Should I have fasting? What is the benefit to my body?

Reference:

https://www.youtube.com/watch?v=A6Dkt7zyImk

https://www.youtube.com/watch?v=eEEs9Z1mumc

https://www.youtube.com/watch?v=xrZMYVDcjZI

https://www.youtube.com/watch?v=gl8k2ncIQMc

https://www.youtube.com/watch?v=6UhrXTpgkeo

https://www.youtube.com/watch?v=gXC6LHkUPnE&t=301s