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So I read the articles on Nerd Fitness about working out in a fasted state. It seems to make sense that without as much glucose in your blood from food, your body will turn more quickly to your fat storage for glucose. Then today I came across this thread in the bodybuilding.com forums: http://forum.bodybuilding.com/showthread.php?t=119186991. User Blenderate says about his daily routine, " I kept my carbohydrates low throughout most of the day to keep insulin low, but just before my weightlifting workouts four times per week, I would eat a large serving of fruit and have a glucose/protein/BCAA drink. I would continue sipping the drink throughout my workout, and then finish up with a whey protein isolate shake after I was done. This serves to spike insulin, driving nutrients into the muscles." So, I'm wondering how much truth there is to what this man is saying. Because I know that the only thing that insulin directly affects is the amount of glucose that is taken from your blood into your cells. Would this really have anything to do with the nutrient use by cells? tl/dr: Please compare and contrast the physiology of workouts while fasting and after carb loading.