Thanks you. Really helpful advice for my first half marathon on Sunday! Started running Jan this year aged 62. I've managed 13.1 slowly in training, so fingers crossed for Peterborough!
This 3-5 day carb loading thing is a bit old hat. The amount of glycogen you have available is a function of what you ate in the last 18-24 hours, not 3-5 days beforehand. Once your glycogen stores are full, any excess cals in the form of carbs etc will be stored as fat. Furthermore, fat doesn't oxidize well (at rest) in the presence of insulin/glucose, so eating loads of carbs for several days beforehand just increases the chance of it being laid down as fat, if your cals are in excess of expenditure.
I'd personally go with smashing the carbs in the day before a race, and not worrying about it at any other time.
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