From a report by Duke University, exercise and diet may improve the range of cognitive function.
According to the report, "Physical activity does seem to have a direct effect on brain cells. There are neurochemical changes that happen with exercise. There is increased production of brain-derived neurotrophic factor, which stimulates connection with other brain cells, but also there is some evidence that it helps grow new brain cells."
"And the combination of good eating and exercise also produced the expected physical advances. Diet-and-exercise participants lost an average of 19 pounds and lowered systolic blood pressure by 16 points and diastolic pressure by 10 points by the end of the four-month program."