You can thank decades of "finish your plate" and "children in Africa" for leaving millions of people in the West with a heavily skewed idea of what it means to be "full". We've also conditioned people to avoid satiating foods like meats and healthy fats.
Your BMR does not drop when you fast at least not if you are active and have sufficient fat reserves. Starvation mode is mostly a myth.
You can thank decades of "finish your plate" and "children in Africa" for leaving millions of people in the West with a heavily skewed idea of what it means to be "full". We've also conditioned people to avoid satiating foods like meats and healthy fats.