Why do we forget memories that were supposed to be enjoyable? Is there a limit to the brain's capacity?

A Bristol University anatomist says forgetting happy memories usually reflects how the brain filters, stores, and reconstructs information.

Memory loss is not mainly caused by a “full” brain, but by limits in attention, encoding, and recall.

The hippocampus and working memory help select what gets kept, while long-term memory is rebuilt each time it is remembered.

The takeaway: forgetting is often a normal part of how memory works, not proof of a fixed storage capacity.