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question

Do intense activities burn more fat?

National Academy of Sports Medicine
National Academy of Sports Medicine
answer

In a sense, yes, the higher the intensity will elicit more fat loss. It is important to note, however, training at higher intensities will burn other fuels besides fat first. However, because of the higher intensity work, a higher amount of calories will be expended, which results in greater fat loss. 
Fat is the preferred energy source during rest or low level exercise. Unfortunately low level exercise does not burn calories. Thus, fat loss will be negligible. Remember, calories are what matters for fat loss.

Scott Lucett
Scott Lucett on behalf of National Academy of Sports Medicine
Sports Medicine
answer
During high intentsity activities a lower percentage of the calories burnt are from fat. However, the key is not how much "fat" you burn during the activity, but how many CALORIES you burn as fat loss ultimately occurs when one burns more calories than they consume. During lower intensity activites, a higher percentage of the calories you burn are from fat, however you burn a lower number of total calories. The higher the intensity, the lower the percentage of the calories burnt comes from fat, however you burn a higher number of total calories, both during the activity and afterwards (the "afterburn" affect). So if your goal is fat loss, higher intensity activity would be a good option. However, you may need to progress to this type of training based upon your current physical capabilities.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.