I have been struggling to improve mental focus enough to, for instance, read scientific articles or make salad dressing. Recently I found that iron deficiency might play a role in my poor cognition, and I was able to study for an hour or two each day--until I went from a lowish carbohydrate diet (fruit smoothie for breakfast, tacos and salad for lunch, salad with beans or meat for dinner) to a low carbohydrate diet (replacing the morning smoothie with eggs, salsa, spinach and beans). Has anyone else experienced problems concentrating on a fairly low carbohydrate diet? Is this just part of our mitochondrial issues? Thanks!