These videos by the channel "What I've Learned" are great:
- Fasting vs. Eating Less: What's the Difference? 
- Longevity & Why I now eat One Meal a Day 
The channel  also has many other videos on the topic of nutrition, with similar emphasis.
Also see the excellent and readable book "The Complete Guide to Fasting: Heal Your Body Through Intermittent, Alternate-Day, and Extended Fasting" by Dr Jason Fung and Jimmy Moore .