Considering that for decades mainstream scientists said it was unhealthy and dont do it. There were not many studies done. But considering the explosion in interest in the last decade which is funny to me for some reason, some of the studies that have been done recently show it can definitely reverse the effects of pre diabetes and a few other things like cholesterol. I dont think there is any real studies done on the effects of metabolism.

But in my mind, if your not eating, your slowing down your metabolism. (they say this is bad.) but it seems to me that the slower your heart beats, and the slower your cells burn fuel, the less wear and tear your putting on your internals. There is a common theory that a heart only has so many beats. So seems to reason again that less beats means a longer life.

Would make sense why mainstream information would tell us that fasting and slow metabolism is "bad". They do not want us living past retirement age anyway. Once we can no longer work for the system, we are considered useless, disposable.

All I can say for sure is. I have been fasting for over two decades (like I said in another comment). And everytime I go to buy my weed from the store I get carded. One time years ago when I used to have money to drink liquor, I had an asian lady who was shocked I was old. She legit told me I must have really good genetics lol.

Half the time the people carding me will make a comment about my age and when I was still able to hold a full time job my coworkers would always express disbelief that I was old as I was. Is it the genetics or the fasting, or a little bit of both. I dont really know.