[ripper1138]

One difference is that eating is such a normal and low effort activity for us that there is no point for the brain to remember it. But if you were surviving in the wild, I bet you’d have much better memory of meals since they would all be somewhat ‘special’ in the sense that you are still alive!

[hyperpallium2]

If you had to every meal, and were seriously hungry, and every hunt was different, I think you'd remember many of them as well as your favourite book/movie/tv episode, insight, bug solved, life-event.

Routine is what kills memory.

[progre]

The brain is just not storing redundant copies of events that has the same neural hash.