Caster sugar

Caster sugar is a fine-grained white sugar, typically made from refined sugar beet or sugar cane. The sugar crystals are smaller than granulated sugar but larger than icing sugar, giving it a lighter texture. It dissolves more easily than granulated sugar, making it ideal for baking.

Manufacturers use caster sugar primarily as a sweetener in baked goods. Its fine texture allows it to cream easily with butter, creating a lighter texture in cakes and biscuits. It is also used in meringues, sponges, and other desserts where a smooth consistency is desired.

Caster sugar is a source of energy and contributes to free sugars in the diet. The UK government's Scientific Advisory Committee on Nutrition (SACN) recommends that free sugars should not exceed 5% of total dietary energy. Caster sugar is not considered a food additive and therefore does not have an E-number or require authorisation on the Register of Food Additive Authorisations. Excessive consumption of free sugars is associated with an increased risk of dental caries and weight gain.