Foods for concentration

Ability to concentrate is a benefit of a Healthy Diet

It may sound trite but it's true: If your diet lacks essential nutrients, it can hurt your ability to concentrate. 

Eating too much or too little can also interfere with your focus. 

A heavy meal may make you feel tired, while too few calories can result in distracting hunger pangs.

Benefit your brain: Strive for a well-balanced diet full of a wide variety of healthy foods.

Info source: http://www.webmd.com/add-adhd/slideshow-brain-foods-that-help-you-concentrate