well jonathan, everyone is different and you’ll have to do a bit of experimenting to find out what, exactly, works best for you. low glycemic carbs will prevent the dreaded ‘insulin spike’ and adding some protein and healthy fats will also slow the digestion down and give you sustained energy thru your workout…and thru the day!
i disagree with who ever said ‘if you use mainly carbs then it will cause an insulin spike…however protein and fat will give you sustained energy…’ i think it would depend more on what type of carb it was (low or high glycemic) also, people handle carbs differently. some people feel sluggish…like they’re going into an insulin indused coma! don’t forget, carbs fuel your muscles so i believe a pre-workout meal (and diet) consisting of low G.I carbs would be beneficial to a good workout. but like i said, everyone is different, so you’ll need to do some experimenting…there is no ‘best answer’