There are two camps about runner foods.
The Keto crowd, they tend to eat nuts.
The rest, eat high carbs foods, think bananas, oats, gummies.
Both of them need a huge amount of fuel. A marathon burns about 2,500 calories from exercise alone, for the average person their TDEE is about 2000. So 4,500 calories a day to break even, without taking into account the heat.
At 4.5K calories, that's 94.5K calories for 3 weeks. The average granola bar is 132 calories, let's pretend he chose a nutrient dense one for 150. That's 630 granola bars. It's not impossible, but not ideal.
You also need to deal with mineral deficiencies for 3 weeks worth of travel. Sodium and Potassium are both needed for intense exercise, which two marathons a day definitely counts.
Like I said, he has as crazy idea, but he is not in touch with reality.
Dehydrated meat would probably be good....now I wonder how he goes to the bathroom.
