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Today I went for a long endurance run, to train up for the brighton marathon. I was running over some steep off road tracks over the Malvern Hills. I had plenty of water, I have been eating properly and had lucosade glucose tablets with me. However after 2 1/2 hours , at around 16 miles, I became really lightheaded and a bit disorientated. I stopped running, got some chocolate milkshake from the shop and went to my mates for a bit to recover. It seemed a bit odd as I have done this kind of distance in the past over the same terrain, could it be down to the glucose tablets? Ive not really used them before. Anyone has any ideas whats going on?