The Eurasian blackcap has a versatile diet that varies with the seasons. In spring and summer, it primarily consumes insects and small invertebrates, which are crucial for feeding its chicks. As autumn approaches, the blackcap shifts to eating fruits and berries to build up fat reserves for migration. During winter, in its overwintering areas, the diet remains focused on fruits and berries, and the bird often supplements this by visiting bird feeders in urban and suburban regions. This dietary flexibility enables the blackcap to thrive in diverse habitats and throughout different seasons.