So let's look at the simplest description of how sugar interferes with weight loss. Once you know it, you can visualize just what's happening in your body and that's a big helpful step--understanding. Certainly we know sugars of all kinds raise blood sugar levels, which is why I never understood the approach to eating multiple meals per day. But the real reason that sugar and weight loss don't mix is that your body uses your sugar sources before it goes to the fat source for energy.
This means, if you are eating refined white flours like pasta and bread and other sugars like cereals and crackers and pastries, etc., your body will continuously go to those sources first for energy because they are easy to access. Once you stop eating refined white flour and sugar, your body will go to your stored fat for energy and will then burn the fat.
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