Does anyone have experience with IF and carb cycling? Is it as healthy as I've read? 16-8 ok or do you have to be more hardcore and do like a 20-4 and sip whey shakes and nuts/berries (i.e. Warrior Diet)?

I've been lifting heavy for a while and have been trying this in order to shed some fat. I'm finding it difficult to get past 13 hours without eating. I get dizzy and shaky.