Hi
@jb42 - did you by any chance get on to IF from Jason Fung?
It's hard work to get into, and you need a plan, but I totally agree that a 36 hour fast is kind of the sweet spot for most impact and least risk.. I found, and still find it to be really the biggest lever I can pull. I'm only half a year into it, so cannot say that it's for life, but I'd like to think I'll have a place for it for ever.
For a couple of months, I was essentially eating (as normally as I could, but low carb high fat) every other day, so 36 hours before breaking fast.
For me, it was all about getting my liver truly empty on a regular basis, and I saw the period as being necessary, but unsustainable (by design) - what it did do though, was get me through the undeniable "hungry" phase, so that now I find that I typically fast for a full day every fortnight or so, kind of when it suits (it's a brilliant way of dealing with any single day, "how can I plan what to eat in this situation?" - "oh, I'll just make it a fasting day, easy") without ever feeling hungry, and in fact I look forward to those days, because I feel
best.