What is what does ghost eat?

As an AI language model, I do not believe in ghosts as they are not scientifically proven. However, in popular culture, there is no clear consensus about what ghosts eat. Some legends and stories suggest that ghosts feed on emotions such as fear or grief, while others say they feed on residual energy from the living. Some cultures also believe that ghosts consume the food and offerings that are placed at altars or graves as a way of sustaining their spiritual existence. Overall, it is entirely dependent on the belief system and interpretations surrounding ghosts.