Mental Focus & Cognition
Focus and cognitive performance are the most audience-relevant topic on this site for anyone doing knowledge work — what actually moves attention and working memory, and what’s just a caffeine effect wearing a nootropic label. This is the evidence behind "food for concentration," minus the hype.

Nutrition Science for Creatives: What Actually Helps You Focus During Deep Work
Freelancers and knowledge workers get worse nutrition advice than athletes do. Here's what the cognition research actually supports for a working day, not a training block.
Meta-analysis

Do Nootropics Actually Work?
Some compounds marketed as nootropics have real trial support. Most of the 'stack' culture around them doesn't. Here's the difference.
Meta-analysis

Best Foods and Drinks for Focus
Most 'brain food' content is aesthetic. This is the actual evidence on caffeine, glucose, and attention.
Meta-analysis