At the end of the day, you have to actually burn energy to consume calories… unless you fire them out the other end which can be quite unpleasant.
A fast metabolism will allow your body to convert nutrients into energy that your body can use quickly, however you still have to use that energy. There are ways of “artificially boosting” your metabolism but the energy has to go somewhere… So-called fat burners do similar things but at the end of the day you have to burn that energy. Some of these supplements do this by doing things such as increasing your heart-rate… Not something you want to mess with.
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