I highly recommend looking into the work of Dr. Rhonda Patrick, Ph.D. She has extensive material explaining the science behind IF, and many other topics relating to bio pathways and aging.
Jesting aside. She is cool, talks very fast and deliver an awful lot of information in a short time.
Though I do agree - her podcasts can sometimes be a bit of an information overload for those who aren't biomed folk. However in my opinion, her youtube channel[1] is significantly easier to follow as there are often animations and more lengthly explanations.
Also provided a DNA health check if you want to link your 23andMe account.