My wife can't do it. She gets too bad of headaches, however she is naturally thin and eats much smaller portions than me, so probably doesn't need it.

Probably lost 10lbs in first month, and then gradually lost rest over 6-8 month period. Stabilized at current weight (155) for last 2 years.

My first foray into IF was doing 18-6 (18 hr fast, 6 eating window), however didn't really see much results.....however moving to 22-2 (I really probably do 21.5-2.5) was a big change.