i do not buy this crap for a second....he says to pick a calorie total for a day and eat it all at once
or divide it out, it doesn't matter....
the thing that gets me about "calories in vs calories out" is that people think the human body somehow
waits till the end of the day to total up calories in and subtracts them from cals burned and at that time,
the body decides whether to gain or lose bodymass 
plus the type of calories make a huge difference...a sugar calories is not equal to a protein calorie
yes, this is the biggest mistake int hniking.
you cant eat on a day to day basis..you have to eat accoring to what your body will assimilate and use for the next couple hours.
say two people both eat 300 g protien, 200 g carb, 100 g fat... one person eats it in two meals, the other eats accorign to NEED, spacing it out into 4+ meals... even with the exact same macro nutrient intake, and calorie intake, there will be a HUGE dipsrity in BODY COMPOSITION, (notice i said body composition, not weight)