E220 (sulfur dioxide)

E220 is sulfur dioxide. In food technology, this additive is primarily considered a preservative: its task is to slow down spoilage, control the growth of undesirable microorganisms, or maintain product stability during storage.

What this additive is

By nature, E220 is a sulfite preservative and antioxidant. For accuracy, it is important not to confuse it with neighboring E-codes: close numbers often denote salts of the same acid or substances of the same group, but this is not always the same.

Preservatives do not make the product “eternal” and do not fix poor raw materials. They only work within a specific technology: at the required acidity, humidity, temperature, dosage, and sanitary quality of production.

Why it is used

The main mechanism of action: protects against microbial spoilage, darkening, and oxidation. That is why E220 is used not for taste or nutritional value, but for shelf life, safety, and predictable product quality.

In practice, E220 can be found in products such as wine, dried fruits, juices, potato products, marinades, and some semi-finished products. Specific permitted categories and levels depend on the legislation of the country and the type of product.

Nutrition and metabolism

In normal technological doses, preservatives are rarely a significant source of calories, proteins, fats, or carbohydrates. For blood glucose and insulin, the product itself is often more important: sugar, starch, flour, syrups, alcohol, salt, fats, and portion size.

However, frequent consumption of products with preservatives may be a marker of an ultra-processed diet. Therefore, the question is not only about one E-number but about the overall structure of the diet: how many whole foods, proteins, fibers, minerals, and proper foods are in the diet.

Safety and limitations

Sulfites can cause reactions in sensitive individuals, especially among some people with asthma; labeling of sulfites is important for such consumers.

Individual tolerance varies. Sensitive individuals may have reactions to specific groups of preservatives, especially sulfites, benzoates, or nitrite-nitrate products; in case of repeated reactions, it is advisable to compare symptoms with the label and discuss it with a specialist.

How to read the label

On the label, E220 may be indicated as an E number or as a name: sulfur dioxide. It is better to evaluate it together with the function of the additive, the product category, frequency of consumption, shelf life, and the complete composition, rather than drawing conclusions solely based on the presence of the E-code.