If there is insulin present, our body is prevented from burning fat: insulin makes the route to our fat cells a one-way street: things can go in, but nothing can come out. We’re not able to burn any existing reserves until our insulin levels start coming back down about two hours after the spike. But if our glucose levels, and therefore our insulin levels, are steady, we shed pounds. In a 2021 study of 5,600 people, Canadian scientists showed that weight loss is always preceded by insulin decrease.
