I sort of just naturally intermittently fast most of the time without trying as mentioned above, & have looked into fasting extensively & highly rate it, what I now do intentionally at least once or twice a year is an extended juice fast (juice cleanse, aka vacation from solid food) which I would highly recommend everyone try at least once, especially anyone with health issues, chronic or otherwise, it will even clear up issues you didn't even know you had, serious game changer for me & many others I know. You just make 70/30 veg/fruit juices & drink whenever hungry, 2-3 litres daily & no solid food, bypassing your digestive system (something like 65% of our energy expelled daily is on digesting food) & allowing the abundance of nutrients to enter your bloodstream directly & your body to focus on healing rather than processing food. 30 days was my longest so far, & the craziest part is how long after ceasing to eat that you continue to expel solid waste (no eating, just juice, but still doing solid shits!), like 2 weeks! Even more for some on less clean diets! The western diet clogs us up bad, Elvis's colon weighed 30lbs upon autopsy, & it's said most western dieters carry around 20lbs+ of excess waste, it's even referred to in religious texts as the cesspool, the serpent & the fall of mankind etc. Never felt better than when on & right after a juice fast, so clear & clean with boundless energy etc. give it a go ya got nothing to lose, I'll link a doco for anyone interested, just check out the health conditions being healed! -