I'm sure it would if you ate nothing but fat, particularly without any time transitioning from SAD (Standard American Diet). Carbs aren't the enemy, but they're wildly over eaten in SAD, particularly in sedentary people. I carb up every time before I lift, and it helps me quite a bit, but no human ever ever needs to eat grains. We can get low glysemic, high fiber plants like turnips, sweet potato, leafy greens, parsnips. I'm shit at cooking everything I just mentioned but thankfully I have this magic wife. I give her my credit card and magically I have home cooked meals nearly every day. Amazing.