Eating calories in vs out

[Mike T]

So...according to RW "You'll burn roughly 400 to 600 calories per hour during your run, but your body can absorb only 240 to 280 calories per hour "

Does this mean consuming more calories per hour is pointless? Or does a greater calorie intake increase the chances of your body taking in the maximum number of calories?

Clarification? anyone?

If you try to take in more than your limit it will just sit there and eventually come back, or threaten to do so. Some foods, even if not taken in caloric excess, will do the same - you need to find out through trial and error what you can take and how much of it. Of course if the event is not that long you can rely on your glycogen stores backed up with fat burning - for a road marathon the average person uses roughly half of each - more carbs at the start, more fat at the finish. I rarely eat during the shorter ALs, but Ennerdale and Wasdale are different, and I feel the need for extra fuel after halfway. You can run yourself into hypoglycaemia - low blood sugar - which is no fun, and in itself can cause nausea/vomiting.