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I'm training for a half marathon at the beginning of october and so far have just been running drinking water as i go but i've noticed that when running my long runs of about 11 miles shortly after i'm getting really bad headaches. I thought this could be down to perhaps that i'm letting my sugar levels get too low or something but i'm not sure. Has anyone else experienced this? or have any advice about how i should be supplementing my running with gels or something on long runs as i'm not sure when i should be starting to use these type of products in my training.