A sugar - burner (bodies main fuel is glucose) can't easily access fat stores for energy. (mariamindbodyhealth.com)
Since carbs are a teen's main fuel source during physical activity, overweight teens who exercise regularly may need additional carbs to keep up with their bodies» demands, even during weight loss. (healthyeating.sfgate.com)
Carbohydrates are your body's main fuel for energy production. (gymjunkies.com)