Just a few notes:

Fasting (1 to n weeks) is said to provide potential benefits for certain types of cancer treatments. Pre-cancer, it is said to potentially prevent cancer onset. This is potentially powerful for those of us with a family history with cancer.

I have been fasting for a couple of years. My longest fast was 21 days last year. I am on track for a four week fast right now.

Note that there seems to be research indicating that prolonged fasting with cancer might not be good, fasting around treatment is a different story.

https://www.youtube.com/shorts/EGUtr9w_HtE

https://www.youtube.com/watch?v=jDG1m_b5Ih0

Sunlight exposure is also said to be critical with treatment of disease. It isn't just about vitamin D.

Here's a Huberman episode with Dr. Roger Seheult on the subject:

https://www.youtube.com/watch?v=N5DAW8mkJ6Y