Just a note re increasing fat intake on a bulking phase: if you're eating over maintenance, something along the lines of 85-95% of fat calories you consume will be stored, and not used for energy/etc.
eh sort of/not really. in talking about REPLACING carbs with fat, especially in a high carb load, the fat is STILL less susceptible to being turned into body fat than the excess carbs are, and won't lead to insulin spikes, insulin resistance, fatty liver, etc. biggest problem with replacing the carbs is... it's just tough as shit to eat significant fat/protein past maintenance.. you literally have to force yourself, as opposed to just popping a couple of sodas and getting 175 calories per can.
edit - obviously there is more to it than that still. What kind of fats are we talking (saturated, omega-6, omega-3, etc) how much above maintenance, how many carbs, etc. Still, overall it is better for your body even during bulking the more carbs you replace with fat. Unfortunately that ratio is inversely correlated with how easy it is to bulk. Lower carb, harder to bulk, smaller rise in BF%. Higher carb, easier to bulk, higher rise in BF%. Even that is breaking it down too simply, but isn't the worst rule of thumb.
edit 2 - and obviously genetics. doh. if you are normally extremely insulin sensitive (like many asians, indians, etc) obviously you can handle a much different carb load than say many native southwestern american indians who basically can't handle ANY sort of simple carb load. and such.
