What you eat plays a vital role in the brain’s functioning. And, our mental health is created or influenced by the way the brain functions. What the brain gets as input (in this case, food) influences our mental health or mood. The consumption of excess fatty food reduces the production of neuron transmitters; excess sugar leads to depression and weakening of muscles, junk foods lead to stress and tension. Transfat and saturated fat lead to low energy levels and low refreshments. Ideal foods include fruits, whole grains, protein, etc.
What we eat influences our mood. The psychologist analyses the subject's lifestyle, understands the drawbacks in their current diet and corrects it by providing ideal food for the brain -- a scientific approach. The diet recommended by the psychologist is decided considering the subject’s age and health.