Running and diet improvements did great things for my ADHD, but it's not consistent. I'd fall into slumps due to ADHD-fuelled depression, I think. The stimulants do a great job warding that off and keeping me consistent with exercise. Consistent exercise tends to keep me consistent with diet.

If anyone argued that stimulants are bad for my health, I could only point out that without them, my health suffers acutely through sheer neglect and it's a downward spiral.