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Diet, Nutrition & Weight Loss
Reply to "Another embarrassing question about exercise"
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[quote=Anonymous]No, you are not exhaling fat; you exhale carbon dioxide, which does not have any calories. Fat is used as a source of energy for your body. Wearing a mask should not make any difference. It might in fact make exercise very slightly harder, since you might not get quite as much oxygen with each breath, so you could potentially use a tiny bit more energy.[/quote]
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