FACT: While research shows that exercising in a fasted state allows one to burn more fat, there is inconclusive and little scientific support for a link between fat burning and body fat loss. In fact, exercising in a fasted state may reduce exercise capacity overall and decrease the quality of the workout – and it is possible to experience lightheadedness or dizziness if blood sugar becomes too low during exercise.
“Fat burning” refers to the body’s ability to oxidize (or burn) fat by using fat instead of carbohydrate as a fuel source. Fat burning is often associated with body weight or body fat loss; however, in order for one to lose weight, he must consume fewer calories than he expends consistently over a period of time. This is why exercising in the “fat burning zone,” a lower intensity zone, is often not ideal for reductions in body weight if one is capable of exercising at a higher intensity.
Carbohydrates are important in an individual’s diet because they are the primary fuel for the muscles during exercise (and for the brain all the time!). As exercise intensity increases, the body relies more and more on carbohydrate as a fuel source – so, when you’re exercising at moderate to high intensities (and expending more calories in doing so), your body’s capacity to perform such work is dependent on carbohydrate fuel.” (IDEA Fitness, 3/6/13)
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