Many of us have that strange urge to indulge in certain foods at a certain time. You may find yourself craving for chocolate cake one minute and some ice cream the next. While most people think that these cravings are normal, it gets to a point where you are unable to control these cravings even if you know that too much of those could be detrimental to your health. This could be a sign of sugar addiction according to David Ludwig, author of Ending the Food Fight, and his colleagues at Harvard. Ludwig gives us the 5 signs that we are addicted to sugar.