High insulin tells the body to store what you just ate as fat, thereby dropping your blood sugar concentration. Your brain can burn only sugar, so it is deprived of food. Poor concentration and depression can result. Also, the low blood sugar make you hungry, which causes you to eat more sugar or carbohydrates, and the cycle is repeated. Finally, insulin levels affect serotonin levels and many systems throughout the body.
Poor nutrition can result in lower levels of chemicals like serotonin.
ADDers, as a group, seems to be more sensitive in general and may therefore be more sensitive to the effects of modern lifestyles. Some people, for example, may be born with inherently lower serotonin levels, which causes the neuroreceptors to become more sensitive. This in turns may result in higher highs and lower lows, and an increased vulnerability to depression and other related syndromes. The same may be true of dopamine, insulin and other chemicals. Make lifestyles changes to decrease stress Try meditation or Yoga Try stress reduction courses.