Overweight • 27 Eating anything causes insulin to go up. But that's not the worst news. The news that we tend to eat all the time with three meals and two snacks, keeping insulin high all day, is not the worst news. The worst news I have for you is that certain foods cause insulin to skyrocket beyond what your body was designed to accommodate, and this takes hunger to a false level and drives eating beyond what any of us would call normal. It's sugar and flour that make insulin high, super high. Why? Because it is concentrated food. Our The worst news I have for you is that certain foods cause insulin to skyrocket beyond what your body was designed to accommodate, and this takes hunger to a false level and drives eating beyond what any of us would call normal.