The reason why exercise does things that diet alone cannot is likely AMPK activation. AMPK is the "garbage collection" for the body/mind.
I noticed that she is a lot sharper now. Previously, she would forget something in a conversation or ask twice. Now she is absolutely here and if we for example discuss some video, she mentions details that I overlooked.
That was quite a change.
https://rothschild.shinyapps.io/AMPK_dashboard/
Fun to play with.