How is this accomplished? Remember that various foods supply glucose (sugar), especially carbohydrates. So if your carbohydrate intake is low, you end up with low glycogen stores.
To get the process started begin to taper your intake of carbohydrates for a few days during training, while increasing (healthy) fat intake. Embracing this kind of a diet requires a health professional to guide and monitor you, since very low carbohydrate diets can present certain health challenges. Always check with your physician before beginning an exercise program or a new dietary approach.