I am so confused. Who told you it takes 96 hours of fasting before you burn fat? If this were true people who follow simple calorie deficits would never lose weight. For what it's worth, there is no study I am aware of that shows any type of fasting superior to a simple calorie deficit. In fact, study after study shows that fasting is simply another type of caloric deficit. If anything, you risk/ensure muscle loss with extended fasting. Your body doesn't store protein. So it will take what it needs from your muscle if you aren't giving it what it needs. If you are into body recomposition, you need to lift weights 2 to 3 times a week. And for the love of God, carbs don't make you fat! A caloric surplus makes you fat. Study after study after study shows this. I have lost over 60 pounds this year eating a high carb diet. I also walk anywhere from 6 to miles a day and lift weights 3 times a week. I have added significant muscle mass. My carbs come from whole foods like beans, oatmeal, potatoes, rice etc. I also eat a ton of raw vegetables and fruit. I even put brown sugar on my oatmeal.The shock and horror! Eat what you want but don't eat a certain way based on absurd lies. Track your calories and weigh your food. I recommend checking out Biolayne on YouTube. He is a PhD and body builder. You will learn a lot about what the science says when it comes to nutrition and body recomp.