Many fitness enthusiasts are often confused about whether they should eat anything before a workout. This is in fact a hotly debated topic. While some say that it is better to work out on an empty stomach if you want to lose weight fast others are not so sure. But advocates of fasted cardio or cardio workouts on an empty stomach say that this is the best strategy to burn fat. The fasted cardio theory was first propagated by Bill Phillips a bodybuilder and author of Body-for-LIFE. He believed that ‘fasting overnight reduces blood sugar insulin levels and glycogen stores.