon, and barbecue sauce can contain up to 8g. Easy to underestimate when used generously.
11. Baked beans. A standard 200g serving of tinned baked beans contains around 9g of sugar. They are also a reasonable source of protein and fibre, but worth factoring in if you are monitoring sugar intake carefully.
12. Ready meals and soups. Many shop-bought soups and ready meals use sugar as a flavour enhancer and preservative. A typical supermarket tomato soup can contain 10 to 15g of sugar per serving.
13. Coleslaw from delis and supermarkets. Commercial coleslaw typically contains substantial amounts of sugar syrup or sweetened mayonnaise — often 8 to 12g per serving.
14. Peanut butter — some brands. Many mainstream peanut butters add sugar and palm oil. Choose products with one ingredient: peanuts.
15. Rice cakes. Often assumed to be a light, low-sugar snack, plain rice cakes actually have a very high GI (around 82) — similar to white bread — because they are made from highly processed puffed rice.
How to Read Food Labels for Sugar
In the UK, nutrition labels must show total carbohydrate and 'of which sugars' per 100g. As a guide, more than 22.5g of sugars per 100g is considered high; 5g or less per 100g is considered low.
Also scan the ingredients list. Sugars appear under many names: sucrose, glucose, fructose, dextrose, maltose, lactose, corn syrup, rice syrup, cane juice, molasses, and invert sugar are all forms of added sugar. The higher up the ingredients list any of these appear, the more sugar the product contains.
Key Takeaways
Reducing hidden sugars does not require a drastic overhaul of your diet overnight. Start by identifying one or two items from this list that are regular features of your diet, check the label, and try an alternative for two to three weeks. Small, consistent swaps accumulate into significant reductions in daily sugar intake and meaningful improvements in blood glucose control over time.
