I'm an active male and I've been having problems with a 18/6 type IF. I do feel better and perform better with a 14/10 type IF, but in that 10 hour window I eat right up to the point of going to sleep. I have seen mixed results which I might attribute to food choice and time of eating around work out (the longer the time from my last meal and my workout the better). Anyone have an opinion or suggestions? I eat strictly primal.