Definitely doable and very common in many old cultures, have a look at the film "The science of fasting" (original German), might be eye opening: https://youtu.be/WgLJ_dfKy1E

> Video unavailable. This video contains content from LDS, who has blocked it in your country on copyright grounds

I hope LDS burns in hell, whoever they are.

Latter Day Saints??? The Mormons? (I get the copyright block message here in the USA)

I looked it up, and it's "content management company" Little Dot Studios, who seem to make money by claiming things on youtube to steal ad money and extort people.

Ugh. I hope the Mormons hit them with a trademark violation!

Same here. Guess they don’t like Ecuador.

Apparently the only whitelisted regions are DE and FR, so they don't like the majority of the people.

Why would you do this to yourself?

Last week I fasted for 5 days. Today I ate sugar again. I cannot speak for OP but my primary reasons were curiosity and becoming more aware of my body and energy levels. The last days I was super active, productive and in a crazy good mood. Today I feel like a slump. I probably will do it again and 5 days was much easier than expected. You probably need some experience to do it for 12 days, but I am very confident that it is manageable after the second or third time. It‘s like sport. People say „why would you do it“, but when you experience it by yourself you know intrinsically that it isn’t actually that bad.

Is it discipline? Or a medical condition? For example, I wouldn’t say someone with anorexia has impressive discipline. I can’t think of any reason rooted in reality why someone would fast for almost 2 weeks straight.