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Why fasting helps burn visceral fat first Dr Jamnadas recommends fasting as one of the most effective ways to reverse this process. When you fast, insulin levels drop, allowing your body to switch from using glucose to burning stored fat for fuel. Within about 12 hours, glycogen reserves are depleted, and the body begins mobilising fat, with visceral fat being the first to go. Unlike regular calorie restriction, fasting doesn’t slow down metabolism or cause major muscle loss. Instead, it activates a natural fat-burning state that targets deep abdominal fat, improves insulin sensitivity, and reduces inflammation. He says this is why fasting can be a powerful way to improve heart and metabolic health, especially for those struggling with stubborn belly fat.