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I only found out last week, the brand of energy gel that will be available during my first marathon in a fortnight. I didn't have chance to buy any before my final long run this weekend... so I can't try it out properly.
All advice says NEVER use a gel on race day that you've not tried out in training. But is it really such a big issue?
What consequences could there GENUINELY be? I can imagine some theoretical ones, but I can't see any that are at all likely.
Does anyone have bad experiences?