Following a request from the European Commission, the Panel on Dietetic Products, Nutrition and Allergies was asked to provide a scientific opinion on a list of health claims pursuant to Article 13 of Regulation (EC) No 1924/2006. This opinion addresses the scientific substantiation of health claims in relation to glycaemic carbohydrates and maintenance of normal brain function. The scientific substantiation is based on the information provided by the Member States in the consolidated list of Article 13 health claims and references that EFSA has received from Member States or directly from stakeholders. The food constituent that is the subject of the health claim is glycaemic carbohydrates. The Panel considers that glycaemic carbohydrates are sufficiently characterised in relation to the claimed effect. The claimed effects are “mental performance” and “cognitive/mental performance; alertness; attention; memory”. The target population is assumed to be the general population. In the context of the proposed wordings, the Panel assumes that the claimed effects refer to the maintenance of normal brain function. The Panel considers that maintenance of normal brain function is a beneficial physiological effect. Glucose is the preferred energy source for most body cells. The brain requires glucose for its energy needs. The Panel concludes that a cause and effect relationship has been established between the consumption of glycaemic carbohydrates and maintenance of normal brain function. A daily intake of 130 g of glycaemic carbohydrates has been estimated to cover the glucose requirement of the brain. Such amounts can be consumed as part of a balanced diet. The target population is the general population.