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I'm a weird blend in that I want some things to be routine but I'm also just as likely to go "ooh, look a party in Brussels, wanna go?" Often the same thing happens with my riding. I might have a long work day so ditch a session and then need to make it up the next day or whatever. Pretty sure I'd just end up skipping the two fast days. I've thought about it before but it never really looked like it would work with big weekends on the bike, two gym days and two turbo days most weeks plus somewhat random work hours. If I fast on recovery days then I don't recover properly and the next session is normally shit. The eating window variant gets some benefits of fasting without the stress of find a whole day restricted.
Let's see how this goes and then maybe I'll give 5:2 a try later. Oh, I'll be doing less ultra racing this year - that has another big impact on diet - ie. you can't be on one.
hippy-
I know what you mean. I would say it's easier to stick to than you think though. The knowledge that it's only one day, and the promise of food tomorrow gets you through it. And fasting days are free to shuffle around to whenever suits.
I've only ended up on a diet after injury has stopped me running, which in turn caused weight gain. I'm hoping to have the all clear to run again before the end of the year, and I'm really interested to see if 5:2 fits in with running. Either way, I'm in much better shape than usual after a long lay off. But I'm also now planning to keep my running distances down, too much too soon is what wrecked me in the first place! (You can keep your ultras thank you very much!)
Nef
I'd say 5:2 is the most sustainable thing I've tried - it feels like a permanent change. Really easy to schedule, even on awkward weeks where I end up doing my 500kcal days in a row (I could avoid this if I really wanted but for me, fasting 2 days in a row is better than giving up any day fri-sun). I still manage to train on fasting days, albeit in a slightly different manner.
I'd give it a punt. It helps create a calorific deficit over the week, but removes the pressure of being on a diet 7 days a week. Also, I find it easier to say no to crap food the days after fasting - don't want to waste the hungry days!