You need to deplete your glyogen stores first, which is harder if you aren't eating low-carb. Makes for a more difficult transition for your body to switch ove

You need to deplete your glyogen stores first, which is harder if you aren't eating low-carb. Makes for a more difficult transition for your body to switch over into fat-burning mode when it isn't used to it. More sugar cravings, brain fog, etc. Usually the 3-day mark is the standard for when it gets easier if you aren't used to fasting.