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That's quite interesting - I'd heard of the 5:2 and my partner has been doing it for some time, though lately she's been shifting towards effectively a very time restricted window as she'll less strict about dinner but will only have a banana and couple of rice cakes during the day.
I actually unknowingly did time restricted fasting for probably a good year pre pandemic as I would have breakfast at work (9:30 start) so easily fast for 12/14 hours from dinner, and ride into work before breakfast - only a 10km ride but I'd try and keep it as decent an effort as traffic would allow. So not as small a window and by no mean strict/planned, but in that period I definitely shifted fat and got leaner.
This has gone backwards a bit through lockdown despite increased mileage which has tempted me to try and include some pre breakfast laps into my weekly routine, though I've also been feeling my usual low blood pressure/sugar levels a lot as I do seem to get light headed pretty often when I stand up in the couple hours after a ride...!
There are lots of variations but mainly eating in a time restricted window. So all your food in an 8 hour period for example. Tea finished by 7pm means no breakfast until 11am the next morning. Thread here: https://www.lfgss.com/conversations/357777/