Good links to reasons for fasting beside weight loss. Dr Mark Mattson's own TedX talk on Why Fasting Bolsters Brain Power from back in 2014, inspired some of the revival in fasting, e.g. Silicon Valley fasting groups. It has had 2.6 million views; he covers NIH research on Alzheimer’s and Parkinson’s too.

https://youtu.be/4UkZAwKoCP8