OK, got some time to kill so I think I'll throw out some food thoughts. Estimated base metabolic rate for myself is around 1500+ calories per day. If you use an estimate of 1cal/kg/km for running @ 250 km (MDS distance) and 68 kg (my weight) this adds 17,000 additional calories for the race or about 2,800 a day. Totalling over 4,300 kcal per day.
This assumes total at rest when not running and other unrealistic factors. In fact the BMR would be more like 2,200 or so thus nudging the daily total to around 5,000! That is about 3 lbs of food a day based on approximately 100 kcals/oz or 18-20 lbs for the event. But how does this compare with the factors applied in the Harris-Benedict approach?
Using the BMR and applying the "heavy exercise" factor of 1.9 yields around 2,850 kcals/day, a much smaller number. It is also a much more managble weight -1.8 lbs/day or a little under 11 lbs total. What the truth is it is hard to say. Most likely it is in between these two extremes. But an obvious truth is that nine lbs is nine lbs more to carry.
If the true calloric requirement is on the high end and, one does not want to carry the additional 9 lbs, then you have to make it up. The only place to draw upon then is body stores. Fat is around 3,500 kcal/lb. Assuming then (and there are a lot of assumptions here and in all of this "math") that the higher number is correct, then there is a deficit of around 2,150 kcal/day to make up. This translates to around 2/3 lb of body mass per day or around 3.5 lbs for the entire event. At my current weight of 150 lbs we are talking about 2.5%. That may be acceptable for an event of this magnitude.
Further research and testing is in order.
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