Being a fat adapted roughly can be described as the complete opposite of everything a sugar burner is. A fat burner can effectively burn fat stores for energy.
If you miss one meal and you are able to spend a few hours without feeling hungry as a bear, anxious and desperately wanting some carbs, you are most likely fat adapted.
Fat burner can effectively oxidize dietary fat for energy
If you are “adapted” fat oxidation after a meal will be increased. This in turn will lead to the preservation of less fats in the adipose tissue.
You will have access to much more energy, even if fasting. You will be able to rely on energy from fat while you exercise, which will allow you to store glycogen for moments when you really need it, like extreme trainings, running or climbing. If an athlete is able to mobilize and oxidize stored fat during exercise, it would lower his dependence on glycogen. This is the so-called “train low, race high” effect. If you can make a workout without having to recharge your body with carbohydrates, you are most likely fat adapted.
In addition, you will be able to burn glucose only when you need it, while this is certainly not true for sugar-dependent.
Simply fat adaptation means metabolic flexibility
This means that you can deal with both carbohydrates and fat. You will be able to burn glycogen reserves through an intense workout, to recharge again, to burn any fats that are stored in your body and easily oxidize fats when you need them. You will be able to eat foods high in carbohydrates, without interfering with your metabolism. Once “programmed”, you will be able to seamlessly switch between different “fuels” (glycogen and fat).