Sucralose

Sucralose (E955) is a no-calorie artificial sweetener about 600 times sweeter than sugar. It is made from sucrose by replacing three hydroxyl groups with chlorine atoms, a change the body cannot break down for energy, so it passes through largely unabsorbed. It is the sweetener in Splenda and appears on UK labels as 'sucralose' or 'E955'.

It is calorie-free and does not cause tooth decay, which is why it replaced sugar in thousands of products, but the science has moved. A 2025 randomised controlled trial found 30 days of sucralose reduced insulin sensitivity by around 20% in healthy adults, and human studies consistently show it shifts the balance of gut bacteria. It is still approved in the UK and EU, but 'no calories' and 'no consequences' are different claims, and the gap matters most for people using it every day rather than occasionally.

On its own it has little immediate effect on blood glucose, which is the basis for its use in diabetic and low-sugar products. The newer concern is the chronic picture rather than the acute spike: a 2025 trial linked 30 days of daily sucralose to reduced insulin sensitivity and higher fasting glucose, and some research suggests it blunts the body's glucose handling when taken with carbohydrate. So it does not spike blood sugar the way sugar does, but regular use may affect how your body manages glucose over time.

It is approved for use in the UK and EU and has been in the food supply for over 25 years. That approval covers acute safety, not every open question: EFSA declined in 2026 to extend its approval to high-heat baking, and recent human trials on insulin sensitivity and gut bacteria are not yet reflected in the regulatory position. Approved is not the same as settled.

Yes. Sucralose is not a FODMAP and is permitted on the low-FODMAP diet used to manage IBS. Watch the rest of the label though: it often sits alongside polyol sweeteners such as sorbitol or maltitol, which are high-FODMAP, so check the full ingredient list if you are following the diet strictly.

Yes. Sucralose is an artificial, high-intensity sweetener made by chemically modifying sugar. It is not a natural sweetener like stevia, and it is not a sugar itself, despite being derived from one.

No. Sucralose is approved for use in the UK under the retained version of EU food additive legislation. It appears on the UK FSA approved-additives list. EFSA's 2026 re-evaluation confirmed current EU uses are authorised, though it declined to approve an extension into high-heat baking applications. The UK's authorisation rests on the pre-Brexit baseline; the FSA has not separately adopted the 2026 EFSA opinion.

Emerging human trial evidence suggests it can. A 2025 randomised controlled trial found that 30 days of sucralose consumption in healthy adults reduced insulin sensitivity by around 20% and raised fasting insulin and glucose compared with placebo. The mechanism is not fully established, but gut sweet-receptor activation influencing incretin hormones is the leading hypothesis.

Diet soft drinks, sugar-free squash, flavoured water, reduced-sugar yogurts, protein bars and shakes, chewing gum, sugar-free jams and sauces, and some lower-sugar baked goods. The table-top sweetener Splenda is primarily sucralose. Check the label for 'sucralose' or 'E955'.

Yes. Sucralose is synthesised from sucrose (sugar) via a chemical process and contains no animal-derived ingredients. It is suitable for vegans and vegetarians.