There are lots of ways to fast.
Don’t get bogged down in the weeds here.
Point is to do it.
Start with 24 hours.
REFERENCES
1 - https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4324360/
2 - https://pubmed.ncbi.nlm.nih.gov/6758355/
3 - https://pubmed.ncbi.nlm.nih.gov/1548337/
4 - https://www.eurekalert.org/news-releases/906514