Birdwatcher,
How many calories do you need to consume a day for a trip like this?
I’m not sure but you feel it pretty quick if you don’t eat, like right away, and when you do eat it’s like it falls into a bottomless pit.
At the end of the day I’ll eat about 30oz of a granola/oatmeal mix with a half gallon of milk and stop the next day for the biggest, greasiest breakfast I can find.
Basically you can eat as much as you want and still lose weight.