you can have something to eat 45 minutes before a workout but it's not going to be digested by then.
the carbs won't all be converted to glucose after 45 min. i don't think.
i get the best results by eating about 60g of complex carbs, a little fruit, and like 6oz of chicken breast or something 3 hours before the workout.
my performance is MUCH better on an empty stomach and no you won't loose the energy from the carbs 3 hours before.
if you eat something 45 min. before your workout, that's good cuz it'll get you anabolic again, but i don't think that will fuel your workout.
that's what i've learned through trial and error.
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