How To Quit Sugar In 5 Days. You don't need five days to quit sugar. You just need the will to do it. After a while, it becomes second nature. Quitting sugar is the easiest diet in the world. It saves money at the grocery store; because, a quick glance at the labels of most processed food will show that we have been addicted to sugar by some big corporations. They know that eating sugar prompts a cycle of binge eating that is difficult to control. Say what you want about caffeine in coffee. It is a far superior drug to sugar. While sugar substitutes have their own health issues, you will at least not be fat when they hurt you. In my case, quitting sugar three years ago has had only good effect. You can eat a lot of fatty foods, many of which taste great, if you are not building fat with sugar.