I'd say that I started 5:2 on Sunday, but I didn't do anything then but read about it. Yesterday was my first fast day. I felt generally okay. A bit lethargic late in the afternoon, but not so different from any other day at that time. I also felt a bit wide-awake and nervous when it was time to go to sleep; took me a while to drift off.
I'm 59, male, and need to lose at least 50 pounds. I need to lose more than that if I believe the charts and tables, but I'm not going to agonize about that now. Over the years I've done a lot of strength training and I carry a lot of muscle for a man my age, and my legs are short (30" inseam) for my height (6'1"), all of which throws the tables off. I get a fair amount of exercise, aerobic and resistance. Despite being fat, my blood pressure and blood glucose remained normal, until the last year or so. BG is still okay, at about 93 fasting, but BP has started to climb. So I'm on a diuretic med now.
I've been overweight for most of my adult life, although I've fought the good fight and had intervals of success lasting a few years at a time. I was a True Believer in lowcarb/paleo but found it very difficult to comply with over the long haul. This was mainly because of the "rejectionist" mindset that must be sustained. My life became all about what I don't eat, and I just couldn't keep that going. I hope I'll have better luck with the when I don't eat approach.
I've read about IF for years, and tried the "Fast Five" approach once or twice. I was too prone to binge during the "eating window". I hope the 5:2 approach is more manageable.
That's about it. My fast foods were containers of Panera low-fat chicken tortilla soup. I didn't choose them because they were low-fat; only because they were 260 calories per container. I made up the remaining 80 calories at dinner with an Edy's frozen fruit bar.
Nice to meet everybody!