There is often a lot of talk about marathon carbo-loading. To an extent this is a bit of a myth as you don't need to
eat as much extra food before the race as you might think. Running a marathon will use about 3,000 calories for an average sized
person. This is a lot, but it is not unusual for athletes to load up so much that they will consume up to 10,000 extra calories in
a week when they are doing much less activity than normal.
This will just leave you feeling bloated and heavy as you race - the total opposite of what you might be hoping for.
In fact, it is not unusual for athletes to use less calories in the
week of a marathon, despite the race, because of the light work load in the final few days.
We suggest you make sure you have a good meal, high in carbohydrates, the day before your race, but don't overdo it.
During races it is a good idea to take on fluid (small amounts every 20 minutes or so) and ideally some carbohydrates, whether
this be sports bars, drinks or even (a common aid) jelly beans.