Originally Posted by Steven Low
Nope, but you can take my word for it if you want.
Considering the fact that lowered metabolism is obviously a side effect of IF (similar to caloric restriction; and there are studies at least on mice that show IF and CR have similar effects)... otherwise there's probably a few studies out there that show it somewhere (maybe on this forum.. haven't read all the threads in here).
Funny how some people like Lyle say that short term fasting BOOST the metabolism (and I have yet to find a study that backs it). Honestly I may have more sensitive to cold hands and feet, but I can still eat a ton and have energy when doing the IF window...so I have a hard time believing my metabolism actually is down. I think there is something to be said about the cleaning of the gut to improve protein utilization for more muscle...that and periods of short term fasting may increase cell sensitivity to amino acid intake through a protein down regulation. Or maybe it's more improvement in muscle insulin sensitivity that allow more amino acid uptake...or all of the above.
I think you will see plenty of people showing results for IF and mass gain, but they have eating windows of 8 hours and eat a good amount of calories. So it can work....a part of it may also be just a more enjoyable lifestyle factor that makes people more consistent on how they eat as well. (and not feel like a piece of crap all day long...which is how I felt back in the old days of EAS Mass gain shakes and eating all day long)
If IF works for someone....then it works. If IF is not working for someone...then they need to change it up and either modify one of the many variable with an IF plan or get off it completely and just eat all day long until they can fine tune their eating and results. IF doesn't have to be for everyone.