Fat has been painted as the bogey man of the nutrition world.
But high fat in LCHF means that the majority of your calories will come from fat, not necessarily that fat will be high. It can be, but not necessarily.
In fact, Kim Dinis and I logged and compared a typical day in our old diet versus Keto and the amount of fat wasn't that much higher.
Fat has been THE ONE THING to avoid and for that reason the reminder/advice to increase fat is a solid one since it's very likely you are not consuming enough.
Plus when we start keto and while our bodies are not fat adapted (meaning, not efficient at accessing the fat stores) we will feel tired and lack of energy. The body will signal that this would be the time to have a snack, and most people would have been eating every two hours. Again, increasing fat makes you feel less hungry in between meals while signalling the body that this is the fuel it will get.