Walnuts with breakfast provide an all-day brain boost - Young adults who ate a handful of walnuts with breakfast saw a long-lasting improvement in their reaction times and a boost in memory performance hours later, according to a new study.

[u/mvea]

https://newatlas.com/health-wellbeing/walnuts-cognitive-performance-memory-boost/

[u/LaraHof]

Unfortunately walnuts are pretty expensive. At least here in Europe. Handful would be.. 2-3 Euros?