If I have a high GI shake before I work out, I too feel like shit.
Try something lower in GI about 15/10 mins before. I have a banana and whey in water...works well, I don't crash
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"Focus on making the 5 lifts stronger and getting enough food. There will be plenty of time to worry about glycemic indexes, PERs, and Bulgarian Split squats later. Much later."-Mark Rippetoe
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