I'm not sure what intermittent fasting is.http://www.leangains.com
has a lot of stuff on it. Dude who writes is from Sweden and basically he is the guy who is pushing this the most. He often reccomends 16 hours of fasting and 8 hours of eating. It's a great thing for people who want to loose weight but have low metabolic rates/NEAT and can only eat around 1200 kcal. Instead of doing the classis thing and "eat every 3 hours" which would mean around 6 meals of 200 kcal you can eat 2 meals of 600 kcal or for the hell of it 1 big meal of 1200 kcal and feel really satisfied instead of walking around half hungry all the time.
I think the main point to take home with this whole new "trend" is that meal frequency/"30 grams of protein every third hour"/etc is bullshit and something that is only pushed by protein powder companies, the old breakfast, lunch and dinner is awesome or the way that you do it BW, follow what your body tells you. The reason I'm doing IF is mostly due to the health benefits that have been found (when comparing isocaloric diets), like better insulin sensitivity for example. I also find it to be a lot easier for my digestive system to eat this way. There is a lot of research on this (mostly done on rats though) and you can find it if you search "intermittent fasting" on pubmed.
When someone says you don't train "functionally," you should just punch them in the face. Ask them how "functional" of a movement that was.