Daily Junction.mobi portalFood · January 6, 2025 · Dr. Nadia Okoro · 6 min
A plain-English guide to food additives and E-numbers: what they are, the main types, how they are tested for safety, and how to read them on a label.
Turn over almost any packaged food and you will find a list that mixes the familiar with the cryptic: sugar, salt, then "E330", "emulsifier (E322)", "preservative". For a lot of people those codes trigger a vague unease — a sense that the food has been tampered with. In reality an E-number is closer to a stamp of approval than a red flag. It tells you that a substance has been assessed by regulators and permitted for use. Understanding what additives do, and how they are checked, takes most of the mystery out of the ingredients list.
This article is general information, not medical or dietary advice. If you have a food allergy or intolerance, check labels carefully and speak to a healthcare professional.
A food additive is any substance added to food on purpose to do a particular job — to keep it safe for longer, stop it separating, give it colour, sweeten it, or improve its texture. Additives are not a modern invention: salting meat, smoking fish and pickling vegetables are all forms of food preservation that are thousands of years old. What has changed is that today's additives are identified, purified and regulated.
An E-number is simply a code given to an additive that has been evaluated and approved for use in the European Union, a system that Great Britain has retained. The "E" stands for Europe. So E300 is ascorbic acid — ordinary vitamin C, used as an antioxidant — and E160a is beta-carotene, the orange pigment found in carrots, used as a colour. The number and the chemical name describe the same thing; the code is just shorthand for the label.
Additives are grouped by the job they do. The main categories are:
| Job | What it does | Common example |
|---|---|---|
| Preservative | Slows spoilage and growth of microbes | Sulphur dioxide (E220) |
| Antioxidant | Stops fats going rancid, limits browning | Ascorbic acid / vitamin C (E300) |
| Colour | Adds or restores colour | Beta-carotene (E160a) |
| Sweetener | Sweetness with few calories | Aspartame (E951) |
| Emulsifier | Keeps oil and water mixed | Lecithin (E322) |
| Flavour enhancer | Boosts existing flavour | Monosodium glutamate (E621) |
This is the part that reassures most people once they understand it. An additive cannot legally be used in food unless it has been assessed as safe. In the EU that assessment is done by the European Food Safety Authority (EFSA); in the UK the Food Standards Agency and its independent expert committees take that role.
Scientists review the evidence on a substance and, where possible, set an Acceptable Daily Intake (ADI) — the amount a person could consume every day across their whole life with no appreciable risk. Crucially, the ADI is set with a large safety margin, typically a hundred times lower than the highest dose shown to cause no effect in testing. Approvals are also kept under review: EFSA has re-evaluated additives that were authorised decades ago, and some have had their permitted uses tightened as a result.
An E-number is not a sign that something has been sneaked into your food. It is a sign that the substance has been named, assessed and limited by regulators.
This evidence-led approach is the same principle that runs through nutrition more broadly, where claims have to be weighed against the strength of the proof — something we look at in our guide to what a balanced diet really means.
Saying additives are regulated is not the same as saying every one is beyond question. A well-known example is a group of six food colours — sometimes called the "Southampton colours" after the study that prompted action — which UK and EU rules require to be labelled with the statement that they "may have an adverse effect on activity and attention in children". The colours remain legal, but the warning allows parents to avoid them if they choose, and many manufacturers have reformulated to drop them.
Other additives are restricted to particular foods or maximum levels. Some sweeteners are not recommended in large amounts for young children. None of this undermines the system — if anything it shows it working, by attaching conditions where evidence suggests caution.
You do not need to memorise hundreds of codes. A few habits help:
If you want to cut down on heavily processed foods, the simplest route is not to hunt for E-numbers but to cook more from scratch, which also helps with reducing food waste and gives you control over salt and sugar. Planning meals around whole ingredients, as we cover in meal planning on a budget, naturally reduces the number of additives you eat without any label-reading at all.
One last myth is worth puncturing. People often assume "natural" additives are safe and "chemical" ones are not. But everything is made of chemicals, including water and vitamin C. Some perfectly safe additives have intimidating names, while some natural substances are toxic. The source of an additive does not decide whether it is safe — the evidence on that specific substance, and the amount you consume, do. Vitamin C is no less an antioxidant when it is written as E300.
Food additives do real jobs: keeping food safe, stable, palatable and affordable. An E-number means the additive has been assessed and approved by bodies such as EFSA and the UK Food Standards Agency, with an Acceptable Daily Intake set well below any level of concern. A handful carry warnings, which is the system doing its job rather than failing. If you want to eat fewer additives, the most effective step is to cook more whole foods — not to fear a code on a label.
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