Working memory is the process whereby your brain is able to temporarily store information in the moment and recall it when you need it. Poor working memory scores may suggest brain cell nutrient deficiencies, inflammation, insufficient neuronal connections, or poor quality sleep.

To efficiently sustain your attention and 'tune out' competing distractions, your brain must produce specific neurotransmitters. However, your brain requires adequate nutrients to create these neurotransmitters. 

Flexible attention is your capacity to rapidly adapt your thinking based on new information and not get stuck in compulsive behavior. Poor flexible attention scores may be due to a decreased production of the neurotransmitters serotonin and GABA.

Processing speed is the pace at which you take in information, make sense of it and begin to respond. It has nothing to do with how smart you are -- just how fast you can take in and use information. Slow processing speed may be due to nutrient deficiencies in brain cells, limited production of vital neurotransmitters, chronic stress, lack of quality sleep, and toxins in your diet (such as refined sugars and processed foods).