Well, if you go to search about IF and Ketogenic Diet, they all said that these offers you that. This was the reason I started doing IF.being calm, focused, have strong body.. good energy,motivated.is more important i think.
And those are the reasons why I am writing on this forum now :pstress hormones dulls mind,disturb feelings.and damages body, i dont know how it can increase life span, but with high stress hormones for sure your body cant perform very well,joints become weak and sore,skin quality drops, reproductive system get damaged.everything get damage.