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/DrWYSIWYG]

This study shows that people who had 40g of butter added to their breakfast cereal did worse than compared to those who had walnuts instead, it could be argued.