I don't think chemical imbalances can be changed by food alone though that would be nice.
That has been my experience with depression and anxiety, but I have found that supplementing certain nutrients and amino acids has helped. I see food and the supplements as my medicine. Maybe I will always be on 5-HTP to help manage my depression because, for whatever reason, my body won't produce/absorb enough serotonin, but I would rather be on that than Prozac or something with side effects.
Current interests - Starting Strength (reading it very slowly)