So how to burn fat instead of glucose??

The Best Way to Protect Yourself

The best way to get your body to burn fat instead of glucose is to avoid any foods that significantly increase the amount of sugar in your bloodstream. That means staying away from sugars, starches, and other refined carbs.

You see, your body can store only a limited amount of glucose (the sugar that all carbohydrates ultimately break down into) for energy. So when you stop supplying the body with additional glucose (in the form of sugars and other refined carbs), the body has no choice but to start burning fat for energy. And voilà — you’ve shifted from a glucose-burning metabolism to a fat-burning metabolism!